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Investments - Carrying amounts of other invested assets (Details) - USD ($)
$ in Millions
9 Months Ended 72 Months Ended
Sep. 30, 2022
Dec. 31, 2028
Dec. 31, 2021
Investments [Line Items]      
Investment real estate $ 2,205   $ 2,727
All other investments 1,964   1,990
Other invested assets [1] 15,794   15,668
Accumulated depreciation on investment in real estate 774   778
Fortitude Re Funds Withheld Assets      
Investments [Line Items]      
Other invested assets 156   100
Hedge Funds and Private Equity Funds      
Investments [Line Items]      
Alternative investments 11,625   10,951
Hedge Funds      
Investments [Line Items]      
Other invested assets $ 1,500   2,000
Percentage available for redemption 56.00%    
Hedge Funds | Forecast      
Investments [Line Items]      
Percentage available for redemption   44.00%  
Private equity funds      
Investments [Line Items]      
Alternative investments $ 8,226   6,588
Other invested assets $ 10,100   $ 8,900
[1] See Note 8 for details of balances associated with variable interest entities.