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Fair Value Measurements - Investments in Certain Other Invested Assets (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2025
Dec. 31, 2024
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using NAV Per Share (or its equivalent) $ 4,133 $ 4,032
Private Equity Funds and Hedge Funds    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using NAV Per Share (or its equivalent) 3,434 3,292
Unfunded Commitments 1,172 792
Private equity funds    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using NAV Per Share (or its equivalent) 3,233 3,105
Unfunded Commitments $ 1,172 792
Average original expected lives (in years) 10 years  
Private equity funds | Minimum    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Extension period (in years) 1 year  
Private equity funds | Maximum    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Extension period (in years) 2 years  
Leveraged buyout    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using NAV Per Share (or its equivalent) $ 1,140 1,126
Unfunded Commitments 358 375
Real assets    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using NAV Per Share (or its equivalent) 797 782
Unfunded Commitments 228 261
Venture capital    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using NAV Per Share (or its equivalent) 85 83
Unfunded Commitments 37 40
Growth equity    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using NAV Per Share (or its equivalent) 182 175
Unfunded Commitments 2 1
Mezzanine    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using NAV Per Share (or its equivalent) 108 120
Unfunded Commitments 57 58
Other    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using NAV Per Share (or its equivalent) 921 819
Unfunded Commitments 490 57
Hedge funds    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using NAV Per Share (or its equivalent) 201 187
Unfunded Commitments 0 0
Event-driven    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using NAV Per Share (or its equivalent) 12 11
Unfunded Commitments 0 0
Long-short    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using NAV Per Share (or its equivalent) 181 168
Unfunded Commitments 0 0
Other    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using NAV Per Share (or its equivalent) 8 8
Unfunded Commitments $ 0 $ 0