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Insurance Liabilities - Rollforward of Future Policy Benefits (Details) - Universal Life - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Movement in Liabilities for Guarantees on Long-Duration Contracts, Guaranteed Benefit Liability, Gross [Roll Forward]      
Balance, beginning of year $ 4,505 $ 4,751 $ 3,787
Incurred guaranteed benefits 739 603 1,041
Benefits paid (588) (489) (470)
Changes related to unrealized appreciation (depreciation) of investments (1,831) (360) 393
Balance, end of year $ 2,825 $ 4,505 $ 4,751