| SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Liability for Future Policy Benefit, Loss, Claim and Loss Expense | 62.81B | as of 2025-12-31 |
| Current Income Tax Expense (Benefit) | 1.11B | 2025-01-01 → 2025-12-31 |
| Cash and Cash Equivalents, Fair Value Disclosure | 6.25B | as of 2025-12-31 |
| SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Other Operating Expense | 4.46B | 2025-01-01 → 2025-12-31 |
| SEC Schedule, 12-16, Insurance Companies, Supplementary Insurance Information, Premium Written | 14.00B | 2025-01-01 → 2025-12-31 |
| Loans Receivable, Fair Value Disclosure | 9.62B | as of 2025-12-31 |
| Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability | 23.00M | 2025-01-01 → 2025-12-31 |
| Translation Adjustment Functional to Reporting Currency, Increase (Decrease), Gross of Tax | 24.00M | 2025-01-01 → 2025-12-31 |
| SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Gross | 245.62B | as of 2025-12-31 |
| SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Ceded | 13.49B | as of 2025-12-31 |
| SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Assumed | 17.87B | as of 2025-12-31 |
| SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Net | 249.99B | as of 2025-12-31 |
| Notes Payable, Fair Value Disclosure | 7.85B | as of 2025-12-31 |
| Income Tax Expense (Benefit), Intraperiod Tax Allocation | 2.02B | 2025-01-01 → 2025-12-31 |
| Derivative Asset, Not Offset, Policy Election Deduction | 13.00M | as of 2025-12-31 |
| DerivativeAssetFairValueAfterOffsetAndDeductionSubjectToMasterNettingArrangement | 3.00M | as of 2025-12-31 |
| Derivative Asset, Not Subject to Master Netting Arrangement | 45.00M | as of 2025-12-31 |
| Derivative Asset, Fair Value, Gross Asset Including Not Subject to Master Netting Arrangement | 179.00M | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | 952.00M | 2025-01-01 → 2025-12-31 |
| Share-based Payment Arrangement, Exercise of Option, Tax Benefit | 31.00M | 2025-01-01 → 2025-12-31 |
| Direct Premiums Earned | 13.76B | 2025-01-01 → 2025-12-31 |
| Ceded Premiums Earned | 368.00M | 2025-01-01 → 2025-12-31 |
| Assumed Premiums Earned | 156.00M | 2025-01-01 → 2025-12-31 |
| Equity Securities, FV-NI, Unrealized Gain (Loss) | 46.00M | 2025-01-01 → 2025-12-31 |
| Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred | 4.00M | 2025-01-01 → 2025-12-31 |
| Securities Borrowed, Liability | 0 | as of 2025-12-31 |
| Securities Borrowed, Collateral, Obligation to Return Securities | 0 | as of 2025-12-31 |
| Securities Borrowed, Collateral, Obligation to Return Cash | 3.94B | as of 2025-12-31 |
| Securities Borrowed, Not Offset, Policy Election Deduction | 0 | as of 2025-12-31 |
| Dividends, Common Stock, Cash | 1.24B | 2025-01-01 → 2025-12-31 |
| Securities Borrowed, Gross Including Not Subject to Master Netting Arrangement | 3.94B | as of 2025-12-31 |
| Securities Borrowed, Amount Offset Against Collateral | 0 | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Unrealized Gain (Loss) | -1.14B | 2025-01-01 → 2025-12-31 |
| Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Liability | 0 | as of 2025-12-31 |
| Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Collateral, Obligation to Return Securities | 34.00M | as of 2025-12-31 |
| Financing Receivable, 90 Days or More Past Due, Still Accruing | 0 | as of 2025-12-31 |
| Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Collateral, Obligation to Return Cash | 4.03B | as of 2025-12-31 |
| Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Not Offset, Policy Election Deduction | 13.00M | as of 2025-12-31 |
| Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed | 4.12B | as of 2025-12-31 |
| Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Gross Including Not Subject to Master Netting Arrangement | 4.12B | as of 2025-12-31 |
| Derivative Asset, Securities Purchased under Agreements to Resell, Securities Borrowed, Amount Offset Against Collateral | 48.00M | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One | 1.68B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 7.70B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 16.14B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 | 35.55B | as of 2025-12-31 |
| Derivative Asset, Fair Value, Gross Liability | 0 | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost | 4.20B | as of 2025-12-31 |
| Derivative Asset, Fair Value, Amount Not Offset Against Collateral | 134.00M | as of 2025-12-31 |
| Treasury Stock, Value, Acquired, Cost Method | 3.61B | 2025-01-01 → 2025-12-31 |
| Derivative Liability, Fair Value, Gross Asset | 0 | as of 2025-12-31 |
| Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 207.00M | as of 2025-12-31 |
| Derivative Liability, Not Offset, Policy Election Deduction | 13.00M | as of 2025-12-31 |
| DerivativeLiabilityFairValueAfterOffsetAndDeductionSubjectToMasterNettingArrangement | 2.00M | as of 2025-12-31 |
| Derivative Liability, Not Subject to Master Netting Arrangement | 765.00M | as of 2025-12-31 |
| Derivative, Notional Amount | 67.53B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One | 1.74B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 8.62B | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 17.02B | as of 2025-12-31 |
