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Investments - Gross Realized Gains and Gross Realized Losses from Sales or Maturities of Available for Sale Securities (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]        
Gross Realized Gains $ 15 $ 11 $ 45 $ 54
Gross Realized Losses 117 95 560 408
Aggregate fair value of available for sale securities sold 2,500 1,900 9,900 6,900
Net Investment Income [Line Items]        
Net realized gains (losses) (102) (84) (515) (354)
Fortitude RE Funds Withheld Assets        
Net Investment Income [Line Items]        
Net realized gains (losses) $ (6) $ (18) $ (62) $ (34)