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Investment Information - Other investments, at fair value (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Schedule Of Other Investments [Line Items]    
Other investments, at fair value $ 2,886 $ 2,488
Other investments    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 1,914 1,777
Lending    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 442 427
Investment grade fixed income    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 799 754
Term loan investments    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 344 272
Private equity    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 191 182
Credit related funds    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 120 124
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 930 683
Short term investments    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value 35 21
Equity securities    
Schedule Of Other Investments [Line Items]    
Other investments, at fair value $ 7 $ 7