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Other Insurance Liabilities and Separate Accounts - Narrative (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Reduction to accumulated other comprehensive income (loss) | $ 1,264 | $ (334) |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2018-12 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Liability for future policy benefits |  |  | $ 986
Reduction to accumulated other comprehensive income (loss), before tax |  |  | 986
Liability for future policy benefits, after tax |  |  | 766
Reduction to accumulated other comprehensive income (loss) |  |  | $ 766

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