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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
Mar. 31, 2024
Mar. 31, 2023
Investments, Debt and Equity Securities [Abstract]    
Gross Realized Gains $ 20 $ 146
Gross Realized Losses 463 598
Aggregate fair value of available for sale securities sold 4,900 10,800
Net Investment Income [Line Items]    
Net realized gains (losses) (443) (452)
Fortitude RE Funds Withheld Assets    
Net Investment Income [Line Items]    
Net realized gains (losses) $ (37) $ (65)