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Investments - Proceeds From the Sale of Fixed-Maturity Available-For-Sale Securities (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]      
Proceeds $ 2,698 $ 3,264 $ 4,749
Gross gains 18 14 158
Gross losses $ (145) $ (252) $ (49)