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Basis of Presentation and Significant Accounting Policies (Details) - USD ($) | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Jan. 01, 2021 | Jan. 01, 2020 | Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Reserve for future policy benefits |  | $ 561,000,000 | $ 596,000,000 | $ 638,000,000 |  |  |
Participating dividends to policyholders |  | 29,000,000 | 24,000,000 | 29,000,000 |  |  |
Deposit Contracts, Liabilities |  | 0 | 99,000,000 |  |  |  |
Accumulated depreciation |  | 2,300,000,000 | 2,300,000,000 |  |  |  |
Depreciation expense |  | $ 213,000,000 | $ 282,000,000 | 271,000,000 |  |  |
Derivative Liability, Statement of Financial Position [Extensible Enumeration] |  | Other investments, Other liabilities | Other investments, Other liabilities |  |  |  |
Not Designated as Hedging Instrument | Commodity Option |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Derivative, Cost of Hedge | $ 10,000,000 |  |  |  |  |  |
Minimum | Other Intangible Assets |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Useful lives |  | 1 year |  |  |  |  |
Maximum | Other Intangible Assets |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Useful lives |  | 15 years |  |  |  |  |
Reinsurance Policy, Type [Axis]: Adverse Development Cover Navigators Group |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred Revenue |  | $ 209,000,000 |  |  |  |  |
Reinsurance Policy, Type [Axis]: Retroactive Reinsurance [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Paid loss and loss adjustment expenses |  | 1,500,000,000 | $ 1,300,000,000 |  |  |  |
Deferred Revenue, Additions |  | 229,000,000 | 246,000,000 | $ 312,000,000 |  |  |
Reinsurance Policy, Type [Axis]: Retroactive Reinsurance [Member] | Other liabilities |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Deferred Revenue |  | $ 803,000,000 | $ 574,000,000 |  |  |  |
Property and Casualty Insurance Subsidiaries |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Participating Insurance, Percentage of Premium Income |  | 7.00% | 7.00% | 7.00% |  |  |
Accounting Standards Update 2016-13 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  | $ 2,000,000
Accounting Standards Update 2016-13 [Member] | Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  | $ (18,000,000) |
Accounting Standards Update 2016-13 [Member] | Retained Earnings | Cumulative Effect, Period of Adoption, Adjustment [Member] | Other liabilities |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  | $ 25,000,000 |
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Reserve for future policy benefits |  |  |  |  | $ 85,000,000 |  |
Accounting Standards Update 2018-12 | Accumulated Other Comprehensive Income (Loss), net of tax | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | $ 35,000,000 |  |  | $ (65,000,000) |  |

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