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Investments - Carrying amounts of other invested assets (Details) - USD ($)
$ in Millions
12 Months Ended 72 Months Ended
Dec. 31, 2023
Dec. 31, 2028
Dec. 31, 2022
Dec. 31, 2021
Investments [Line Items]        
Investment real estate     $ 2,153 $ 2,727
All other investments     1,991 1,990
Other invested assets [1]     15,953 15,668
Accumulated depreciation on investment in real estate     786 778
Fortitude Re Funds Withheld Assets        
Investments [Line Items]        
Other invested assets     156 100
Hedge Funds and Private Equity Funds        
Investments [Line Items]        
Alternative investments     11,809 10,951
Hedge Funds        
Investments [Line Items]        
Other invested assets     1,400 2,000
Percentage available for redemption 66.00%      
Hedge Funds | Forecast        
Investments [Line Items]        
Percentage available for redemption   34.00%    
Private equity funds        
Investments [Line Items]        
Alternative investments     8,428 6,588
Other invested assets     $ 10,400 $ 8,900
[1] See Note 9 for details of balances associated with variable interest entities.