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Investment Information - Other investments, at fair value (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Schedule Of Other Investments [Line Items]    
Other investments, at fair value $ 2,888 $ 3,066
Other investments    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 1,866 2,135
Investment grade fixed income    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 1,085 1,055
Private equity    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 252 229
Lending    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 237 303
Term loan investments    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 200 430
Credit related funds    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 74 99
Energy    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 18 19
Fixed maturities    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 913 854
Short term investments    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 104 70
Equity securities    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value $ 5 $ 7