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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Investments, Debt and Equity Securities [Abstract]        
Gross Realized Gains $ 11 $ 3 $ 54 $ 121
Gross Realized Losses 95 159 408 736
Aggregate fair value of available for sale securities sold 1,900 2,500 6,900 13,200
Net Investment Income [Line Items]        
Net realized gains (losses) (84) (156) (354) (615)
Fortitude RE Funds Withheld Assets        
Net Investment Income [Line Items]        
Net realized gains (losses) $ (18) $ (4) $ (34) $ (63)