| Derivative Liability, Fair Value, Gross Liability Including Not Subject to Master Netting Arrangement | 972.00M | as of 2025-12-31 |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 32.37B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value | 4.37B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 770.00M | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 5.15B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Unrealized Loss Position, Accumulated Loss | 5.92B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 4.78B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 5.92B | as of 2025-12-31 |
| Securities Loaned, Asset | 0 | as of 2025-12-31 |
| Securities Loaned, Collateral, Right to Reclaim Securities | 0 | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 10.66B | as of 2025-12-31 |
| Securities Loaned, Collateral, Right to Reclaim Cash | 0 | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 17.60B | as of 2025-12-31 |
| Securities Loaned, Not Offset, Policy Election Deduction | 3.94B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Unrealized Loss Position | 28.26B | as of 2025-12-31 |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | 24.00M | as of 2025-12-31 |
| Derivative Asset, Fair Value, Amount Offset Against Collateral | 48.00M | as of 2025-12-31 |
| Derivative Liability, Fair Value, Amount Offset Against Collateral | 767.00M | as of 2025-12-31 |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value | 23.00M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Tax Credit Carryforwards, Foreign | 4.97B | as of 2025-12-31 |
| Securities Loaned, Amount Offset Against Collateral | 44.00M | as of 2025-12-31 |
| Deferred Tax Assets, Tax Credit Carryforwards, Other | 1.10B | as of 2025-12-31 |
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss | 731.00M | as of 2025-12-31 |
| Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain | 87.00M | as of 2025-12-31 |
| Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Asset | 0 | as of 2025-12-31 |
| Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Securities | 41.00M | as of 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation | 0 | as of 2025-12-31 |
| Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Collateral, Right to Reclaim Cash | 151.00M | as of 2025-12-31 |
| Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Not Offset, Policy Election Deduction | 3.96B | as of 2025-12-31 |
| Operating Lease, Cost | 42.00M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Other | 4.00M | as of 2025-12-31 |
| Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned | 4.96B | as of 2025-12-31 |
| Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One | 32.00M | as of 2025-12-31 |
| Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 1.42B | as of 2025-12-31 |
| Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 7.18B | as of 2025-12-31 |
| Debt Securities, Held-to-Maturity, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 | 7.49B | as of 2025-12-31 |
| Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Gross Including Not Subject to Master Netting Arrangement | 4.96B | as of 2025-12-31 |
| Derivative Liability, Securities Sold under Agreements to Repurchase, Securities Loaned, Amount Offset Against Collateral | 811.00M | as of 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Reserves | 504.00M | as of 2025-12-31 |
| Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, Year One | 32.00M | as of 2025-12-31 |
| Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | 1.44B | as of 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Other | 40.00M | as of 2025-12-31 |
| Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | 7.24B | as of 2025-12-31 |
| Debt Securities, Held-to-Maturity, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | 6.77B | as of 2025-12-31 |
| Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Transition Asset (Obligation), before Tax | 0 | as of 2025-12-31 |
| Deferred Tax Assets, Unrealized Currency Losses | 7.00M | as of 2025-12-31 |
| Deferred Tax Assets, Investments | 1.36B | as of 2025-12-31 |
| Derivative, Collateral, Right to Reclaim Cash | 151.00M | as of 2025-12-31 |
| Derivative, Collateral, Right to Reclaim Securities | 41.00M | as of 2025-12-31 |
| Derivative, Collateral, Obligation to Return Cash | 84.00M | as of 2025-12-31 |
| Financing Receivable, Troubled Debt Restructuring, Commitment to Lend | 15.00M | as of 2025-12-31 |
| Deferred Tax Assets, Gross | 8.27B | as of 2025-12-31 |
| Derivative, Collateral, Obligation to Return Securities | 34.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Gross | 9.55B | as of 2025-12-31 |
| Deferred Policy Acquisition Cost, Capitalization | 1.10B | 2025-01-01 → 2025-12-31 |
| Deferred Policy Acquisition Cost, Foreign Currency Translation Adjustment and Other | 45.00M | 2025-01-01 → 2025-12-31 |
| Long-term Debt, Gross | 8.38B | as of 2025-12-31 |
| DebtSecuritiesAvailableForSaleAndHeldToMaturityFairValue | 28.43B | as of 2025-12-31 |
| DebtSecuritiesAvailableForSaleAndHeldToMaturityAmortizedCostBeforeAllowanceForCreditLoss | 32.62B | as of 2025-12-31 |
