Debt-to-Value [Axis] Debt-to-Value [Axis] Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not Previously Recorded Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not Previously Recorded Measurement Input, Credit Spread Measurement Input, Credit Spread [Member] Other Nonoperating Income Other Nonoperating Income Cover [Abstract] Cover [Abstract] Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Schedule of Fair Value Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Cash and Cash Equivalents, Period Increase (Decrease) Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Trading Symbol Trading Symbol Total comprehensive income Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Collateral Received Fixed Maturity Securities [Member] Collateral Received Fixed Maturity Securities [Member] -- None. No documentation exists for this element. -- Carrying Value / Fair Value of Assets Derivative Asset, Fair Value, Gross Asset Derivative Asset, Subject to Master Netting Arrangement, before Offset Non-NEOs Non-NEOs [Member] Schedule of Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table] Schedule of Other than Temporary Impairment, Credit Losses Recognized in Earnings [Table] Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal) Debt Securities, Available-for-Sale, Allowance for Credit Loss, Not to Sell before Recovery, Credit Loss, Previously Recorded, Expense (Reversal) Common Stock, Dividends, Per Share, Declared Common Stock, Dividends, Per Share, Declared Investments Classified By Contractual Maturity Date Investments Classified By Contractual Maturity Date [Text Block] Investments classified by contractual maturity date. Measurement Input, Withdrawal Rate [Member] Measurement Input, Withdrawal Rate [Member] Cash invested in mortgage loans Payments to Acquire Mortgage Notes Receivable Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Assets Sold under Agreements to Repurchase [Line Items] Assets Sold under Agreements to Repurchase [Line Items] Short-term Investments [Member] Short-Term Investments [Member] Purchases of equity securities Payments to Acquire Equity Securities, FV-NI Withdrawals on investment-type policies and contracts Repayments of Annuities and Investment Certificates Gain (Loss) on Sale of Equity Investments Equity Securities, FV-NI, Gain (Loss) Currency Swap [Member] Currency Swap [Member] Organization and Basis of Presentation Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Non-Rule 10b5-1 Arrangement Adopted Non-Rule 10b5-1 Arrangement Adopted [Flag] Hedging Relationship [Domain] Hedging Relationship [Domain] Fair Value Disclosures Fair Value Disclosures [Text Block] Financing Receivable, Allowance for Credit Loss, Foreign Currency Translation Financing Receivable, Allowance for Credit Loss, Foreign Currency Translation Net unrealized investment gains (losses) OCI, Debt Securities, Available-for-Sale, Unrealized Holding Gain (Loss), before Adjustment, after Tax Award Timing Disclosures [Line Items] Other Comprehensive Income (Loss) [Member] Other Comprehensive Income (Loss) [Member] Hotel Hotel [Member] Financial Asset, Aging [Axis] Financial Asset, Aging [Axis] Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change Schedule Of Other Invested Assets [Table Text Block] Schedule Of Other Invested Assets [Table Text Block] Tabular disclosure of the carrying amounts of other invested assets. Financing Receivable, Allowance for Credit Loss [Table Text Block] Financing Receivable, Allowance for Credit Loss [Table Text Block] Cash Collateral for Borrowed Securities Cash Collateral for Borrowed Securities Financing Receivable, Past Due [Table] Financing Receivable, Past Due [Table] Portion at Fair Value Measurement [Member] Portion at Fair Value Measurement [Member] Year Of Origination 2023 Year Of Origination 2023 [Member] Year Of Origination 2023 Policyholder Account Balance, above Guaranteed Minimum Crediting Rate [Axis] Policyholder Account Balance, above Guaranteed Minimum Crediting Rate [Axis] Geographic Distribution [Axis] Geographic Distribution [Axis] Standard Poors AAA To A Minus Ratings [Member] Standard Poors Aaa To Aminus Ratings [Member] -- None. No documentation exists for this element. -- PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeLessThan100Member PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeLessThan100Member [Member] Policyholder Account Balance Guaranteed Minimum Crediting Rate Range Less Than 1.00% Member Unrealized Gains Losses On Available For Sale Securities [Member] Unrealized Gains Losses On Available For Sale Securities [Member] -- None. No documentation exists for this element. -- Net Cash Provided by (Used in) Operating Activities Net Cash Provided by (Used in) Operating Activities Cash Flows from Operating Activities: Net Cash Provided by (Used in) Operating Activities [Abstract] AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax AOCI, Liability for Future Policy Benefit, Expected Future Policy Benefit, before Tax Components of Accumulated Other Comprehensive Income Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block] Award Timing Method Award Timing Method [Text Block] Total Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Trading Arrangements, by Individual Trading Arrangements, by Individual [Table] Common Shares Outstanding Entity Common Stock, Shares Outstanding Insider Trading Policies and Procedures [Line Items] US States and Political Subdivisions Debt Securities [Member] US States and Political Subdivisions Debt Securities [Member] Future Policy Benefits Actual To Expected Variance Future Policy Benefits Actual To Expected Increase Decrease Future Policy Benefits Actual To Expected Increase Decrease Deposits in funds withheld at interest Deposits in (withdrawals from) funds withheld at interest Deposits in (withdrawals from) funds withheld at interest Adjustment to Compensation, Amount Adjustment to Compensation Amount Additional paid-in-capital Additional Paid in Capital, Common Stock Compensation Amount Outstanding Recovery Compensation Amount Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table Aggregate Change in Present Value of Accumulated Benefit for All Pension Plans Reported in Summary Compensation Table [Member] Entity Small Business Entity Small Business Company Selected Measure Amount Company Selected Measure Amount Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net Interest Rate Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net Tabular List, Table Tabular List [Table Text Block] Fair Value Inputs Level 3 Member Fair Value, Inputs, Level 3 [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] Fair Value Measurement Inputs and Valuation Techniques [Table] Fair Value Measurement Inputs and Valuation Techniques [Table] Major Category Of Investments [Domain] Major Category Of Investments [Domain] Major Category Of Investments [Domain] Accrued Income Receivable Accrued Income Receivable [Member] Total Return Swap Total Return Swap [Member] Liability for Claims and Claims Adjustment Expense Liability for Claims and Claims Adjustment Expense Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Market Risk Benefit, Reinsurance Recoverable, after Allowance Market Risk Benefit, Reinsurance Recoverable, after Allowance Policyholder Account Balance After Reinsurance Policyholder Account Balance After Reinsurance Policyholder Account Balance After Reinsurance Stock Repurchase Program, Authorized Amount Share Repurchase Program, Authorized, Amount Debt Securities, Available-for-Sale, Transfer in, Allowance for Credit Loss, Expense Debt Securities, Available-for-Sale, Transfer in, Allowance for Credit Loss, Expense Guaranteed Insurance Contract, Type of Guarantee [Domain] Guaranteed Insurance Contract, Type of Guarantee [Domain] Entity Information [Line Items] Entity Information [Line Items] Employee Stock Option Share-Based Payment Arrangement, Option [Member] Reconciliation of Revenue from Segments to Consolidated [Table] Reconciliation of Revenue from Segments to Consolidated [Table] Schedule of Available-for-sale Securities [Table] Debt Securities, Available-for-Sale [Table] Foreign Currency Forwards Foreign Exchange Forward [Member] Mortgage Loans Classified By Contractual Maturity Date [Table Text Block] Mortgage Loans Classified By Contractual Maturity Date [Table Text Block] Mortgage loans classified by contractual maturity date. Total comprehensive income attributable to RGA, Inc. Comprehensive Income (Loss), Net of Tax, Attributable to Parent Pension Benefits Pension Plan [Member] Allowance for Loan and Lease Losses, Real Estate Allowance for Loan and Lease Losses, Real Estate Balance, Beginning of Period Balance, End of Period Allowance for Loan and Lease Losses, Real Estate Award Type [Axis] Award Type [Axis] Corporate Debt Securities [Member] Corporate Debt Securities [Member] Liability for Future Policy Benefit, Expected Net Premium, Issuance Liability for Future Policy Benefit, Expected Net Premium, Issuance Credit Rating, AM Best [Domain] Credit Rating, AM Best [Domain] Impairment Losses On Debt Securities Available for Sale Impairment Losses On Debt Securities Available for Sale Impairment Losses On Debt Securities Available for Sale Policyholder Account Balance, Guaranteed Minimum Crediting Rate Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Table Text Block] Ceded Credit Risk [Line Items] Ceded Credit Risk [Line Items] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss) Market Risk Benefit, Activity Market Risk Benefit, Activity [Table Text Block] Principal payments of long-term debt Repayments of Debt Total liabilities Liabilities Stockholders' Equity Attributable to Noncontrolling Interest Equity, Attributable to Noncontrolling Interest Fair Value, Option, Quantitative Disclosures [Line Items] Fair Value, Option, Quantitative Disclosures [Line Items] Options exercisable, weighted average price (per share) Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Exercise Price Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] Market Risk Benefit, Increase (Decrease) from Volatility Market Risk Benefit, Increase (Decrease) from Volatility Common stock par value (per share) Common Stock, Par or Stated Value Per Share Gain (Loss), Investment and Derivative, Operating, before Tax Gain (Loss), Investment and Derivative, Operating, before Tax Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-Based Compensation Arrangements by Share-Based Payment Award [Table] Expiration Date Trading Arrangement Expiration Date Cash flows from investing activities Net Cash Provided by (Used in) Investing Activities [Abstract] Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change Liability for Future Policy Benefit, Expected Future Policy Benefit, Increase (Decrease) for Other Change Ceded Credit Risk, Reinsurer [Axis] Reinsurer, Name [Axis] Equity Method Investments, Fair Value Disclosure Equity Method Investments, Fair Value Disclosure Total Shareholder Return Amount Total Shareholder Return Amount Measurement Input Crediting Rate [Member] Measurement Input Crediting Rate [Member] Measurement input using crediting rate. Due after ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 Short-term investments Other Short-Term Investments Equity Awards Adjustments, Footnote Equity Awards Adjustments, Footnote [Text Block] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 Financial Asset, Aging [Domain] Financial Asset, Aging [Domain] Guarantor Obligations [Line Items] Guarantor Obligations [Line Items] Gain on investment activity Debt Securities, Available-for-Sale, Realized Gain Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax Accumulated Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Parent AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, Parent [Member] Line of Credit Facility, Commitment Fee Amount Line of Credit Facility, Commitment Fee Amount Mortgage Loans By Credit Quality Indicator Range Four [Member] Mortgage Loans By Credit Quality Indicator Range Four [Member] Mortgage loans with a loan-to-value ratio of greater than 80%. SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate Schedule [Table] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate Schedule [Table] Debt Instrument [Line Items] Debt Instrument [Line Items] Named Executive Officers, Footnote Named Executive Officers, Footnote [Text Block] Other assets Other Assets Internal Credit Assessment [Domain] Internal Credit Assessment [Domain] Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance Liability for