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Investments - Carrying amounts of Other Invested Assets (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Investments [Line Items]    
Alternative investments $ 11,195 $ 11,320
Investment real estate 2,159 2,237
All other investments 2,623 2,660
Total [1] 15,977 16,217
Accumulated depreciation on investment in real estate 834 853
Hedge Funds    
Investments [Line Items]    
Total 700 700
Private equity funds    
Investments [Line Items]    
Alternative investments 8,835 8,798
Total 10,500 10,600
Fortitude Re Funds Withheld Assets    
Investments [Line Items]    
Total 156 156
DaVinciRe Holdings Ltd    
Investments [Line Items]    
Total $ 300 $ 300
[1] See Note 10 for details of balances associated with variable interest entities.