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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, 2023
Dec. 31, 2022
Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]      
Gross Realized Gains $ 267 $ 446 $ 1,369
Gross Realized Losses 1,329 1,628 441
Aggregate fair value of available for sale securities sold 23,600 20,500 27,300
Net Investment Income [Line Items]      
Net realized gains (losses) (1,100) (1,200) 928
Fortitude RE Funds Withheld Assets      
Net Investment Income [Line Items]      
Net realized gains (losses) $ (133) $ (311) $ 717