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Business and Summary of Significant Accounting Policies - Management Estimates (Details) - USD ($) $ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Sep. 30, 2021
Business Acquisition [Line Items] |  |  |  |
Change in total benefits and other changes in policy reserves increase (decrease) | $ 73 |  |  |
Future policy benefits | $ 7,050 | $ 5,021 | $ 4,918 |
Change in Accounting Method Accounted for as Change in Estimate |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Future policy benefits |  | $ 99 |  | $ (435)

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