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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, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Investments, Debt and Equity Securities [Abstract]        
Gross Realized Gains $ 186 $ 290 $ 283 $ 750
Gross Realized Losses 790 155 1,026 226
Aggregate fair value of available for sale securities sold 9,200 6,000 14,000 12,400
Net Investment Income [Line Items]        
Net realized gains (losses) (604) 135 (743) 524
Fortitude RE Funds Withheld Assets        
Net Investment Income [Line Items]        
Net realized gains (losses) $ (122) $ 95 $ (154) $ 390