v3.25.4
Investments - Fair Value of Investments in Funds at NAV and Related Unfunded Commitments (Detail) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]    
Fair Value of Investments $ 1,739 $ 2,547
Unfunded Commitments 741 955
Private equity funds    
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]    
Fair Value of Investments 331 881
Unfunded Commitments 236 432
Credit funds    
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]    
Fair Value of Investments 999 1,281
Unfunded Commitments 347 364
Hedge funds    
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]    
Fair Value of Investments 36 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 373 354
Unfunded Commitments $ 158 $ 159