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Significant Accounting Policies - New Accounting Pronouncements Recently Adopted (Details) - USD ($)
$ in Millions
Mar. 31, 2023
Dec. 31, 2022
Jan. 01, 2021
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Reduction to accumulated other comprehensive income (loss) $ 875 $ 1,264  
Accounting Standards Update 2018-12 | Cumulative Effect, Period of Adoption, Adjustment      
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