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Investments - Recognized Gains (Losses), net (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Schedule of Investments [Line Items]    
Net realized (losses) on fixed maturity available-for-sale securities $ (19) $ (50)
Net realized/unrealized gains (losses) on other invested assets 60 (5)
Change in allowance for expected credit losses 0 (4)
Realized gains (losses) on certain derivative instruments 21 (89)
Unrealized gains on certain derivative instruments 156 147
Change in fair value of other derivatives and embedded derivatives 5 2
Realized gains on derivatives and embedded derivatives 164 41
Recognized gains and losses, net 275 5
Embedded Derivatives Liabilities in Reinsurance Contracts [Member]    
Schedule of Investments [Line Items]    
Change in fair value of reinsurance related embedded derivatives (18) (19)
Equity securities    
Schedule of Investments [Line Items]    
Net realized/unrealized gains on equity securities and (losses) gains n preferred securities 54 33
Valuation gains (22) 46
Preferred securities    
Schedule of Investments [Line Items]    
Net realized/unrealized gains on equity securities and (losses) gains n preferred securities 16 (10)
Valuation gains $ (15) $ 35