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Income Taxes (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Dec. 31, 2024
Net Investment Income [Line Items]      
Effective tax rate 12.70% (0.30%)  
Income tax expense (benefit) $ 22 $ (1)  
Unrealized gains (losses) on investments 344 (125)  
Accumulated other comprehensive income (loss) (2,181) (2,469) $ (2,462)
Accumulated other comprehensive income (loss) (2,181) $ (2,469) $ (2,462)
Fixed maturities      
Net Investment Income [Line Items]      
Accumulated other comprehensive income (loss) (2,100)    
Accumulated other comprehensive income (loss) $ (2,100)