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Investments - Investment Gains (Losses) Net (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Schedule of Investments [Line Items]      
Net realized (losses) gains on fixed maturity available-for-sale securities $ (9) $ (155) $ (253)
Realized gains (losses) on other invested assets 61 (25) (68)
Change in allowance for expected credit losses (33) (36) (41)
Realized gains (losses) on certain derivative instruments 254 (211) (164)
Unrealized (losses) gains on certain derivative instruments (184) 358 (693)
Change in fair value of reinsurance related embedded derivatives (32) (128) 352
Change in fair value of other derivatives and embedded derivatives 12 11 (10)
Realized gains (losses) on derivatives and embedded derivatives 50 30 (515)
Recognized gains and losses, net 83 (164) (1,493)
Equity securities      
Schedule of Investments [Line Items]      
Net realized/unrealized gains (losses) on equity and preferred equity securities 2 23 (386)
Valuation (losses) gains (131) 47 (387)
Preferred securities      
Schedule of Investments [Line Items]      
Net realized/unrealized gains (losses) on equity and preferred equity securities 12 (1) (230)
Valuation (losses) gains $ 13 $ 80 $ (198)