v3.23.1
Fair Value Measurements - Investments in certain other invested assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Private Equity Funds and Hedge Funds    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Private equity funds/hedge funds $ 6,047 $ 5,212
Unfunded Commitments 2,788 2,358
Private equity funds    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Private equity funds/hedge funds 5,163 4,310
Unfunded Commitments $ 2,788 2,358
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    
Private equity funds/hedge funds $ 2,014 1,762
Unfunded Commitments 1,719 1,229
Real estate    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Private equity funds/hedge funds 1,082 490
Unfunded Commitments 549 365
Venture capital    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Private equity funds/hedge funds 212 194
Unfunded Commitments 118 135
Growth equity    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Private equity funds/hedge funds 510 637
Unfunded Commitments 40 37
Mezzanine    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Private equity funds/hedge funds 443 306
Unfunded Commitments 78 268
Other    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Private equity funds/hedge funds 902 921
Unfunded Commitments 284 324
Hedge funds    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Private equity funds/hedge funds 884 902
Unfunded Commitments 0 0
Event-driven    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Private equity funds/hedge funds 5 18
Unfunded Commitments 0 0
Long-short    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Private equity funds/hedge funds 335 404
Unfunded Commitments 0 0
Macro    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Private equity funds/hedge funds 366 370
Unfunded Commitments 0 0
Other    
INVESTMENTS IN CERTAIN ENTITIES CARRIED AT FAIR VALUE USING NET ASSET VALUE PER SHARE    
Private equity funds/hedge funds 178 110
Unfunded Commitments $ 0 $ 0