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Investments - Carrying amounts of other invested assets (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Investments [Line Items]    
Investment real estate $ 2,208 $ 2,153
All other investments 2,203 1,991
Other invested assets [1] 16,054 15,953
Accumulated depreciation on investment in real estate 820 786
Fortitude Re Funds Withheld Assets    
Investments [Line Items]    
Other invested assets 156 156
Hedge Funds and Private Equity Funds    
Investments [Line Items]    
Alternative investments 11,643 11,809
Hedge Funds    
Investments [Line Items]    
Other invested assets 900 1,400
Private equity funds    
Investments [Line Items]    
Alternative investments 8,779 8,428
Other invested assets $ 10,800 $ 10,400
[1] See Note 10 for details of balances associated with variable interest entities.