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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, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Investments, Debt and Equity Securities [Abstract]        
Gross Realized Gains $ 14 $ 28 $ 30 $ 43
Gross Realized Losses 165 197 443 313
Aggregate fair value of available for sale securities sold 2,600 2,600 7,400 5,000
Net Investment Income [Line Items]        
Net realized gains (losses) (151) (169) (413) (270)
Fortitude RE Funds Withheld Assets        
Net Investment Income [Line Items]        
Net realized gains (losses) $ (49) $ (1) $ (56) $ (16)