Future Policy Benefit, Expected Future Policy Benefit, Issuance Liability for Future Policy Benefit, Activity [Line Items] Liability for Future Policy Benefit, Activity [Line Items] Policyholder Account Balance, Guaranteed Minimum Crediting Rate Range [Axis] Policyholder Account Balance, Guaranteed Minimum Crediting Rate Range [Axis] Denominator for diluted calculation Weighted Average Number of Shares Outstanding, Diluted Measurement Input, Default Rate Measurement Input, Default Rate [Member] Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected Liability for Future Policy Benefit, Expected Net Premium, Net Premium Collected Schedule of Fair Value, Off-balance Sheet Risks [Table] Fair Value, off-Balance-Sheet Risk [Table] MNPI Disclosure Timed for Compensation Value MNPI Disclosure Timed for Compensation Value [Flag] Due after five years through ten years Mortgage Loans On Real Estate Due After Five Years [Member] Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Net Income (Loss) Available to Common Stockholders, Basic [Abstract] Total RGA, Inc. shareholders’ equity Stockholders' Equity Attributable to Parent Equity, Attributable to Parent Insurance Claims [Member] Insurance Claims [Member] Treasury stock, at cost – 19,219,071 and 19,438,336 shares Treasury Stock, Value Derivative Liability, Measurement Input Derivative Liability, Measurement Input Due in one year or less Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives This item represents the amount recognized in investment related gains (losses) related to the change in the fair value of derivatives, excluding embedded derivatives. Foreign Exchange Option Foreign Exchange Option [Member] Life Insurance Product Line [Member] Life Insurance Product Line [Member] Commitment Period Two Thousand Thirty Seven Commitment Period Two Thousand Thirty Seven [Member] Commitment Period Two Thousand Thirty Seven Securities or Other Assets Sold under Agreements to Repurchase, Maturity Periods [Axis] Repurchase Agreements and Similar Transactions, Maturity Periods [Axis] Type of Adoption [Domain] Accounting Standards Update [Domain] Maturity over 90 days [Member] Maturity Greater than 90 Days [Member] Fixed Maturity Holdings Industry Types Weighted Average Credit Ratings [Table Text Block] Investment Holdings, Schedule of Investments [Table Text Block] Asset and mortgage-backed securities Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Amortized Cost Commitment Period Two Thousand Thirty Five [Member] Commitment Period Two Thousand Thirty Five [Member] Commitment Period Two Thousand Thirty Five [Member] Investment Narrative [Table] Investment Narrative [Table] Market Risk Benefit, Increase (Decrease) from Other Assumption Market Risk Benefit, Increase (Decrease) from Other Assumption Policyholder Account Balance [Table] Policyholder Account Balance [Table] AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax AOCI, Liability for Future Policy Benefit, Expected Net Premium, before Tax Foreign currency translation adjustments Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Gain (Loss) Arising During Period, Net of Tax Exchange [Domain] Exchange [Domain] Document Fiscal Period Focus Document Fiscal Period Focus All Executive Categories All Executive Categories [Member] Equivalent shares from outstanding stock awards Incremental Common Shares Attributable to Dilutive Effect of Share-Based Payment Arrangements Securities Financing Transaction [Table] Security Financing Transaction [Table] Equity securities Equity Securities [Member] Accumulated Net Unrealized Investment Gain (Loss) [Member] AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-Sale, Parent [Member] Changed Peer Group, Footnote Changed Peer Group, Footnote [Text Block] Assets Assets [Abstract] Retirement Plan Type [Domain] Retirement Plan Type [Domain] Total other comprehensive income (loss), net of tax Other Comprehensive Income (Loss), Net of Tax Other Comprehensive Income (Loss), Net of Tax Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items] Document Type Document Type Line of Credit Facility, Commitment Fee Percentage Line of Credit Facility, Commitment Fee Percentage Derivative Contract [Domain] Derivative Contract [Domain] Policyholder Account Balance, Surrender and Withdrawal Policyholder Account Balance, Surrender and Withdrawal Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change Liability for Future Policy Benefit, Expected Net Premium, Original Discount Rate, before Reinsurance, after Cash Flow Change Stock Based Compensation Shares Stock Based Compensation Shares This item represents net shares issued from treasury pursuant to the Company's stock-based compensation program. Options, remaining term Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Mortgage loans (net of allowance for credit losses of $107 and $93) Mortgage loans on real estate (net of valuation allowances) Mortgage Loans on Real Estate, Commercial and Consumer, Net Schedule of Defined Benefit Plans Disclosures [Table] Defined Benefit Plan [Table] Other policy claims and benefits Liability for Unpaid Claims and Claims Adjustment Expense, Net Available for Sale at Fair value - Amortized cost Total Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost Financial Asset, 60 to 89 Days Past Due Financial Asset, 60 to 89 Days Past Due [Member] Maximum [Member] Maximum [Member] Policyholder Account Balance, Net Amount at Risk Policyholder Account Balance, Net Amount at Risk Equity Valuation Assumption Difference, Footnote Equity Valuation Assumption Difference, Footnote [Text Block] Mortgage Loan Maturity [Domain] Mortgage Loan Maturity [Domain] Other Non Operating Reconciling Items Other Non Operating Reconciling Items Other Non Operating Reconciling Items Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Schedule of Liability for Unpaid Claims and Claims Adjustment Expense [Table Text Block] Investment Type [Axis] Investment Type [Axis] Deferred Policy Acquisition Costs Deferred Policy Acquisition Costs [Text Block] Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI Equity Release Mortgages [Member] Equity Release Mortgages [Member] Equity Release Mortgages [Member] Offsetting Liabilities [Table Text Block] Offsetting Liabilities [Table Text Block] Accrued investment income Accrued Investment Income Receivable Statistical Measurement [Axis] Statistical Measurement [Axis] Interest credited Interest credited Policyholder Account Balance, Interest Expense Non-Rule 10b5-1 Arrangement Terminated Non-Rule 10b5-1 Arrangement Terminated [Flag]  Income before income taxes Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest Non-PEO NEO Average Total Compensation Amount Non-PEO NEO Average Total Compensation Amount Market Risk Benefit, Interest Expense Market Risk Benefit, Interest Expense Provision (release) Allowance For Loan And Lease Losses Writeoff Net Of Recoveries Allowance For Loan And Lease Losses Writeoff Net Of Recoveries Name Outstanding Recovery, Individual Name Schedule Of Earnings Per Share Basic And Diluted By Common Class [Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Canadian Province Of Ontario Securities [Member] Canadian Province Of Ontario Securities [Member] Award Timing Predetermined Award Timing Predetermined [Flag] Major Categories Of Investments [Domain] Major Categories Of Investments [Domain] Partnership Interest Partnership Interest [Member] Available For Sale Securities [Domain] Available For Sale Securities [Domain] Entity Listings, Exchange [Axis] Entity Listings, Exchange [Axis] Amortization of prior service cost Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Diluted earnings per share Earnings Per Share, Diluted Liability for Future Policy Benefits and Unpaid Claims Disclosure Liability for Future Policy Benefits and Unpaid Claims Disclosure [Text Block] Restatement does not require Recovery Restatement Does Not Require Recovery [Text Block] Other commercial Other Property [Member] Retirement Benefits [Abstract] Retirement Benefits [Abstract] Commitment Period Two Thousand Forty Nine Commitment Period Two Thousand Forty Nine [Member] Commitment Period Two Thousand Forty Nine Customer [Axis] Customer [Axis] Rating Agency [Domain] External Credit Rating, Standard & Poor's [Domain] Statement of Financial Position [Abstract] Statement of Financial Position [Abstract] Asset-backed Securities [Member] Asset-Backed Securities [Member] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings Derivative Liability, Subject to Master Netting Arrangement, after Offset Derivative Liability, Subject to Master Netting Arrangement, after Offset Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Derivative Asset, Subject to Master Netting Arrangement, Collateral, Obligation to Return Security Not Offset Limited Partnership Classification Axis [Domain] Limited Partnership Classification Axis [Domain] Limited Partnership Classification Axis [Domain] RZA [Member] RZA [Member] Reinsurance Group of America Fixed to Floating Subordinated Debentures Ticker RZA Unrecognized Tax Benefits, Period Increase (Decrease) Unrecognized Tax Benefits, Period Increase (Decrease) Investment related gains (losses), net Gain (Loss) on Sale of Other Investments Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Guarantor Obligations, Nature [Domain] Guarantor Obligations, Nature [Domain] Equity Method Investments Equity Method Investments [Member] Provision for income taxes Income Tax Expense (Benefit) Income Tax Expense (Benefit) Income Tax Expense (Benefit) Interest cost Defined Benefit Plan, Interest Cost Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] Notional Amount Derivative, Notional Amount Derivative Asset Derivative Asset Policyholder Account Balance, at Guaranteed Minimum Crediting Rate Policyholder Account Balance, at Guaranteed Minimum Crediting Rate [Member] Claims Recoverable From Retrocessionaires Past Due Claims Recoverable From Retrocessionaires Past Due Represents the amount of claims paid by the company and recoverable from retrocessionaires which is contractually past due in excess of 90 days. Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition Real Estate Held For Sale Transferred To Held For Use Real Estate Held For Sale Transferred To Held For Use Real Estate Held For Sale Transferred To Held For Use Commitment Period Two Thousand Thirty Six [Member] Commitment Period Two Thousand Thirty Six [Member] Commitment Period Two Thousand Thirty Six [Member] PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0100To0199Member PolicyholderAccountBalanceGuaranteedMinimumCreditingRateRangeFrom0100To0199Member [Member] Policyholder Account Balance Guaranteed Minimum Crediting Rate Range From 0.100 To 0.199 Member Statement of Comprehensive Income [Abstract] Statement of Comprehensive Income [Abstract] Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Interest expense Interest Expense, Operating and Nonoperating Net Liability For Future Policy Benefits At Original Discount Rate Net Liability For Future Policy Benefits At Original Discount Rate Net Liability For Future Policy Benefits At Original Discount Rate All Adjustments to Compensation All Adjustments to Compensation [Member] Measurement Input, EBITDA Multiple [Member] Measurement Input, EBITDA Multiple [Member] Credit Default Subtotal [Member] Credit Default Subtotal [Member] -- None. No documentation exists for this element. -- Guarantor Obligations, Maximum Exposure, Undiscounted Guarantor Obligations, Maximum Exposure, Undiscounted Derivatives Non Hedging Instruments [Axis] Derivatives Non Hedging Instruments [Axis] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items] Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items] Fair Value, off-Balance-Sheet Risks, Disclosure Information [Line Items] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Consumer Price Index Swap [Member] Consumer Price Index Swap [Member] Consumer Price Index Swaps Legal Entity [Axis] Legal Entity [Axis] Line of Credit Facility, Priority Line of Credit Facility, Priority Liability for Future Policy Benefit, Activity Liability for Future Policy Benefit, Activity [Table Text Block] Changes In Cash Flow Assumptions Changes In Cash Flow Assumptions Changes In Cash Flow Assumptions Securities Borrowed Securities Borrowed Scenario [Domain] Scenario [Domain] Year of Origination [Axis] Year of Origination [Axis] Year of Origination [Axis] Subordinated Debentures due 2055 Subordinated Debentures due 2055 [Member] Subordinated Debentures due 2055 US Government