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Investment Information - Other investments, at fair value (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Schedule Of Other Investments [Line Items]    
Other investments, at fair value $ 3,261 $ 2,488
Other investments    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 2,096 1,777
Lending    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 957 754
Investment grade fixed income    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 499 272
Term loan investments    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 299 427
Private equity    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 212 182
Credit related funds    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 111 124
Energy    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 18 18
Fixed maturities    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 1,097 683
Short term investments    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 61 21
Equity securities    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value $ 7 $ 7