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Other Insurance Liabilities and Separate Accounts - Narrative (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Jan. 01, 2021
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