Agencies Debt Securities [Member] US Government Agencies Debt Securities [Member] Long-Term Debt, Type [Domain] Long-Term Debt, Type [Domain] Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance Liability for Future Policy Benefit, Expected Future Gross Premium, Undiscounted, before Reinsurance Entity Address, State or Province Entity Address, State or Province Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Erroneous Compensation Analysis Erroneous Compensation Analysis [Text Block] Credit Default Types [Axis] Credit Default Types [Axis] -- None. No documentation exists for this element. -- Defined Benefit Plan Disclosure [Line Items] Defined Benefit Plan Disclosure [Line Items] Deferred Policy Acquisition Cost, Capitalization Deferred Policy Acquisition Cost, Capitalization Non Hedging Instruments [Domain] Non Hedging Instruments [Domain] Equity, Class of Treasury Stock [Line Items] Equity, Class of Treasury Stock [Line Items] Prior service cost Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax Financial Instruments [Domain] Financial Instruments [Domain] High Investment Grade [Member] High Investment Grade [Member] High Investment Grade Internal Credit Quality Grade Liabilities and equity Liabilities and Equity [Abstract] RZB [Member] RZB [Member] Reinsurance Group of America Fixed to Floating Subordinated Debentures Ticker RZB Other than Temporary Impairment Losses, Investments, Portion Recognized in Earnings, Net Debt Securities, Available-for-Sale, Allowance for Credit Loss, Period Increase (Decrease) Market Risk Benefit, Liability, Amount Market Risk Benefit, Liability, Amount Other liabilities Other Liabilities, Fair Value Disclosure Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) of Actual Variance from Expected Experience Restatement Determination Date Restatement Determination Date Derivatives Derivative [Member] Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral Derivative Asset, Subject to Master Netting Arrangement, before Offset of Collateral Estimate of Fair Value Measurement [Member] Estimate of Fair Value Measurement [Member] Policyholder Account Balance, Policy Charge Policyholder Account Balance, Policy Charge Net investment income Investment income, net of related expenses Net Investment Income Pay vs Performance Disclosure Pay vs Performance Disclosure [Table] Interest Rate Contract Interest Rate Contract [Member] Erroneously Awarded Compensation Recovery Erroneously Awarded Compensation Recovery [Table] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Bank Loans [Member] Bank Loan Obligations [Member] Liability for Unpaid Claims and Claims Adjustment Expense Other Liability for Unpaid Claims and Claims Adjustment Expense Other Liability for Unpaid Claims and Claims Adjustment Expense Total Other Adjustments Year Of Origination Prior Periods [Member] Year Of Origination Prior Periods [Member] Year Of Origination for all financial statement items more than 5 years prior to the current period. Year Of Origination 2024 Year Of Origination 2024 [Member] Year Of Origination 2024 CALIFORNIA CALIFORNIA Financial Liabilities Fair Value Disclosure Financial Liabilities Fair Value Disclosure Earnings Per Share Earnings Per Share [Text Block] Limited Partnership Cost Method Limited Partnership Cost Method [Member] Limited Partnership Cost Method Future Policy Benefits Unearned Revenue Liability Future Policy Benefits Unearned Revenue Liability Future Policy Benefits Unearned Revenue Liability Investment related gains (losses), net Total investment related gains (losses), net Gain (Loss) on Investments Peer Group Issuers, Footnote Peer Group Issuers, Footnote [Text Block] Other revenues Other Income Segments [Domain] Segments [Domain] Other Comprehensive Income (Loss), Tax Other Comprehensive Income (Loss), Tax Schedule of Repurchase Agreements [Table Text Block] Schedule of Repurchase Agreements [Table Text Block] Canadian Province Of Quebec Securities [Member] Canadian Province Of Quebec Securities [Member] PEO PEO [Member] Real Estate [Line Items] Real Estate [Line Items] Cumulative Foreign Currency Translation Gain Loss Recorded In Accumulated Other Comprehensive Income Loss For Terminated Net Investment In Foreign Operations Hedges Cumulative Foreign Currency Translation Gain Loss Recorded In Accumulated Other Comprehensive Income Loss For Terminated Net Investment In Foreign Operations Hedges Cumulative foreign currency translation gain (loss) recorded in accumulated other comprehensive income (loss) related to hedges of net investments in foreign operations which have been terminated. Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items] Name Trading Arrangement, Individual Name Premiums receivable and other reinsurance balances Premiums and Other Receivables, Net Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table] Other Commitments [Table Text Block] Other Commitments [Table Text Block] Securities Financing Transaction [Line Items] Securities Financing Transaction [Line Items] Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Line of Credit Facility, Unused Capacity, Commitment Fee Percentage Purchase of treasury stock Payments for Repurchase of Equity Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Noncontrolling Interest Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) Hedged Liability, Fair Value Hedge, Cumulative Increase (Decrease) Awards Close in Time to MNPI Disclosures, Table Awards Close in Time to MNPI Disclosures [Table Text Block] Policyholder Account Balance Reinsurance Recoverable Policyholder Account Balance Reinsurance Recoverable Policyholder Account Balance Reinsurance Recoverable Transfer to Investments Transfer to Investments Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year Prior Year End Fair Value of Equity Awards Granted in Any Prior Year that Fail to Meet Applicable Vesting Conditions During Covered Year [Member] Reinsurance Recoverables, Including Reinsurance Premium Paid Reinsurance Recoverables, Including Reinsurance Premium Paid Cash and cash equivalents Cash and Cash Equivalents, Fair Value Disclosure AOCI, Liability for Future Policy Benefit, after Tax AOCI, Liability for Future Policy Benefit, after Tax Aggregate Erroneous Compensation Amount Aggregate Erroneous Compensation Amount Local Phone Number Local Phone Number Financial Instruments Carrying Amounts And Estimated Fair Value [Table Text Block] Financial Instruments Carrying Amounts And Estimated Fair Value [Table Text Block] Carrying amounts and estimated fair value of financial instruments. Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 Market Risk Benefit, Asset, Amount Market Risk Benefit, Asset, Amount Commitment Period Two Thousand Thirty Eight Commitment Period Two Thousand Thirty Eight [Member] Commitment Period Two Thousand Thirty Eight Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense Aggregate Erroneous Compensation Not Yet Determined Aggregate Erroneous Compensation Not Yet Determined [Text Block] Schedule Of Corporate Securities by Major Industry And Credit Rating [Table] Schedule Of Corporate Securities by Major Industry And Credit Rating [Table] -- None. No documentation exists for this element. -- Commitment Period Two Thousand Thirty Nine Commitment Period Two Thousand Thirty Nine [Member] Commitment Period Two Thousand Thirty Nine Americas [Member] Americas [Member] Liability for Future Policy Benefit, Current Weighted-Average Discount Rate Liability for Future Policy Benefit, Current Weighted-Average Discount Rate Debt Securities, Available-for-Sale, Allowance for Credit Loss Debt Securities, Available-for-Sale, Allowance for Credit Loss Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block] Schedule of Fair Value, off-Balance-Sheet Risks [Table Text Block] PEO Total Compensation Amount PEO Total Compensation Amount Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] Interest Income [Member] Interest Income [Member] Derivative Liability, Fair Value, Gross Liability Derivative Liability, Subject to Master Netting Arrangement, before Offset Maximum Potential Future Exposure on Credit Risk Derivatives Credit Derivative, Maximum Exposure, Undiscounted Income Statement Location [Axis] Statement of Income Location, Balance [Axis] Limited Partnership And Joint Ventures Table Text Block Limited Partnership And Joint Ventures Table Text Block [Table Text Block] Limited Partnership And Joint Ventures Table Text Block Deposits on investment-type policies and contracts Proceeds from Annuities and Investment Certificates Debt Disclosure [Abstract] Common Stock [Member] Common Stock [Member] Forgone Recovery due to Expense of Enforcement, Amount Forgone Recovery due to Expense of Enforcement, Amount Segment Reporting [Abstract] Segment Reporting [Abstract] Funds withheld at interest embedded derivatives Fair Value Measured On Recurring Basis Funds Held Under Reinsurance Agreements Asset Embedded Derivatives Embedded derivatives related to funds held by the ceding insurer on behalf the reinsurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder, which represent an asset for the reinsurer. There is another concept for the corresponding liability of the ceding insurer. Liability for Future Policy Benefit, Interest Expense Liability for Future Policy Benefit, Interest Expense Entity central index key Entity Central Index Key Real Estate Loans On A Nonaccrual Status Real Estate Loans On A Nonaccrual Status Real Estate Loans On A Nonaccrual Status Scenario [Axis] Scenario [Axis] Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change Liability for Future Policy Benefit, Expected Net Premium, before Reinsurance, after Discount Rate Change Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims Accumulated Translation Adjustment [Member] Accumulated Foreign Currency Adjustment Attributable to Parent [Member] Year Of Origination 2022 Year Of Origination 2022 [Member] Year Of Origination 2022 Non-PEO NEO Average Compensation Actually Paid Amount Non-PEO NEO Average Compensation Actually Paid Amount Ceded Credit Risk, Reinsurer [Domain] Reinsurer, Name [Domain] Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected Market Risk Benefit, Increase (Decrease) from Actual Policyholder Behavior Different from Expected Funds Held under Reinsurance Agreements, Liability Funds Held under Reinsurance Agreements, Liability Funds Held under Reinsurance Agreements, Liability Stockholders' Equity Note Disclosure [Text Block] Equity [Text Block] Award Timing, How MNPI Considered Award Timing, How MNPI Considered [Text Block] Financial Instrument [Axis] Financial Instrument [Axis] Change in other invested assets Payments for (Proceeds from) Productive Assets Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives Fair Value Measured On Recurring Basis Guaranteed Interest Contracts Embedded Derivatives Fair Value, Liabilities Measured on Recurring Basis, Interest-sensitive contract liabilities - embedded derivatives. Segment Information Segment Reporting Disclosure [Text Block] Derivative Asset, Subject to Master Netting Arrangement, after Offset and Deduction Derivative Asset, Subject to Master Netting Arrangement, after Offset and Deduction Obligation to Return Securities Received as Collateral Obligation to Return Securities Received as Collateral Purchases of limited partnerships and real estate joint ventures Payments to Acquire Real Estate and Real Estate Joint Ventures Market Risk Benefit, Increase (Decrease) from Equity Market Change Market Risk Benefit, Increase (Decrease) from Equity Market Change Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings Average Investment Grade [Member] Average Investment Grade [Member] Average Investment Grade Internal Credit Quality Grade Major Categories Of Investments [Axis] Major Categories Of Investments [Axis] Measurement Basis [Axis] Measurement Basis [Axis] Major Category Of Investments [Axis] Major Category Of Investments [Axis] Major Category Of Investments Title Trading Arrangement, Individual Title Collateral Fixed Maturity Securities [Member] Collateral Fixed Maturity Securities [Member] Comprehensive income attributable to noncontrolling interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets [Table Text Block] Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets [Table Text Block] City Area Code City Area Code Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] Industrial Industrial Property [Member] Deferred Policy Acquisition Cost [Line Items] Deferred Policy Acquisition Cost [Line Items] Office