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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 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Investments, Debt and Equity Securities [Abstract]        
Gross Realized Gains $ 28 $ 24 $ 43 $ 118
Gross Realized Losses 197 119 313 577
Aggregate fair value of available for sale securities sold 2,600 2,600 5,000 10,700
Net Investment Income [Line Items]        
Net realized gains (losses) (169) (95) (270) (459)
Fortitude RE Funds Withheld Assets        
Net Investment Income [Line Items]        
Net realized gains (losses) $ (1) $ (7) $ (16) $ (59)