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Investments - Investment Gains (Losses) Net (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Schedule of Investments [Line Items]      
Net realized (losses) gains on fixed maturity available-for-sale securities $ (155) $ (253) $ 111
Realized (losses) gains on other invested assets (25) (68) 8
Change in allowance for expected credit losses (36) (41) 8
Realized (losses) gains on certain derivative instruments (211) (164) 456
Unrealized (losses) gains on certain derivative instruments 358 (693) 159
Change in fair value of reinsurance related embedded derivatives (128) 352 34
Change in fair value of other derivatives and embedded derivatives 11 (10) 6
Realized (losses) gains on derivatives and embedded derivatives 30 (515) 655
Recognized gains and losses, net (164) (1,493) 334
Equity securities      
Schedule of Investments [Line Items]      
Net realized/unrealized (losses) gains on equity and preferred equity securities 23 (386) (434)
Valuation (losses) gains 47 (387) (436)
Preferred securities      
Schedule of Investments [Line Items]      
Net realized/unrealized (losses) gains on equity and preferred equity securities (1) (230) (14)
Valuation (losses) gains $ 80 $ (198) $ 14