building Office Building [Member] Percentage of total Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total The amount represents the total percentage of each property type in comparison to the total of mortgage loans whose balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio. Insider Trading Policies and Procedures Not Adopted Insider Trading Policies and Procedures Not Adopted [Text Block] Purchases of short-term investments Payments to Acquire Short-Term Investments Stockholders' Equity Note [Abstract] Stockholders' Equity Note [Abstract] Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change Line of Credit Facility, Description Line of Credit Facility, Description Investment Income Investment Income [Table Text Block] Document Information [Line Items] Document Information [Line Items] Derivative Asset, Measurement Input Derivative Asset, Measurement Input Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements [Member] Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements Investment Related Gains Losses [Member] Investment Related Gains Losses [Member] Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Fair Value Measurement Inputs and Valuation Techniques [Table Text Block] Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums Unamortized Loan Commitment and Origination Fees and Unamortized Discounts or Premiums Investment Investment [Text Block] Earnings per share Earnings Per Share [Abstract] Equity [Abstract] Equity [Abstract] Debt Service Coverage Ratio By Range [Axis] Debt Service Coverage Ratio By Range [Axis] Debt Service Coverage Ratio By Range [Axis] Benefits and expenses Benefits, Losses and Expenses [Abstract] Available For Sale Securities Debt Maturities Fair Value Debt Securities, Available-for-Sale, Fair Value, Fiscal Year Maturity [Abstract] Retained earnings Retained Earnings (Accumulated Deficit) Reclassification Out Of Accumulated Other Comprehensive Income Reclassification out of Accumulated Other Comprehensive Income [Table Text Block] Class of Stock [Domain] Class of Stock [Domain] Embedded Derivative, Gain on Embedded Derivative Embedded Derivative, Gain on Embedded Derivative Commitment Period Two Thousand Forty Six Commitment Period Two Thousand Forty Six [Member] Commitment Period Two Thousand Forty Six External Credit Rating by Grouping [Axis] External Credit Rating by Grouping [Axis] External Credit Rating by Grouping [Axis] Debt Security, Government, Non-US [Member] Debt Security, Government, Non-US [Member] Aggregate Available Trading Arrangement, Securities Aggregate Available Amount Net Accounting Standards Not Yet Adopted New Accounting Standards Not Yet Adopted [Text Block] New Accounting Standards Not Yet Adopted Equity Awards Adjustments Equity Awards Adjustments [Member] Other Invested Assets [Axis] Other Invested Assets [Axis] % of Total Percentage Of Total Available For Sale Securities Percentage of available for sale securities Liability for Future Policy Benefit, Expected Net Premium, Derecognition Liability for Future Policy Benefit, Expected Net Premium, Derecognition Market Risk Benefits Market Risk Benefits [Text Block] Market Risk Benefits entire disclosure Underlying Securities Award Underlying Securities Amount Performance Shares Performance Shares [Member] Dividends, Common Stock, Cash Dividends, Common Stock, Cash Year Of Origination 2021 Year Of Origination 2021 [Member] Year Of Origination 2021 Amendment flag Amendment Flag Reported Value Measurement [Member] Reported Value Measurement [Member] Mortgage Loan Maturity [Axis] Mortgage Loan Maturity [Axis] Impact Of Updating Discount Rate Recognized In OCI Increase Decrease Impact Of Updating Discount Rate Recognized In OCI Increase Decrease Impact Of Updating Discount Rate Recognized In OCI Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax Stock Appreciation Rights (SARs) Stock Appreciation Rights (SARs) [Member] Securities Loaned, Fair Value of Collateral Securities Loaned, Fair Value of Collateral Share Repurchase Program [Member] Share Repurchase Program [Member] Shares and Amounts purchased under RGA's current Share Repurchase Program [Member] Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0400 and Greater [Member] Commercial Loan [Member] Commercial Loan [Member] Debt Instrument, Measurement Input Debt Instrument, Measurement Input Deferred Policy Acquisition Cost [Table] Deferred Policy Acquisition Cost [Table] Due in one year or less Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One Debt Disclosure Debt Disclosure [Text Block] Fair Value Hierarchy and NAV [Domain] Fair Value Hierarchy and NAV [Domain] Recovery of Erroneously Awarded Compensation Disclosure [Line Items] Debt Instrument, Face Amount Debt Instrument, Face Amount Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements Entity Address, Postal Zip Code Entity Address, Postal Zip Code Funds Withheld At Interest Embedded Derivatives [Member] Funds Withheld At Interest Embedded Derivatives [Member] This category includes information about funds withheld at interest - embedded derivatives. Interest Rate Swaps Interest Rate Swap [Member] Market Risk Benefit, Benefit Payment Market Risk Benefit, Benefit Payment Interest Rate Options [Member] Interest Rate Options [Member] Interest Rate Option Undiscounted and Discounted Future Gross Premiums and Expected Future Benefits Undiscounted and Discounted Future Gross Premiums and Expected Future Benefits [Table Text Block] Undiscounted and Discounted Future Gross Premiums and Expected Future Benefits Deferred Policy Acquisition Costs, Foreign Currency Translation Gain (Loss) Deferred Policy Acquisition Costs, Foreign Currency Translation Gain (Loss) Real Estate Acquired Through Foreclosure Real Estate Acquired Through Foreclosure Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) Fair Value, Liability, Recurring Basis, Still Held, Unrealized Gain (Loss) Other, net Payments for (Proceeds from) Other Investing Activities AOCI Components [Axis] AOCI Components [Axis] -- None. No documentation exists for this element. -- Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested Year-over-Year Change in Fair Value of Equity Awards Granted in Prior Years That are Outstanding and Unvested [Member] Corporate Joint Venture Corporate Joint Venture [Member] Document [Domain] Document [Domain] Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested Year-end Fair Value of Equity Awards Granted in Covered Year that are Outstanding and Unvested [Member] Derivative, Amount of Hedged Item Derivative, Amount of Hedged Item Fair Value Measurement [Domain] Fair Value Measurement [Domain] Disclosure Of Real Estate Holdings By Property Type [Table Text Block] Disclosure Of Real Estate Holdings By Property Type [Table Text Block] This table presents information on how the Company diversifies its real estate holdings by property type to reduce the risk of concentration. Maturity 30 to 90 Days [Member] Maturity 30 to 90 Days [Member] Disclosure Of Credit Derivatives Disclosure of Credit Derivatives [Table Text Block] Adjustment To PEO Compensation, Footnote Adjustment To PEO Compensation, Footnote [Text Block] Standard Poors BBB Rating [Member] Standard & Poor's, BBB Rating [Member] Equity Option Equity Option [Member] Derivative Assets [Abstract] Derivative Asset [Abstract] Designated As Hedging Instrument Designated as Hedging Instrument [Member] SEC Schedule, 12-17, Insurance Companies, Reinsurance [Abstract] Valuation, Market Approach [Member] Valuation, Market Approach [Member] Compensation Actually Paid vs. Other Measure Compensation Actually Paid vs. Other Measure [Text Block] Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value Debt Securities, Available-for-Sale, Unrealized Loss Position, Fair Value [Table Text Block] Schedule of Stock by Class [Table] Stock, Class of Stock [Table] Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year Vesting Date Fair Value of Equity Awards Granted and Vested in Covered Year [Member] Shares: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Total assets Assets Assets Interest Rate Future Interest Rate Future [Member] Interest Rate Future Schedule of Guarantor Obligations [Table] Guarantor Obligation [Table] Financing Receivable, Modified in Period, Amount Financing Receivable, Modified in Period, Amount Policyholder Account Balance Policyholder Account Balance [Table Text Block] Forgone Recovery due to Violation of Home Country Law, Amount Forgone Recovery due to Violation of Home Country Law, Amount Commitments and contingent liabilities (See Note 15) Commitments and Contingencies Liability for Future Policy Benefit, after Reinsurance Liability for Future Policy Benefit, after Reinsurance AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax AOCI, Debt Securities, Available-for-Sale, Adjustment, after Tax Termination Date Trading Arrangement Termination Date Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment Liability for Future Policy Benefit, Expected Future Policy Benefit, Benefit Payment Long-Duration Insurance Contracts Disclosure Long-Duration Insurance Contracts Disclosure [Text Block] Other liabilities Other Liabilities Not Designated as Hedging Instrument Not Designated as Hedging Instrument [Member] Due after one year through five years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five Debt Instrument [Axis] Debt Instrument [Axis] Maturities of short-term investments Proceeds from Maturities, Prepayments and Calls of Short-Term Investments Available For Sale Securities [Axis] Available For Sale Securities [Axis] Market Risk Benefit [Line Items] Market Risk Benefit [Line Items] Other reinsurance balances Reinsurance Payable Net income Net income Net income (numerator for basic and diluted calculations) Net Income (Loss) Attributable to Parent Trading Arrangement: Trading Arrangement [Axis] Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change Market Risk Benefit, before Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense Liability for Future Policy Benefit, Expected Future Policy Benefit, Interest Expense Pay vs Performance Disclosure, Table Pay vs Performance [Table Text Block] Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward] Credit Default Swaps Referencing Indices [Member] Credit Default Swaps Referencing Indices [Member] -- None. No documentation exists for this element. -- Offsetting Assets [Table Text Block] Offsetting Assets [Table Text Block] Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change Liability for Future Policy Benefit, Expected Net Premium, Cumulative Increase (Decrease) from Cash Flow Change Equity Awards Adjustments, Excluding Value Reported in Compensation Table Equity Awards Adjustments, Excluding Value Reported in the Compensation Table [Member] Available-for-sale Securities [Member] Available-for-Sale Securities [Member] Due after ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) Hedged Liability, Discontinued Fair Value Hedge, Cumulative Increase (Decrease) Total benefits and expenses Benefits, Losses and Expenses Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change Market Risk Benefit, after Reinsurance and Cumulative Increase (Decrease) from Instrument-Specific Credit Risk Change Entity File Number Entity File Number FinancialAssetsSoldUnderAgreementsToRepurchaseGrossIncludingNotSubjectToMasterNettingArrangement Financial Assets Sold under Agreements to Repurchase, Gross Including Not Subject to Master Netting Arrangement Other Nonoperating Expense Other Nonoperating Expense Income Statement [Abstract] Income Statement [Abstract] Entity Address, Address Line One Entity Address, Address Line One Debt Security Category [Axis] Debt Security Category [Axis] Effect of exchange rate changes on cash Effect of Exchange Rate on Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents, Continuing Operations Measurement Input, Mortality Rate [Member] Measurement Input, Mortality Rate [Member] Name Forgone Recovery, Individual Name Year Of Origination 2025 Year Of Origination 2025 [Member] Year Of Origination 2025 Recorded Investment Real Estate Loans Award Timing MNPI Considered Award Timing MNPI Considered [Flag] Asset and mortgage-backed securities Debt Securities, Available-for-Sale, Maturity, without Single Maturity Date, Fair Value Additional Liability, Long-Duration Insurance, before Reinsurance, after Discount Rate Change Additional Liability, Long-Duration Insurance, before Reinsurance, after Discount Rate Change Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0051 