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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
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Investments, Debt and Equity Securities [Abstract]      
Gross Realized Gains $ 72 $ 81 $ 130
Gross Realized Losses 665 700 865
Aggregate fair value of available for sale securities sold 12,400 13,700 15,700
Net Investment Income [Line Items]      
Net realized gains (losses) (593) (619) (735)
Fortitude RE Funds Withheld Assets      
Net Investment Income [Line Items]      
Net realized gains (losses) $ (70) $ (36) $ (67)