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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Investments, Debt and Equity Securities [Abstract]        
Gross Realized Gains $ 123 $ 348 $ 406 $ 1,098
Gross Realized Losses 254 123 1,280 349
Aggregate fair value of available for sale securities sold 2,000 6,700 16,000 19,100
Net Investment Income [Line Items]        
Net realized gains (losses) (131) 225 (874) 749
Fortitude RE Funds Withheld Assets        
Net Investment Income [Line Items]        
Net realized gains (losses) $ (64) $ 159 $ (218) $ 549