to 0150 [Member] Liability For Future Policy Benefits Cumulative Amount Of Fair Value Hedging Adjustments Liability For Future Policy Benefits Cumulative Amount Of Fair Value Hedging Adjustments Liability For Future Policy Benefits Cumulative Amount Of Fair Value Hedging Adjustments Liability For Unpaid Claims And Claims Adjustment Expense Net Of Recoverable Liability For Unpaid Claims And Claims Adjustment Expense Net Of Recoverable Liability as of the balance sheet date for amounts representing estimated cost of settling unpaid claims under the terms of the underlying insurance policies, less estimated reinsurance recoveries on such claims. This includes an estimate for claims which have been incurred but not reported. Claim adjustment expenses represent the costs estimated to be incurred in the settlement of unpaid claims. Outstanding Aggregate Erroneous Compensation Amount Outstanding Aggregate Erroneous Compensation Amount Schedule of Stock by Class [Table Text Block] Schedule of Stock by Class [Table Text Block] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0200 to 0299 Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0200 to 0299 [Member] PEO Actually Paid Compensation Amount PEO Actually Paid Compensation Amount Commitment Period Two Thousand Forty One Commitment Period Two Thousand Forty One [Member] Commitment Period Two Thousand Forty One Measurement Input, Counterparty Credit Risk [Member] Measurement Input, Counterparty Credit Risk [Member] Adjustment to Compensation: Adjustment to Compensation [Axis] Net Income (Loss) Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Noncontrolling Interest Derivative Liabilities [Abstract] Derivative Liability [Abstract] Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Other than Temporary Impairment, Credit Losses Recognized in Earnings, Categories of Investments [Domain] Document Quarterly Report Document Quarterly Report Due after one year through five years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five Policy loans Policy Loans [Member] Accumulated other comprehensive income Balance, Beginning of Period Balance, End of Period Accumulated Other Comprehensive Income (Loss), Net of Tax Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases Fair Value Hedge Liabilities Fair Value Hedge Liabilities Pension Adjustments Service Cost Pension Adjustments Service Cost [Member] Mortgage Loans By Credit Quality Indicator Range Two [Member] Mortgage Loans By Credit Quality Indicator Range Two [Member] Mortgage loans with a loan-to-value ratio of 60% to 69.99%. Weighted average outstanding shares (denominator for basic calculation) Weighted Average Number of Shares Outstanding, Basic Stock Price or TSR Estimation Method Stock Price or TSR Estimation Method [Text Block] Liability For Future Policy Benefits Before Reinsurance Other Long Duration Contracts Liability For Future Policy Benefits Before Reinsurance Other Long Duration Contracts Liability For Future Policy Benefits Before Reinsurance Other Long Duration Contracts not already included in the rollforward. Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss Due within five years Mortgage Loans On Real Estate Due One Year Through Five Years [Member] Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Line Items] Document Information [Table] Document Information [Table] Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Equity, Including Portion Attributable to Noncontrolling Interest Real Estate [Table] Real Estate [Table] Derivative Average Remaining Maturity Derivative, Average Remaining Maturity Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures Real Estate Investments, Unconsolidated Real Estate and Other Joint Ventures Name Awards Close in Time to MNPI Disclosures, Individual Name Interest Sensitive Contract Liabilities Embedded Derivatives [Member] Interest Sensitive Contract Liabilities Embedded Derivatives [Member] Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss Reinsurance Funds Withheld Assets [Line Items] Reinsurance Funds Withheld Assets [Line Items] Reinsurance Funds Withheld Assets [Line Items] Entity filer category Entity Filer Category Corporate and Other [Member] Corporate Segment and Other Operating Segment [Member] Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age Net Amount at Risk by Product and Guarantee, Weighted Average Attained Age Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Security Not Offset Statistical Measurement [Domain] Statistical Measurement [Domain] Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax Market Risk Benefit, Increase (Decrease) from Interest Rate Change Market Risk Benefit, Increase (Decrease) from Interest Rate Change Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] AOCI Components [Domain] AOCI Components [Domain] -- None. No documentation exists for this element. -- Estimated Value of Liabilities Assumed and Assets Reflected On The Balance Sheet Minimum Estimate Estimated Value of Liabilities Assumed and Assets Reflected On The Balance Sheet Minimum Estimate Estimated Value of Liabilities Assumed and Assets Reflected On The Balance Sheet Minimum Estimate Financing Receivable, Past Due [Table Text Block] Financing Receivable, Past Due [Table Text Block] Net Derivatives Gains (Losses) Deferred in AOCI Gains Losses Deferred In Accumulated Other Comprehensive Income Loss On Derivatives Effective Portion The current period gain (loss) recognized in other comprehensive income related to the effective portion of derivatives designated in cash flow hedges. Internal Credit Assessment [Axis] Internal Credit Assessment [Axis] Liability for Future Policy Benefit, by Product Segment [Line Items] Liability for Future Policy Benefit, by Product Segment [Line Items] Ceded Credit Risk, Disclosure Ceded Credit Risk, Disclosure All Trading Arrangements All Trading Arrangements [Member] Gross Premiums And Interest Expense Liability Future Policy Benefits Gross Premiums And Interest Expense Liability Future Policy Benefits [Table Text Block] Gross Premiums And Interest Expense Liability Future Policy Benefits Compensation Actually Paid vs. Net Income Compensation Actually Paid vs. Net Income [Text Block] Policyholder Account Balance Foreign Currency Translation Policyholder Account Balance Foreign Currency Translation Policyholder Account Balance Foreign Currency Translation Assets Sold under Agreements to Repurchase, Type [Domain] Assets Sold under Agreements to Repurchase, Type [Domain] NEW YORK STOCK EXCHANGE, INC. [Member] NEW YORK STOCK EXCHANGE, INC. [Member] Rule 10b5-1 Arrangement Adopted Rule 10b5-1 Arrangement Adopted [Flag] Awards Close in Time to MNPI Disclosures Awards Close in Time to MNPI Disclosures [Table] Derivative [Line Items] Derivative [Line Items] Income Taxes Paid, Net Income Taxes Paid, Net Other Commitments [Line Items] Other Commitments [Line Items] Pay vs Performance Disclosure [Line Items] Peer Group Total Shareholder Return Amount Peer Group Total Shareholder Return Amount Other impairment losses and change in mortgage loan provision Other Impairment Losses And Change In Mortgage Loan Provision Other impairment losses and change in mortgage loan provision. Residential mortgage-backed securities Residential Mortgage-Backed Securities [Member] Derivative [Table] Derivative [Table] Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss) Liability for Unpaid Claims and Claims Adjustment Expense, Foreign Currency Translation Gain (Loss) Synthetic Guaranteed Investment Contracts Synthetic Guaranteed Investment Contracts [Member] Synthetic Guaranteed Investment Contracts TEXAS TEXAS Financial Futures Future [Member] Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral Derivative Liability, Subject to Master Netting Arrangement, before Offset of Collateral Other Performance Measure, Amount Other Performance Measure, Amount Future policy benefits Liability for Future Policy Benefit, before Reinsurance Cash Flow Hedging [Member] Cash Flow Hedging [Member] Industry Sector [Domain] Industry Sector [Domain] Available-for-sale Securities, Realized Losses, Excluding Other than Temporary Impairments Debt Securities, Available-for-Sale, Realized Loss Service cost Defined Benefit Plan, Service Cost Policyholder Account Balance [Line Items] Policyholder Account Balance [Line Items] Entity Tax Identification Number Entity Tax Identification Number Treasury Stock, Shares, Acquired Treasury Stock, Shares, Acquired Retirement Plan Type [Axis] Retirement Plan Type [Axis] Retrocession Arrangements And Reinsurance Ceded Receivables [Abstract] Retrocession Arrangements And Reinsurance Ceded Receivables [Abstract] Partnership Partnership [Member] Deferred policy acquisition costs Deferred Policy Acquisition Cost Treasury Stock, Common Treasury Stock, Common [Member] Other operating expenses Other Cost and Expense, Operating Debt Securities, Available-for-Sale, Allowance for Credit Loss, Securities Sold Debt Securities, Available-for-Sale, Allowance for Credit Loss, Securities Sold Retail Retail Site [Member] Equity Components [Axis] Equity Components [Axis] Fixed maturity securities available-for-sale, at fair value (amortized cost of $91,888 and $82,907; allowance for credit losses of $132 and $98) Fixed maturity securities, available-for-sale Total Debt Securities, Available-for-Sale Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 to 0399 Policyholder Account Balance, Guaranteed Minimum Crediting Rate, Range from 0300 to 0399 [Member] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value Gain (Loss) on Sale of Derivatives Gain (Loss) on Sale of Derivatives Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0001 to 0050 [Member] AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, before Tax Investment Income [Member] Investment Income [Member] Investment Income [Member] Investments [Domain] Investments [Domain] Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) of Actual Variance from Expected Experience Market Risk Benefit [Table] Market Risk Benefit [Table] Financing Receivable, Credit Quality Indicator [Line Items] Financing Receivable, Credit Quality Indicator [Line Items] Credit Loss [Abstract] Credit Loss [Abstract] Geographical [Axis] Geographical [Axis] Maturities of fixed maturity securities available-for-sale Proceeds from Maturities, Prepayments and Calls of Debt Securities, Available-for-Sale EMEA [Member] EMEA [Member] Weighted Average [Member] Weighted Average [Member] Residential Mortgage Residential Mortgage [Member] Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change Liability for Future Policy Benefit, Expected Net Premium, Increase (Decrease) for Other Change Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table Aggregate Grant Date Fair Value of Equity Award Amounts Reported in Summary Compensation Table [Member] Other Liabilities Other Liabilities [Member] Debt Securities, Available-for-sale [Line Items] Debt Securities, Available-for-Sale [Line Items] Performing Performing [Member] Recorded Investment In Residential Real Estate Loans that are in a Performing status. Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years Debt Securities, Available-for-sale, Unrealized Loss Position, Total Debt Securities, Available-for-Sale, Unrealized Loss Position Credit Default Option Credit Default Option [Member] Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Cash, Cash Equivalents, Restricted Cash, and Restricted Cash Equivalents Available-for-sale Securities, Equity Securities Equity Securities, FV-NI, Current Debt Service Coverage Ratio Range Two [Member] Debt Service Coverage Ratio Range Two [Member] Mortgage loans with a debt service coverage ratio of 1.00x - 1.20x. Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Internal Investment Grade [Member] Internal Investment Grade [Member] Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance Liability for Future Policy Benefit, Reinsurance Recoverable, after Allowance Treasury Stock, Common, Shares Treasury Stock, Common, Shares Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments Change in Unrealized Gain (Loss) on Fair Value Hedging Instruments Forgone Recovery due to Disqualification of Tax Benefits, Amount Forgone Recovery due to Disqualification of Tax Benefits, Amount Product and Service [Domain] Product and Service [Domain] Fair Value Disclosures [Abstract] Fair Value Disclosures [Abstract] Valuation, Income Approach [Member] Valuation, Income Approach [Member] Prior Year Claims and Claims Adjustment Expense Prior Year Claims and Claims Adjustment Expense Limited partnership Fair Value Member Limited partnership Fair Value Member [Member] Limited partnership Fair Value Member Fair Value By Major Category [Axis] Fair Value By Major Category [Axis] Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) Interest On Liability For Policy And Contract Claims Interest On Liability For Policy And Contract Claims Interest incurred on the liability for policy and contract claims during the period. Apartment Apartment Building [Member] Security Exchange Name Security Exchange Name Equity Options Equity [Member] Financing Receivable, Credit Quality Indicator [Table] Financing Receivable, Credit Quality Indicator [Table] Change in instrument-specific credit risk for market risk benefits OCI, Market Risk Benefit, Instrument-Specific Credit Risk, Gain (Loss), after Adjustments and Tax Credit Rating, AM Best [Axis] Credit Rating, AM Best [Axis] Fixed Maturities [Member] Fixed Maturities [Member] Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater Policyholder Account Balance, above Guaranteed Minimum Crediting Rate, Range from 0151 and Greater [Member] Finance Finance Industry [Member] Forgone Recovery, Explanation of Impracticability Forgone Recovery, Explanation of Impracticability [Text Block] Debt Securities, Available-for-sale Debt Securities, Available-for-Sale [Table Text Block] PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0100 PolicyholderAccountBalanceAboveGuaranteedMinimumCreditingRateRangeFrom0051To0100 [Member] Policyholder Account Balance Above Guaranteed Minimum Crediting Rate Range From 0051 To 0100 Member Total investment related gains (losses), net Realized Investment Gains (Losses) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales Corporate Securities by Investment Sector And Credit Rating [Line Items] Corporate Securities by Investment Sector And Credit Rating [Line Items] -- None. No documentation exists for this element. -- Common Stock, Shares, Issued Common Stock, Shares, Issued Common Stock, Shares, Issued Common Stock, Shares, Issued Other Assets Other Assets [Member] Actuarial gains/(losses) Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Entity [Domain] Entity [Domain] Year Of Origination 2020 [Member] Year Of Origination 2020 [Member] Year Of Origination 2020 [Member] Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance Liability for Future Policy Benefit, Expected Future Policy Benefit, Undiscounted, before Reinsurance WASHINGTON WASHINGTON Recorded investment Financing Receivable, before Allowance for Credit Loss Financing Receivable, before Allowance for Credit Loss Measurement Input, Lapse Rate [Member] Measurement Input, Lapse Rate [Member] Unrealized Gain Loss Reclass [Axis] Unrealized Gain Loss Reclass [Axis] -- None. No documentation exists for this element. -- Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss Net Amounts Presented in the Balance Sheet Derivative Liability Derivative Liability Schedule Major Categories Of Investment Income Net of Expenses [Table] Schedule Major Categories Of Investment Income Net of Expenses [Table] Insider Trading Policies and Procedures Adopted Insider Trading Policies and Procedures Adopted [Flag] Debt Service Coverage Ratio By Range [Domain] Debt Service Coverage Ratio By Range [Domain] [Domain] for Debt Service Coverage Ratio By Range [Axis] Other Receivable, Allowance for Credit Loss, Noncurrent Other change in allowance for credit losses and impairments Other change in allowance for credit losses and impairments Reconciliation of Assets from Segment to Consolidated [Table] Reconciliation of Assets from Segment to Consolidated [Table] Liability for Future Policy Benefit, by Product Segment [Table] Liability for Future Policy Benefit, by Product Segment [Table] Schedule of Assets Sold under Agreements to Repurchase [Table] Asset Sold under Agreement to Repurchase [Table] Common stock shares authorized Common Stock, Shares Authorized Derivative Assets (Liabilities), at Fair Value, Net Derivative Assets (Liabilities), at Fair Value, Net Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure Funds Held Under Reinsurance Agreements, Asset Fair Value Disclosure Insurance [Abstract] Insurance [Abstract] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 Utility Utility Industry [Member] Other comprehensive income (loss), net of tax: Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract] Future Policy Benefits Reconciliation To Balance Sheet Future Policy Benefits Reconciliation To Balance Sheet [Table Text Block] Future Policy Benefits Reconciliation To Balance Sheet Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change Liability for Future Policy Benefit, Expected Future Benefit, Original Discount Rate, before Reinsurance, after Cash Flow Change Ceded Credit Risk [Table] Ceded Credit Risk [Table] Long-Term Debt, Type [Axis] Long-Term Debt, Type [Axis] Due after ten years Mortgage Loans On Real Estate Due After Ten Years [Member] Insurance, Other Insurance, Other [Member] Construction Loan Construction Loan Amortization of prior actuarial loss Defined Benefit Plan, Amortization of Gain (Loss) Major Categories Of Investment Income Net of Expenses [Line Items] Major Categories Of Investment Income Net of Expenses [Line Items] Policyholder Account Balance, Issuance Policyholder Account Balance, Issuance Segment Reporting, Asset Reconciling Item [Line Items] Segment Reporting, Asset Reconciling Item [Line Items] Hedging Designation [Domain] Hedging Designation [Domain] Sales of short-term investments Proceeds from Sale of Short-Term Investments Effect of updating discount rates on future policy benefits OCI, Liability for Future Policy Benefit, Gain (Loss), after Reclassification Adjustment and Tax Other Notes Payable Other Notes Payable Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer Long-term debt Long-Term Debt Pension Adjustments Prior Service Cost Pension Adjustments Prior Service Cost [Member] Counterparty Credit Derivative Exposure Counterparty Credit Derivative Exposure Counterparty Credit Derivative Exposure Principal payments on mortgage loans Proceeds from Sale and Collection of Mortgage Notes Receivable Investment revenue Investment Revenue This item represents investment income derived from investments in debt and equity securities consisting of interest income earned from investments in debt securities and on cash and cash equivalents, dividend income from investments in equity securities, and income or expense derived from the amortization of investment related discounts or premiums, respectively. This item does not include realized or unrealized gains or losses on the sale or holding of investments in debt and equity securities required to be included in earnings for the period or for other than temporary losses related to investments in debt and equity securities which are included in realized losses in the period recognized, and does not include investment income from real or personal property, such as rental income. Invested Assets On Deposit Invested Assets On Deposit [Table Text Block] Invested Assets On Deposit, Invested assets pledged and received as collateral, assets held to satisfy collateral requirements and FHLB common stock restricted as to sale. Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk Pension Benefits Adjustments, Footnote Pension Benefits Adjustments, Footnote [Text Block] Total Shareholder Return Vs Peer Group Total Shareholder Return Vs Peer Group [Text Block] Investment expense Investment Income, Investment Expense Investment Income, Investment Expense Maturity Overnight [Member] Maturity Overnight [Member] Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance Liability For Future Policy Benefit Expected Future Policy Benefit Discounted Before Reinsurance Other Comprehensive Income Location [Domain] Other Comprehensive Income Location [Domain] Funds withheld at interest Funds Withheld At Interest [Member] Investments under the control of the cedant which are reflected on the balance sheet of the reinsurer. Guaranteed Insurance Contract, Type of Guarantee [Axis] Guaranteed Insurance Contract, Type of Guarantee [Axis] Japanese Government Japanese Government [Member] Japanese Government Liabilities Liabilities [Abstract] Defined benefit pension and postretirement plan adjustments Other Comprehensive (Income) Loss, Defined Benefit Plan, Reclassification Adjustment from AOCI, after Tax Revenues Revenues [Abstract] Current fiscal year end date Current Fiscal Year End Date PEO Name PEO Name Allowance For Loan and Lease Losses Provision Of Credit Losses Allowance For Loan and Lease Losses Provision Of Credit Losses Allowance For Loan and Lease Losses Provision Of Credit Losses Award Type [Domain] Award Type [Domain] Compensation Actually Paid vs. Company Selected Measure Compensation Actually Paid vs. Company Selected Measure [Text Block] Restatement [Axis] Revision of Prior Period [Axis] Non-PEO NEO Non-PEO NEO [Member] Investments, Fair Value Disclosure Investments, Fair Value Disclosure Additional Paid-in Capital [Member] Additional Paid-in Capital [Member] Hedging Relationship [Axis] Hedging Relationship [Axis] Employee Benefit Plans Retirement Benefits [Text Block] Standard & Poor's, B Rating Standard & Poor's, B Rating [Member] Class of Stock [Line Items] Class of Stock [Line Items] Concentration Risk Disclosure [Text Block] Concentration Risk Disclosure [Text Block] Class of Stock [Axis] Class of Stock [Axis] Schedule Of Defined Benefit Plans Disclosures Text Block Schedule of Defined Benefit Plans Disclosures [Table Text Block] Operating Lease, Right-of-Use Asset, Periodic Reduction Operating Lease, Right-of-Use Asset, Periodic Reduction Name Measure Name Entity Interactive Data Current Entity Interactive Data Current Sales of fixed maturity securities available-for-sale Proceeds from Sale of Debt Securities, Available-for-Sale Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 CANADA CANADA Claims and other policy benefits Policyholder Benefits and Claims Incurred, Net Schedule Of Fair Value Assets and Liabilities Measured on Recurring Basis Table Text Block Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Securities or Other Assets Sold under Agreements to Repurchase [Axis] Securities or Other Assets Sold under Agreements to Repurchase [Axis] Liability for Future Policy Benefit, Weighted-Average Duration Liability for Future Policy Benefit, Weighted-Average Duration Funds withheld at interest Funds Held under Reinsurance Agreements, Asset Policy loans Loans, Gross, Insurance Policy Accumulated Defined Benefit Plans Adjustment [Member] Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Common Stock Outstanding [Member] Common Stock Outstanding [Member] Common Stock Outstanding [Member] Supplemental disclosures of cash flow information Supplemental Cash Flow Information [Abstract] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Credit Rating, Standard & Poor's [Axis] Credit Rating, Standard & Poor's [Axis] Cash Flow Derivatives Deferred In OCI Cash Flow Derivatives Deferred In OCI Cash Flow Derivatives Deferred In OCI Effective Income Tax Rate Reconciliation, Percent Effective Income Tax Rate Reconciliation, Percent Mortgage Loan Internal Credit Risk Grade [Table Text Block] Financing Receivable Credit Quality Indicators [Table Text Block] Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Table] Policyholder Account Balance, Guaranteed Minimum Crediting Rate [Table] Single Name Credit Default Swaps [Member] Single Name Credit Default Swaps [Member] -- None. No documentation exists for this element. -- Federal Home Loan Bank Certificates and Obligations (FHLB) Federal Home Loan Bank Certificates and Obligations (FHLB) [Member] Total liabilities and shareholders’ equity Liabilities and Equity Rule 10b5-1 Arrangement Terminated Rule 10b5-1 Arrangement Terminated [Flag] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Credit Derivative Current Fair Value Credit Risk Derivatives, at Fair Value, Net Hedging Designation [Axis] Hedging Designation [Axis] Commercial Real Estate Commercial Real Estate [Member] Derivative Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Mortgage Loan Maturity [Table] Mortgage Loan Maturity [Table] Dividends to shareholders Payments of Dividends Guaranteed Insurance Contract, Type of Benefit [Domain] Guaranteed Insurance Contract, Type of Benefit [Domain] Industry Sector [Axis] Industry Sector [Axis] Underlying Security Market Price Change Underlying Security Market Price