v3.26.1
Investments - Fair Value of Investments in Funds at NAV and Related Unfunded Commitments (Detail) - USD ($)
$ in Millions
Mar. 31, 2026
Dec. 31, 2025
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]    
Fair Value of Investments $ 1,745 $ 1,739
Unfunded Commitments 696 741
Private equity funds    
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]    
Fair Value of Investments 382 331
Unfunded Commitments 201 236
Credit funds    
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]    
Fair Value of Investments 987 999
Unfunded Commitments 337 347
Hedge funds    
Fair Value, Investments, Entities That Are Calculated Using Net Asset Value Per Share [Line Items]    
Fair Value of Investments 36 36
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 340 373
Unfunded Commitments $ 158 $ 158