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Investments - Carrying Amounts of Other Invested Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Investments [Line Items]    
Alternative investments $ 3,889 $ 4,032
All other investments 1,821 1,986
Total 8,361 9,828
Accumulated depreciation on investment in real estate 135 161
Hedge Funds    
Investments [Line Items]    
Total 191 187
Private equity funds    
Investments [Line Items]    
Alternative investments 3,311 3,105
Total 3,400 3,600
Alternative equity security    
Investments [Line Items]    
All other investments 300 300
Corebridge Financial Inc    
Investments [Line Items]    
Retained investment in Corebridge using fair value option $ 2,651 $ 3,810