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Business and Basis of Presentation (Universal Life Loss Recognition Reserves/Profit Followed by Losses Liability) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | ---
Other businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change | $ 1,716 | $ 1,921 | $ 2,623 |  |
Universal Life Loss |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change |  |  |  | $ 1,024 |
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses |  |  |  | 6 |
Liability For Future Policy Benefit, Adjustments For Unrealized Investment Gains And Losses After Transition |  |  |  | 1,018 |
Universal Life Loss | Individual Life |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change |  |  |  | 1,018 |
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses |  |  |  | 0 |
Liability For Future Policy Benefit, Adjustments For Unrealized Investment Gains And Losses After Transition |  |  |  | 1,018 |
Universal Life Loss | Other businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change |  |  |  | 6 |
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses |  |  |  | 6 |
Liability For Future Policy Benefit, Adjustments For Unrealized Investment Gains And Losses After Transition |  |  |  | 0 |
Universal Life Loss | As Previously Reported |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change |  |  |  |  | $ 1,829
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses |  |  |  | 680 |
Universal Life Loss | As Previously Reported | Individual Life |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change |  |  |  |  | 1,823
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses |  |  |  | 674 |
Universal Life Loss | As Previously Reported | Other businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, before Reinsurance, after Discount Rate Change |  |  |  |  | $ 6
Liability For Future Policy Benefit, Expected Future Policy Benefit, Before Reinsurance, After Discount Rate Change, Excluding Amounts Related To Unrealized Investment Gains And Losses |  |  |  | 6 |
Universal Life Loss | Effect Of Application Of Accounting Standards Update 2018-12, Unwinding Amounts Related To Unrealized Investment Gains And Losses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  | (1,149) |
Universal Life Loss | Effect Of Application Of Accounting Standards Update 2018-12, Unwinding Amounts Related To Unrealized Investment Gains And Losses | Individual Life |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  | (1,149) |
Universal Life Loss | Effect Of Application Of Accounting Standards Update 2018-12, Unwinding Amounts Related To Unrealized Investment Gains And Losses | Other businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  | 0 |
Universal Life Loss | Effect Of Application Of Accounting Standards Update 2018-12, Derecognizing LRR & PFL |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  | (674) |
Universal Life Loss | Effect Of Application Of Accounting Standards Update 2018-12, Derecognizing LRR & PFL | Individual Life |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  | (674) |
Universal Life Loss | Effect Of Application Of Accounting Standards Update 2018-12, Derecognizing LRR & PFL | Other businesses |  |  |  |  |
Liability for Future Policy Benefit, Activity [Line Items] |  |  |  |  |
Liability for Future Policy Benefit, Expected Future Policy Benefit, Cumulative Increase (Decrease) from Cash Flow Change |  |  |  | $ 0 |

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