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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 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]        
Gross Realized Gains $ 18 $ 123 $ 247 $ 406
Gross Realized Losses 181 254 1,203 1,280
Aggregate fair value of available for sale securities sold 3,100 2,000 19,700 16,000
Net Investment Income [Line Items]        
Net realized gains (losses) (163) (131) (956) (874)
Fortitude RE Funds Withheld Assets        
Net Investment Income [Line Items]        
Net realized gains (losses) $ (6) $ (64) $ (125) $ (218)