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v3.25.0.1

Basis of Presentation and Significant Accounting Policies (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2027 | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Participating dividends to policyholders |  |  | $ 0 | $ 0 | $ 0
Derivative Liability, Statement of Financial Position [Extensible Enumeration] |  |  | Other investments, Other liabilities | Other investments, Other liabilities |
Deposit Contracts, Liabilities |  |  | $ 0 | $ 0 |
Accumulated depreciation |  |  | 2,500,000,000 | 2,400,000,000 |
Depreciation expense |  |  | 177,000,000 | 204,000,000 | 213,000,000
Hosting Arrangement, Service Contract, Implementation Cost, Expense, Amortization |  |  | 108,000,000 | 85,000,000 | 78,000,000
Policyholder Dividends, Expense |  |  | $ 39,000,000 | $ 39,000,000 | 29,000,000
Equity Security, FV-NI, Contractual Sale Restriction, Nature of Restriction and Circumstance for Lapse |  |  | Level 3 includes investments that have contractual sales restrictions that require consent to sell and are in place for the duration that the securities are held by the Company. | Level 3 includes investments that have contractual sales restrictions that require consent to sell and are in place for the duration that the securities are held by the Company. |
Change in Accounting Principle, Accounting Standards Update, Adoption Date |  |  | Dec. 31, 2024 |  |
Change in Accounting Principle, Accounting Standards Update, Adopted [true false] |  |  | true |  |
Accounting Standards Update [Extensible Enumeration] |  |  | Accounting Standards Update 2023-07 [Member] |  |
Subsequent Event [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Change in Accounting Principle, Accounting Standards Update, Adoption Date | Dec. 31, 2027 | Dec. 31, 2025 |  |  |
Accounting Standards Update [Extensible Enumeration] | Accounting Standards Update 2024-03 [Member] | Accounting Standards Update 2023-09 [Member] |  |  |
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected [Extensible Enumeration] | Accounting Standards Updates 2024-03 Prospective [Member] |  |  |  |
Minimum [Member] | Other Intangible Assets [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 1 year |  |
Maximum | Other Intangible Assets [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Finite-Lived Intangible Asset, Useful Life |  |  | 15 years |  |
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Deferred Revenue |  |  | $ 64,000,000 | $ 209,000,000 |
Policyholder Benefits and Claims Incurred, Ceded |  |  | 300,000,000 |  |
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group | Remaining [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy |  |  | 0 |  |
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group | Maximum |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Reinsurance, Excess Retention, Amount Reinsured, Per Policy |  |  | 300,000,000 |  |
Reinsurance Policy, Type [Axis]: Retroactive Reinsurance [Member] |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Paid loss and loss adjustment expenses |  |  | 1,600,000,000 | 1,700,000,000 |
Deferred Revenue, Additions |  |  | (83,000,000) | (194,000,000) | $ (229,000,000)
Reinsurance Policy, Type [Axis]: Retroactive Reinsurance [Member] | Other liabilities |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Deferred Revenue |  |  | $ 914,000,000 | $ 997,000,000 |
Property and Casualty Insurance Subsidiaries |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Participating Insurance, Percentage of Premium Income |  |  | 6.00% | 6.00% | 7.00%
Policyholder Benefits and Claims Incurred, Ceded |  |  | $ 1,241,000,000 | $ 1,043,000,000 | $ 1,338,000,000

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