| Life Insurance, Corporate or Bank Owned, Amount | 217.00M | as of 2025-12-31 |
| Current Federal Tax Expense (Benefit) | 77.00M | 2025-01-01 → 2025-12-31 |
| Current State and Local Tax Expense (Benefit) | -69.00M | 2025-01-01 → 2025-12-31 |
| Current Foreign Tax Expense (Benefit) | 0 | 2025-01-01 → 2025-12-31 |
| Current Income Tax Expense (Benefit) | 8.00M | 2025-01-01 → 2025-12-31 |
| Cash and Cash Equivalents, Fair Value Disclosure | 17.89B | as of 2025-12-31 |
| Deferred Federal Income Tax Expense (Benefit) | -29.00M | 2025-01-01 → 2025-12-31 |
| Deferred State and Local Income Tax Expense (Benefit) | -30.00M | 2025-01-01 → 2025-12-31 |
| Deferred Foreign Income Tax Expense (Benefit) | 0 | 2025-01-01 → 2025-12-31 |
| Deferred Other Tax Expense (Benefit) | -59.00M | 2025-01-01 → 2025-12-31 |
| Operating Lease, Liability, Current | 146.00M | as of 2025-12-31 |
| Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense | -37.00M | 2025-01-01 → 2025-12-31 |
| Federal Income Tax Expense (Benefit), Continuing Operations | 48.00M | 2025-01-01 → 2025-12-31 |
| State and Local Income Tax Expense (Benefit), Continuing Operations | -99.00M | 2025-01-01 → 2025-12-31 |
| Foreign Income Tax Expense (Benefit), Continuing Operations | 0 | 2025-01-01 → 2025-12-31 |
| Equity Method Investment, Other than Temporary Impairment | 50.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount | -1.41B | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount | 13.00M | 2025-01-01 → 2025-12-31 |
| Share-based Payment Arrangement, Expense, Tax Benefit | 20.00M | 2025-01-01 → 2025-12-31 |
| EffectiveIncomeTaxRateReconciliationGiltiAmount | -2.00M | 2025-01-01 → 2025-12-31 |
| Long-term Debt, Fair Value | 16.27B | as of 2025-12-31 |
| Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | 356.00M | as of 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Credit, Amount | 0 | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Share-based Payment Arrangement, Amount | 31.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Nondeductible Expense, Other, Amount | 19.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Contingency, Amount | -92.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Disposition of Business, Amount | 3.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount | -1.00M | 2025-01-01 → 2025-12-31 |
| Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount | 4.00M | 2025-01-01 → 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year One | 650.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Two | 645.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Three | 644.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Four | 540.00M | as of 2025-12-31 |
| Finite-Lived Intangible Asset, Expected Amortization, Year Five | 482.00M | as of 2025-12-31 |
| Treasury Stock, Value, Acquired, Cost Method | 451.00M | 2025-01-01 → 2025-12-31 |
| StockRepurchaseProgramAuthorizedAmount1 | 10.00B | as of 2025-12-31 |
| Stock Repurchase Program, Remaining Authorized Repurchase Amount | 1.83B | as of 2025-12-31 |
| Reinsurance Recoverable for Unpaid Claims and Claims Adjustments | 76.00M | as of 2025-12-31 |
| ShareRepurchaseProgramExciseTaxPayable | 3.00M | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | 5.00M | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | 320.00M | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 256.00M | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 325.00M | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, Less than 12 Months | 1.18B | as of 2025-12-31 |
| Debt Securities, Available-for-sale, Continuous Unrealized Loss Position, 12 Months or Longer | 6.17B | as of 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost | 105.00M | as of 2025-12-31 |
| Unrecorded Unconditional Purchase Obligation | 2.00M | as of 2025-12-31 |
| Right-of-Use Asset Obtained in Exchange for Operating Lease Liability | 65.00M | 2025-01-01 → 2025-12-31 |
| Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | 147.00M | 2025-01-01 → 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Accrued Liabilities | 178.00M | as of 2025-12-31 |
| Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals | 69.00M | as of 2025-12-31 |
| Accounts Receivable, Allowance for Credit Loss, Recovery | 3.00M | 2025-01-01 → 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year One | 169.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Two | 137.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Three | 116.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Four | 99.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, Year Five | 86.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid, after Year Five | 247.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, to be Paid | 854.00M | as of 2025-12-31 |
| Deferred Tax Assets, Other | 48.00M | as of 2025-12-31 |
| Deferred Tax Assets, Gross | 981.00M | as of 2025-12-31 |
| Deferred Tax Assets, Valuation Allowance | 67.00M | as of 2025-12-31 |
| Deferred Tax Assets, Net of Valuation Allowance | 914.00M | as of 2025-12-31 |
| Lessee, Operating Lease, Liability, Undiscounted Excess Amount | 93.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Gross | 1.75B | as of 2025-12-31 |
| Debt Instrument, Repurchased Face Amount | 0 | as of 2025-12-31 |
| Deferred Tax Liabilities, Property, Plant and Equipment | 198.00M | as of 2025-12-31 |
| Assets, Fair Value Disclosure | 37.63B | as of 2025-12-31 |
| Deferred Tax Liabilities, Goodwill and Intangible Assets | 1.38B | as of 2025-12-31 |
| Deferred Tax Liabilities, Other | 27.00M | as of 2025-12-31 |
| Deferred Tax Liabilities, Net | 833.00M | as of 2025-12-31 |
| Premium Receivable, Credit Loss Expense (Reversal) | 99.00M | 2025-01-01 → 2025-12-31 |
| Premium Receivable, Allowance for Credit Loss, Writeoff | 73.00M | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year One | 50.00M | as of 2025-12-31 |
| Defined Contribution Plan, Cost | 138.00M | 2025-01-01 → 2025-12-31 |
| Current Year Claims and Claims Adjustment Expense | 160.11B | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year Two | 2.32B | as of 2025-12-31 |
| Long-Term Debt, Maturity, Year Three | 2.40B | as of 2025-12-31 |
| Prior Year Claims and Claims Adjustment Expense | -2.31B | 2025-01-01 → 2025-12-31 |
| Liability for Unpaid Claims and Claims Adjustment Expense, Incurred Claims | 157.79B | 2025-01-01 → 2025-12-31 |
| Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Current Year | 140.69B | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year Four | 3.38B | as of 2025-12-31 |
| Liability for Unpaid Claims and Claims Adjustment Expense, Claims Paid, Prior Years | 14.68B | 2025-01-01 → 2025-12-31 |
| Long-Term Debt, Maturity, Year Five | 5.85B | as of 2025-12-31 |
| Long-Term Debt, Maturity, after Year Five | 3.50B | as of 2025-12-31 |
| Unrecognized Tax Benefits | 230.00M | as of 2025-12-31 |
| Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions | 4.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions | 8.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | 12.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities | 8.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations | 110.00M | 2025-01-01 → 2025-12-31 |
| Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 120.00M | as of 2025-12-31 |
| Statutory Accounting Practices, Statutory Capital and Surplus Required | 11.29B | as of 2025-12-31 |
| Statutory Accounting Practices, Statutory Capital and Surplus, Balance | 19.73B | as of 2025-12-31 |
| Statutory Accounting Practices, Retained Earnings Not Available for Dividends | 11.29B | as of 2025-12-31 |
| APIC, Share-based Payment Arrangement, Increase for Cost Recognition | 204.00M | 2025-01-01 → 2025-12-31 |