Change, Percent Expected return on plan assets Defined Benefit Plan, Expected Return (Loss) on Plan Assets Measurement Input Type [Axis] Measurement Input Type [Axis] Individual: Individual [Axis] Line of Credit Facility, Interest Rate Description Line of Credit Facility, Interest Rate Description AOCI Attributable to Parent [Member] AOCI Attributable to Parent [Member] AOCI, Liability for Future Policy Benefit, Parent AOCI, Liability for Future Policy Benefit, Parent [Member] Credit Default Types [Domain] Credit Default Types [Domain] -- None. No documentation exists for this element. -- Product and Service [Axis] Product and Service [Axis] Statement [Line Items] Statement [Line Items] Measurement Input Type [Domain] Measurement Input Type [Domain] Assets Sold under Agreements to Repurchase, Maturity Period [Domain] Repurchase Agreements and Similar Transactions, Maturity Periods [Domain] Federal Home Loan Bank, Advances, Branch of FHLB Bank, Amount of Advances Federal Home Loan Bank, Advance, Branch of FHLBank, Amount Policyholder Account Balance, Weighted Average Crediting Rate Policyholder Account Balance, Weighted Average Crediting Rate Reconciliation Of Operating Profit Loss From Segments To Consolidated Text Block Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block] Compensation Actually Paid vs. Total Shareholder Return Compensation Actually Paid vs. Total Shareholder Return [Text Block] Other Comprehensive Income Location [Axis] Other Comprehensive Income Location [Axis] Industrial Industrial [Member] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value Reinsurance Funds Withheld Assets [Table] Reinsurance Funds Withheld Assets [Table] Reinsurance Funds Withheld Assets Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] Asia Pacific [Member] Asia Pacific [Member] Minimum [Member] Minimum [Member] Internal Noninvestment Grade [Member] Internal Noninvestment Grade [Member] Financing Receivable, Allowance for Credit Loss Financing Receivable, Allowance for Credit Loss Adoption Date Trading Arrangement Adoption Date Change in cash collateral for derivatives and other arrangements Increase (Decrease) Cash Collateral from Counterparties UNITED KINGDOM UNITED KINGDOM Investment grade securities External Credit Rating, Investment Grade [Member] Policy acquisition costs and other insurance expenses Deferred Policy Acquisition Costs, Amortization Expense Deferred Policy Acquisition Costs, Amortization Expense Due after five year through ten years Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Interest Rate Swaption Interest Rate Swaption [Member] Residential Real Estate Residential Real Estate [Member] Segments [Axis] Segments [Axis] Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year Change in Fair Value as of Vesting Date of Prior Year Equity Awards Vested in Covered Year [Member] Interest-sensitive contract liabilities Guaranteed Interest Contracts Derivative Instrument [Axis] Derivative Instrument [Axis] Assets Held-in-trust Asset, Held-in-Trust Exercise Price Award Exercise Price Schedule of Net Investment Hedges, Statements of Financial Performance and Financial Position, Location [Table Text Block] Schedule of Net Investment Hedges, Statements of Financial Performance and Financial Position, Location [Table Text Block] Arrangement Duration Trading Arrangement Duration Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table] Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block] Deposits Deposits [Member] Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months Year of Origination [Domain] Year of Origination [Domain] [Domain] for Year of Origination [Axis] Estimated Value of Liabilities Assumed and Assets Reflected On The Balance Sheet Maximum Estimate Estimated Value of Liabilities Assumed and Assets Reflected On The Balance Sheet Maximum Estimate Estimated Value of Liabilities Assumed and Assets Reflected On The Balance Sheet Maximum Estimate Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year Total investments Investments Market Risk Benefit, Attributed Fee Collected Market Risk Benefit, Attributed Fee Collected Policyholder Account Balance, above Guaranteed Minimum Crediting Rate [Domain] Policyholder Account Balance, above Guaranteed Minimum Crediting Rate [Domain] Material Terms of Trading Arrangement Material Terms of Trading Arrangement [Text Block] All Individuals All Individuals [Member] Income Tax Disclosure [Abstract] Income Tax Disclosure [Abstract] Entities [Table] Entities [Table] AOCI Reclassification [Table] AOCI Reclassification [Table] -- None. No documentation exists for this element. -- Other invested assets Other Investments Document Information, Document [Axis] Document Information, Document [Axis] Other Benefits Other Postretirement Benefits Plan [Member] Statement of Stockholders' Equity [Abstract] Statement of Stockholders' Equity [Abstract] Policyholder Account Balance, Increase (Decrease) from Other Change Policyholder Account Balance, Increase (Decrease) from Other Change Receivables [Abstract] Receivables [Abstract] Change In Fair Value Of Certain Limited Partnership Investments And Other, Net Change In Fair Value Of Certain Limited Partnership Investments And Other, Net Change In Fair Value Of Certain Limited Partnership Investments And Other, Net Embedded Derivatives In Indexed Annuity [Member] Embedded Derivatives In Indexed Annuity [Member] Embedded Derivatives In Indexed Annuity Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Gain, before Tax Amounts Reclassified From AOCI [Member] Amounts Reclassified From AOCI [Member] -- None. No documentation exists for this element. -- Common Stock Issuable [Member] Common Stock Issuable [Member] Common Stock Issuable [Member] Securities As Percentage Of Consolidated Stockholder Equity Securities As Percentage Of Consolidated Stockholder Equity Securities as percentage of consolidated stockholder equity. Other Commitments [Domain] Other Commitments [Domain] Other Segments Other Operating Segment [Member] Assets Fair Value Disclosure Assets, Fair Value Disclosure [Abstract] Other Other Credit Derivatives [Member] Reinsurance Ceded Receivables Percentage Total Reinsurance Ceded Receivables Percentage Total Percentage of the Reinsurance Ceded Receivables and other total that is accounted for by 2 companies. Embedded Derivative, Loss on Embedded Derivative Embedded Derivative, Loss on Embedded Derivative Liability Class [Axis] Liability Class [Axis] Mortgage Loans on Real Estate [Member] Mortgages [Member] Guaranteed Insurance Contract, Type of Benefit [Axis] Guaranteed Insurance Contract, Type of Benefit [Axis] AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, after Tax AOCI, Market Risk Benefit, Instrument-Specific Credit Risk, after Tax Debt Service Coverage Ratio Range One [Member] Debt Service Coverage Ratio Range One [Member] Mortgage loans with a debt service coverage ratio of more than 1.20x. Debt Related Commitment Fees and Debt Issuance Costs Debt Related Commitment Fees and Debt Issuance Costs Liability for Future Policy Benefit, Expected Net Premium, Interest Income Liability for Future Policy Benefit, Expected Net Premium, Interest Income Interest Expense [Member] Interest Expense [Member] Valuation Approach and Technique [Axis] Valuation Approach and Technique [Axis] Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions Schedule Of Assets Held In Support Of Reserves Associated With Coinsurance With Funds Withheld Agreement Schedule Of Assets Held In Support Of Reserves Associated With Coinsurance With Funds Withheld Agreement [Table Text Block] Schedule Of Assets Held In Support Of Reserves Associated With Coinsurance With Funds Withheld Agreement Mortgage Loans on Real Estate, Name, Property Type [Domain] Real Estate [Domain] Securities Loaned Securities Loaned Reinsurance Recoverables, Gross Reinsurance Recoverables, Gross Share Repurchase Program [Domain] Share Repurchase Program [Domain] Fair Value Disclosure, Off-balance Sheet Risks, Face Amount, Liability Fair Value Disclosure, off-Balance-Sheet Risks, Face Amount, Liability Investment Income (Expense) Investment Income (Expense) [Member] Commitments and Contingent Liabilities Commitments and Contingencies Disclosure [Text Block] Stock Issued During Period, Value, Treasury Stock Reissued Stock Issued During Period, Value, Treasury Stock Reissued Measure: Measure [Axis] Asset Class [Domain] Asset Class [Domain] Maturity up to 30 days [Member] Maturity Less than 30 Days [Member] Investments [Abstract] Investments [Abstract] Retrocession Arrangements and Reinsurance Ceded Receivables Retrocession And Claims Recoverable [Text Block] Preferred stock shares authorized Preferred Stock, Shares Authorized Swap Swap [Member] Credit Default Swaps Credit Default Swap [Member] Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures Entity Emerging Growth Company Entity Emerging Growth Company Liability for Future Policy Benefit, Gross Premium Income Liability for Future Policy Benefit, Gross Premium Income Financial and Nonfinancial Liabilities, Fair Value Disclosure Liabilities, Fair Value Disclosure Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items] Other invested assets Other Security Investments [Member] Non-GAAP Measure Description Non-GAAP Measure Description [Text Block] Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax Equity Component [Domain] Equity Component [Domain] Preferred stock par value (per share) Preferred Stock, Par or Stated Value Per Share Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge Increase (Decrease) in Fair Value of Hedged Item in Interest Rate Fair Value Hedge Derivatives and other, net Derivatives And Other Investments Net Net realized gains or losses on investments during the period related to the change in value of embedded derivatives and other realized gains and losses not otherwise categorized. Unrealized Appreciation Depreciation Of Investments [Member] Unrealized Appreciation Depreciation Of Investments [Member] -- None. No documentation exists for this element. -- JAPAN JAPAN Class of Treasury Stock [Table] Class of Treasury Stock [Table] Debt-to-Value [Domain] Debt-to-Value [Domain] Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition Liability for Future Policy Benefit, Expected Future Policy Benefit, Derecognition Unrealized Gain Loss Reclass [Domain] Unrealized Gain Loss Reclass [Domain] -- None. No documentation exists for this element. -- Additional 402(v) Disclosure Additional 402(v) Disclosure [Text Block] Short-Duration Insurance and Deposit Contracts [Text Block] Short-Duration Insurance and Deposit Contracts [Text Block] Entity Shell Company Entity Shell Company Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Financial Asset, 30 to 59 Days Past Due Financial Asset, 30 to 59 Days Past Due [Member] Reinsurance Recoverable for Paid Claims and Claims Adjustments Reinsurance Recoverable for Paid Claims and Claims Adjustments Guarantor Obligations, Nature [Axis] Guarantor Obligations, Nature [Axis] Statement [Table] Statement [Table] Gains (Losses) on Sales of Other Real Estate Gains (Losses) on Sales of Other Real Estate Real Estate Investments, Joint Ventures Real Estate Investments, Joint Ventures Policyholder Account Balance, Cash Surrender Value Policyholder Account Balance, Cash Surrender Value Amortization Of Unrealized Pension And Postretirement Benefits [Member] Amortization Of Unrealized Pension And Postretirement Benefits [Member] -- None. No documentation exists for this element. -- Derivatives Not Designated as Hedging Instruments [Table Text Block] Derivatives Not Designated as Hedging Instruments [Table Text Block] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements Derivative Asset, Subject to Master Netting Arrangement, after Offset Derivative Asset, Subject to Master Netting Arrangement, after Offset Geographic Distribution [Domain] Geographic Distribution [Domain] Market Risk Benefit, Net Amount at Risk Market Risk Benefit, Net Amount at Risk Financing Receivable, Past Due [Line Items] Financing Receivable, Past Due [Line Items] Interest Paid, Excluding Capitalized Interest, Operating Activities Interest Paid, Excluding Capitalized Interest, Operating Activities Non-investment grade securities External Credit Rating, Noninvestment Grade [Member] Fair Value Inputs Level 1 Member Fair Value, Inputs, Level 1 [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Statement of Cash Flows [Abstract] Statement of Cash Flows [Abstract] Commitment Period Two Thousand