| Assets, Fair Value Disclosure | 72.81B | as of 2025-12-31 |
| Deferred Tax Liabilities, Unrealized Currency Transaction Gains | 0 | as of 2025-12-31 |
| Debt Securities, Held-to-maturity, Allowance for Credit Loss, Writeoff | 0 | 2025-01-01 → 2025-12-31 |
| Deferred Tax Liabilities, Investments | 0 | as of 2025-12-31 |
| Debt Securities, Held-to-maturity, Allowance for Credit Loss, Period Increase (Decrease) | 0 | 2025-01-01 → 2025-12-31 |
| Financial and Nonfinancial Liabilities, Fair Value Disclosure | 972.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Other | 237.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Net | 1.28B | as of 2025-12-31 |
| Deferred Tax Liabilities, Deferred Expense, Reserves and Accruals | 6.58B | as of 2025-12-31 |
| Fair Value Hedges, Net | 0 | as of 2025-12-31 |
| Reinsurance Recoverable, Credit Loss Expense (Reversal) | -1.00M | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year One | 700.00M | as of 2025-12-31 |
| Defined Contribution Plan, Cost | 21.00M | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year Two | 458.00M | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Three | 0 | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Four | 539.00M | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Five | 1.50B | as of 2025-12-31 |
| Long-Term Debt, Maturity, after Year Five | 5.18B | as of 2025-12-31 |
| Off-Balance Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) | 0 | 2025-01-01 → 2025-12-31 |
| Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Allowance for Credit Loss, Writeoff | 0 | 2025-01-01 → 2025-12-31 |
| Debt Securities, Available-for-sale, Allowance for Credit Loss, Period Increase (Decrease) | 0 | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits | 0 | as of 2025-12-31 |
| Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | 0 | 2025-01-01 → 2025-12-31 |
| Interest Rate Fair Value Hedge Derivative at Fair Value, Net | 0 | as of 2025-12-31 |
| LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitBeforeReinsuranceAfterDiscountRateChange | 100.52B | as of 2025-12-31 |
| Liability for Future Policy Benefit, before Reinsurance | 62.32B | as of 2025-12-31 |
| LiabilityForFuturePolicyBenefitExpectedFuturePolicyBenefitUndiscountedBeforeReinsurance | 173.05B | as of 2025-12-31 |
| LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumUndiscountedBeforeReinsurance | 143.47B | as of 2025-12-31 |
| LiabilityForFuturePolicyBenefitExpectedFutureGrossPremiumDiscountedBeforeReinsurance | 99.70B | as of 2025-12-31 |
| Liability for Future Policy Benefit, Interest Expense | 2.25B | 2025-01-01 → 2025-12-31 |
| LiabilityForFuturePolicyBenefitRemeasurementGainLossLimitedPaymentContract | -52.00M | 2025-01-01 → 2025-12-31 |
| LiabilityForFuturePolicyBenefitRemeasurementGainLoss | 694.00M | 2025-01-01 → 2025-12-31 |
| Foreign Earnings Repatriated | 2.68B | 2025-01-01 → 2025-12-31 |
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value | 3.52B | as of 2025-12-31 |
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings | -4.00M | 2025-01-01 → 2025-12-31 |
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss) | 57.00M | 2025-01-01 → 2025-12-31 |
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases | 1.18B | 2025-01-01 → 2025-12-31 |
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales | 3.00M | 2025-01-01 → 2025-12-31 |
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Issuances | 0 | 2025-01-01 → 2025-12-31 |
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements | 203.00M | 2025-01-01 → 2025-12-31 |
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3 | 395.00M | 2025-01-01 → 2025-12-31 |
| Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 133.00M | 2025-01-01 → 2025-12-31 |
| Fair Value, Asset, Recurring Basis, Still Held, Unrealized Gain (Loss) | 2.00M | 2025-01-01 → 2025-12-31 |
| Financing Receivable, Nonaccrual | 643.00M | as of 2025-12-31 |
| Financing Receivable, Nonaccrual, Interest Income | 2.00M | 2025-01-01 → 2025-12-31 |
| Derivative, Net Liability Position, Aggregate Fair Value | 861.00M | as of 2025-12-31 |
| Additional Collateral, Aggregate Fair Value | 669.00M | as of 2025-12-31 |
| Real Estate Owned, Accumulated Depreciation | 41.00M | as of 2025-12-31 |
| DebtSecuritiesAvailableForSaleAmortizedCostAfterAllowanceForCreditLoss | 65.26B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Amortized Cost | 65.26B | as of 2025-12-31 |
| Deferred Tax Liabilities, Deferred Expense, Deferred Policy Acquisition Cost | 2.69B | as of 2025-12-31 |
| Derivative Liability, Fair Value, Gross Liability | 207.00M | as of 2025-12-31 |
| Derivative Asset, Fair Value, Gross Asset | 134.00M | as of 2025-12-31 |
| Securities Loaned, Including Not Subject to Master Netting Arrangement and Assets other than Securities Transferred | 3.99B | as of 2025-12-31 |
| Securities Loaned and Securities Sold under Agreement to Repurchase, Gross Including Not Subject to Master Netting Arrangement | 3.99B | as of 2025-12-31 |
| Securities Loaned, Gross Including Not Subject to Master Netting Arrangement | 3.99B | as of 2025-12-31 |
| Assets Held by Insurance Regulators | 20.00M | as of 2025-12-31 |