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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, 2026
Mar. 31, 2025
Investments, Debt and Equity Securities [Abstract]    
Gross Realized Gains $ 20 $ 16
Gross Realized Losses 150 278
Aggregate fair value of available for sale securities sold 3,800 4,800
Net Investment Income [Line Items]    
Net realized gains (losses) (130) (262)
Fortitude RE Funds Withheld Assets    
Net Investment Income [Line Items]    
Net realized gains (losses) $ (15) $ (7)