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Investments - Carrying amounts of other invested assets (Details) - USD ($)
$ in Millions
3 Months Ended 72 Months Ended
Mar. 31, 2023
Dec. 31, 2028
Dec. 31, 2022
Investments [Line Items]      
Investment real estate $ 2,199   $ 2,153
All other investments 2,053   1,991
Other invested assets [1] 16,104   15,953
Accumulated depreciation on investment in real estate 802   786
Fortitude Re Funds Withheld Assets      
Investments [Line Items]      
Other invested assets 156   156
Hedge Funds and Private Equity Funds      
Investments [Line Items]      
Alternative investments 11,852   11,809
Hedge Funds      
Investments [Line Items]      
Other invested assets $ 1,300   1,400
Percentage available for redemption 65.00%    
Hedge Funds | Forecast      
Investments [Line Items]      
Percentage available for redemption   35.00%  
Private equity funds      
Investments [Line Items]      
Alternative investments $ 8,600   8,428
Other invested assets $ 10,500   $ 10,400
[1] See Note 9 for details of balances associated with variable interest entities.