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Investments - Fair Value of Investments in Funds at NAV and Related Unfunded Commitments (Detail) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]    
Fair Value of Investments $ 1,946 $ 2,547
Unfunded Commitments 939 955
Private equity funds    
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]    
Fair Value of Investments 463 881
Unfunded Commitments 432 432
Credit funds    
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]    
Fair Value of Investments 1,066 1,281
Unfunded Commitments 348 364
Hedge funds    
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]    
Fair Value of Investments 30 31
Unfunded Commitments 0 0
Real estate funds    
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]    
Fair Value of Investments 387 354
Unfunded Commitments $ 159 $ 159