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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, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]        
Gross Realized Gains $ 83 $ 186 $ 229 $ 283
Gross Realized Losses 424 790 1,022 1,026
Aggregate fair value of available for sale securities sold 5,800 9,200 16,600 14,000
Net Investment Income [Line Items]        
Net realized gains (losses) (341) (604) (793) (743)
Fortitude RE Funds Withheld Assets        
Net Investment Income [Line Items]        
Net realized gains (losses) $ (54) $ (122) $ (119) $ (154)