Thirty Four [Member] Commitment Period Two Thousand Thirty Four [Member] Commitment Period Ending Year 2034 Limited Partner [Member] Limited Partner [Member] Limited Partnership Classification Axis [Axis] Limited Partnership Classification Axis [Axis] Limited Partnership Classification Axis Restatement [Domain] Revision of Prior Period [Domain] Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Number Schedule of Long-Term Debt Instruments [Table] Schedule of Long-Term Debt Instruments [Table] Adjustments for New Accounting Pronouncements [Axis] Accounting Standards Update [Axis] Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net Policyholder Account Balance, Benefit Payment Policyholder Account Balance, Benefit Payment Assets Assets [Member] Reinsurer A [Member] Reinsurer A [Member] Reinsurer A, represents one reinsurance client [Member] Other Commitments [Axis] Other Commitments [Axis] Due after five year through ten years Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid Income Tax Disclosure [Text Block] Income Tax Disclosure [Text Block] Defined Benefit Plan, Benefit Obligation, Payment for Settlement Defined Benefit Plan, Benefit Obligation, Payment for Settlement Fair Value Option Contractholder Directed Unit Linked Investments [Member] Fair Value Option Contractholder Directed Unit Linked Investments [Member] This caption presents other inveted assets carried at fair value of contractholder-direct unit-linked investments. Valuation Technique, Discounted Cash Flow [Member] Valuation Technique, Discounted Cash Flow [Member] Mortgage Loans By Credit Quality Indicator Range One [Member] Mortgage Loans By Credit Quality Indicator Range One [Member] Mortgage loans with a loan-to-value ratio of less than 59.99%. Organization, Consolidation and Presentation of Financial Statements [Abstract] Organization, Consolidation and Presentation of Financial Statements [Abstract] Watch List [Member] Watch List [Member] Watch List Internal Credit Quality Grade Embedded Derivative, Gain (Loss) on Embedded Derivative, Net Embedded Derivative, Gain (Loss) on Embedded Derivative, Net Coinsurance Agreement Ceded Amount Of Counterpartys Inforce Individual Life Insurance Liability Coinsurance Agreement Ceded Amount Of Counterpartys Inforce Individual Life Insurance Liability Coinsurance Agreement Ceded Amount Of Counterpartys Inforce Individual Life Insurance Liability Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) Net cash provided by financing activities Net Cash Provided by (Used in) Financing Activities Percentage Of Total Corporate Fixed Maturity Security Percentage Of Total Corporate Fixed Maturity Security Percentage Of Total Corporate Fixed Maturity Security Sales of equity securities Proceeds from Sale of Equity Method Investments Accounting Changes and Error Corrections [Abstract] Accounting Changes and Error Corrections [Abstract] Sales of limited partnerships and real estate joint ventures Proceeds from Real Estate and Real Estate Joint Ventures Deferred Policy Acquisition Costs Deferred Policy Acquisition Costs [Table Text Block] Long-term Debt, Fair Value Long-Term Debt, Fair Value Entity registrant name Entity Registrant Name Commercial Mortgage Backed Securities [Member] Commercial mortgage-backed securities Commercial Mortgage-Backed Securities [Member] Adjustment to Non-PEO NEO Compensation Footnote Adjustment to Non-PEO NEO Compensation Footnote [Text Block] Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Reinsurance Recoverable for Unpaid Claims and Claims Adjustments Fair Value as of Grant Date Award Grant Date Fair Value Fair Value, Net Asset (Liability) Fair Value, Net Asset (Liability) AM Best, B++ Rating AM Best, B++ Rating [Member] Change in deposit asset on reinsurance Increase (Decrease) in Deposits Fair Value Inputs Level 2 Member Fair Value, Inputs, Level 2 [Member] Equity Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Derivative Liability, Subject to Master Netting Arrangement, after Offset and Deduction Derivative Liability, Subject to Master Netting Arrangement, after Offset and Deduction Geographical [Domain] Geographical [Domain] Restatement Determination Date: Restatement Determination Date [Axis] External Credit Rating by Grouping [Domain] External Credit Rating by Grouping [Domain] Title of 12(b) Security Title of 12(b) Security Common stock – par value $0.01 per share, 140,000,000 shares authorized, 85,310,598 shares issued at June 30, 2025 and December 31, 2024 Common Stock, Value, Issued Policyholder Account Balance, Guaranteed Minimum Crediting Rate Range [Domain] Policyholder Account Balance, Guaranteed Minimum Crediting Rate Range [Domain] Share-based Payment Arrangement [Abstract] Share-Based Payment Arrangement [Abstract] Allowance For Loan And Lease Losses Roll Forward Allowance for Loan and Lease Losses [Roll Forward] Structured Finance [Member] Structured Finance [Member] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward] Short-term investments Fair Value Measured On Recurring Basis Short Term Investments Fair Value, Measured on Recurring Basis, Short Term Investments. Other Comprehensive Income (Loss), before Reclassifications, before Tax Other Comprehensive Income (Loss), before Reclassifications, before Tax Fair Value By Major Category [Domain] Fair Value By Major Category [Domain] Standard & Poor's, BB Rating [Member] Standard & Poor's, BB Rating [Member] Securities Financing Transaction [Domain] Securities Financing Transaction [Domain] RGA [Member] RGA [Member] Reinsurance Group of America, Trading symbol RGA Fair Value by Liability Class [Domain] Fair Value by Liability Class [Domain] Cash flows from financing activities Net Cash Provided by (Used in) Financing Activities [Abstract] Preferred stock – par value $0.01 per share, 10,000,000 shares authorized, no shares issued or outstanding Preferred Stock, Value, Issued Forward Contracts [Member] Forward Contracts [Member] Deferred income taxes Deferred Tax Liabilities, Gross Valuation Approach and Technique [Domain] Valuation Approach and Technique [Domain] Basic earnings per share Earnings Per Share, Basic Securities Sold under Agreements to Repurchase Securities Sold under Agreements to Repurchase [Member] Embedded Derivative Asset, Measurement Input Embedded Derivative Asset, Measurement Input Award Timing MNPI Disclosure Award Timing MNPI Disclosure [Text Block] Liability for Future Policy Benefit, Remeasurement Gain (Loss) Liability for Future Policy Benefit, Remeasurement Gain (Loss) Liability for Future Policy Benefit, Remeasurement Gain (Loss) Income Affect Of Non Hedging Derivatives [Line Items] Income Affect Of Non Hedging Derivatives [Line Items] Changes in estimated fair value related to embedded derivatives Abstract. Aggregate Pension Adjustments Service Cost Aggregate Pension Adjustments Service Cost [Member] Share Repurchase Program [Axis] Share Repurchase Program [Axis] Market Risk Benefit, Change in Fair Value, Gain (Loss) Market Risk Benefit, Change in Fair Value, Gain (Loss) Market Risk Benefit, Change in Fair Value, Gain (Loss) Accounting Standards Update 2023-07 Accounting Standards Update 2023-07 [Member] Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance Liability for Future Policy Benefit, Expected Future Gross Premium, Discounted, before Reinsurance US Treasury and Government [Member] US Treasury and Government [Member] Gross Amounts Offset in the Balance Sheet Derivative Liability, Subject to Master Netting Arrangement, Asset Offset SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] SEC Schedule, 12-29, Real Estate Companies, Investment in Mortgage Loans on Real Estate [Line Items] Credit Derivatives [Line Items] Credit Derivatives [Line Items] Securities Financing Transaction [Axis] Securities Financing Transaction [Axis] Total revenues Revenues Revenues Policyholder Account Balance Policyholder Account Balance Equity Based Compensation Share-Based Payment Arrangement [Text Block] Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate Liability for Future Policy Benefit, Weighted-Average Interest Accretion Rate Entity Address, City or Town Entity Address, City or Town Proceeds from long-term debt issuance, net Proceeds from Issuance of Long-Term Debt Other Invested Assets [Domain] Other Invested Assets [Domain] Gross Amounts Offset in the Balance Sheet Derivative Asset, Subject to Master Netting Arrangement, Liability Offset Equity compensation expense Share-Based Payment Arrangement, Expense Canadian and Canadian provincial governments Canadian Provincial Governments [Member] Segment Reporting, Revenue Reconciling Item [Line Items] Segment Reporting, Revenue Reconciling Item [Line Items] Other Commitments [Table] Other Commitments [Table] Stock appreciation rights granted, weighted average exercise price (per share) Share-Based Compensation Arrangements by Share-Based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Equity Securities, FV-NI, Measurement Input Equity Securities, FV-NI, Measurement Input Common Stock Held In Treasury [Member] Common Stock Held In Treasury [Member] Common Stock Held In Treasury [Member] Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year Dividends or Other Earnings Paid on Equity Awards not Otherwise Reflected in Total Compensation for Covered Year [Member] Financial Asset, Not Past Due Financial Asset, Not Past Due [Member] Liabilities Fair Value Disclosure Liabilities, Fair Value Disclosure [Abstract] Document Fiscal Year Focus Document Fiscal Year Focus Treasury Stock, Value, Acquired, Cost Method Treasury Stock, Value, Acquired, Cost Method Schedule of Long-Term Debt Instruments [Table] Debt Instrument, Name [Domain] Assets, Fair Value Disclosure Assets, Fair Value Disclosure Assets, Fair Value Disclosure Investment Narrative [Line Items] Investment Narrative [Line Items] Document Period End Date Document Period End Date Asset Class [Axis] Asset Class [Axis] Insider Trading Arrangements [Line Items] Debt Service Coverage Ratio Range Three [Member] Debt Service Coverage Ratio Range Three [Member] Mortgage loans with a debt service coverage ratio of less than 1.00x. Securities Financing Transaction, Fair Value Securities Financing Transaction, Fair Value [Member] Other Contract Other Contract [Member] Available For Sale Securities Debt Maturities Amortized Cost Debt Securities, Available-for-Sale, Amortized Cost, Fiscal Year Maturity [Abstract] Liability for Future Policy Benefit Activity [Table] Liability for Future Policy Benefit Activity [Table] Foreign Exchange Contract Foreign Exchange Contract [Member] Document Transition Report Document Transition Report Current Year Claims and Claims Adjustment Expense Current Year Claims and Claims Adjustment Expense Embedded Derivative Liability, Measurement Input Embedded Derivative Liability, Measurement Input Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table] Fair Value, Recurring and Nonrecurring [Table] Customer [Domain] Customer [Domain] Entity current reporting status Entity Current Reporting Status Line of Credit Facility, Initiation Date Line of Credit Facility, Initiation Date Gain Loss On Investments Gain (Loss) on Securities [Table Text Block] Retained Earnings [Member] Retained Earnings [Member] Embedded Derivative, Fair Value of Embedded Derivative Asset Embedded Derivative, Fair Value of Embedded Derivative Asset Financial Asset, Equal to or Greater than 90 Days Past Due Financial Asset, Equal to or Greater than 90 Days Past Due [Member] Net premiums Premiums Earned, Net Mortgage Loans on Real Estate, Description, Type of Property [Axis] Real Estate, Type of Property [Axis] Mortgage Loans By Credit Quality Indicator Range Three [Member] Mortgage Loans By Credit Quality Indicator Range Three [Member] Mortgage loans with a loan-to-value ratio of 70% to 79.99%. Restricted Stock Units (RSUs) Restricted Stock Units (RSUs) [Member] Executive Category: Executive Category [Axis] Non-Hedging Derivatives [Table] Non-Hedging Derivatives [Table] Income Statement Location [Domain] Income Statement Location [Domain] Statement of Income Location, Balance [Domain] Allowance For Mortgage Loan And Lease Losses Provision For Loss Net Allowance For Loan And Lease Losses Provision For Loss Net [Text Block] The table presents the rollforward of valuation allowance for mortgage loans held-for-investment, by portfolio segment. Purchases of fixed maturity securities available-for-sale Payments to Acquire Debt Securities, Available-for-Sale Company Selected Measure Name Company Selected Measure Name