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Fair Value Measurements - Investments in Certain Other Invested Assets (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2024
Dec. 31, 2023
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using NAV Per Share (or its equivalent) $ 4,334 $ 4,345
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) 3,350 3,799
Unfunded Commitments 1,468 1,081
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) 3,162 3,388
Unfunded Commitments $ 1,468 1,081
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) $ 1,219 1,171
Unfunded Commitments 783 558
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) 693 870
Unfunded Commitments 337 344
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) 102 67
Unfunded Commitments 92 50
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) 205 196
Unfunded Commitments 0 9
Mezzanine    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using NAV Per Share (or its equivalent) 101 140
Unfunded Commitments 91 56
Other    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Fair Value Using NAV Per Share (or its equivalent) 842 944
Unfunded Commitments 165 64
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) 188 411
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 13
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) 168 389
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 9
Unfunded Commitments $ 0 $ 0