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Fair Value Measurements - Fair Value by Hierarchy (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS $ 36,231 $ 42,847
Fixed maturities, at fair value using the fair value option ("FVO") 333 160
Equity securities, at fair value 1,801 2,094
Derivative assets 34 7
Short-term investments 3,859 3,697
Total assets accounted for at fair value on a recurring basis 42,258 48,805
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 13 (49)
Total liabilities accounted for at fair value on a recurring basis 13 (49)
Credit derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 2 2
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (2) (4)
Foreign exchange derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 32 6
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 21 0
Interest rate derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets   (1)
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (6) (45)
Asset backed securities ("ABS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 1,941 1,135
CLO    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 2,941 3,025
Commercial mortgage-backed securities ("CMBS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 3,368 4,119
Corporate    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 15,233 18,707
Foreign government/government agencies    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 547 910
Municipal    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 6,296 8,257
Residential mortgage-backed securities ("RMBS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 3,708 3,643
U.S. Treasuries    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 2,197 3,051
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 0 882
Fixed maturities, at fair value using the fair value option ("FVO") 0 0
Equity securities, at fair value 1,261 1,453
Derivative assets 0 0
Short-term investments 1,429 1,627
Total assets accounted for at fair value on a recurring basis 2,690 3,962
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 0 0
Total liabilities accounted for at fair value on a recurring basis 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Credit derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 0 0
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign exchange derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 0 0
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets   0
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset backed securities ("ABS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | CLO    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial mortgage-backed securities ("CMBS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign government/government agencies    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Residential mortgage-backed securities ("RMBS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | U.S. Treasuries    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 0 882
Significant Observable Inputs (Level 2)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 34,180 39,561
Fixed maturities, at fair value using the fair value option ("FVO") 155 0
Equity securities, at fair value 479 577
Derivative assets 34 6
Short-term investments 2,237 1,990
Total assets accounted for at fair value on a recurring basis 37,085 42,134
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 13 (48)
Total liabilities accounted for at fair value on a recurring basis 13 (48)
Significant Observable Inputs (Level 2) | Credit derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 2 2
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (2) (4)
Significant Observable Inputs (Level 2) | Foreign exchange derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 32 5
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 21 1
Significant Observable Inputs (Level 2) | Interest rate derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets   (1)
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (6) (45)
Significant Observable Inputs (Level 2) | Asset backed securities ("ABS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 1,911 1,135
Significant Observable Inputs (Level 2) | CLO    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 2,826 2,768
Significant Observable Inputs (Level 2) | Commercial mortgage-backed securities ("CMBS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 3,146 3,923
Significant Observable Inputs (Level 2) | Corporate    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 13,644 17,089
Significant Observable Inputs (Level 2) | Foreign government/government agencies    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 547 905
Significant Observable Inputs (Level 2) | Municipal    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 6,296 8,257
Significant Observable Inputs (Level 2) | Residential mortgage-backed securities ("RMBS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 3,613 3,315
Significant Observable Inputs (Level 2) | U.S. Treasuries    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 2,197 2,169
Significant Unobservable Inputs (Level 3)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 2,051 2,404
Fixed maturities, at fair value using the fair value option ("FVO") 178 160
Equity securities, at fair value 61 64
Derivative assets 0 1
Short-term investments 193 80
Total assets accounted for at fair value on a recurring basis 2,483 2,709
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 0 (1)
Total liabilities accounted for at fair value on a recurring basis 0 (1)
Significant Unobservable Inputs (Level 3) | Credit derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 0 0
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 0 0
Significant Unobservable Inputs (Level 3) | Foreign exchange derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 0 1
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 0 (1)
Significant Unobservable Inputs (Level 3) | Interest rate derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets   0
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 0 0
Significant Unobservable Inputs (Level 3) | Asset backed securities ("ABS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 30 0
Significant Unobservable Inputs (Level 3) | CLO    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 115 257
Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed securities ("CMBS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 222 196
Significant Unobservable Inputs (Level 3) | Corporate    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 1,589 1,618
Significant Unobservable Inputs (Level 3) | Foreign government/government agencies    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 0 5
Significant Unobservable Inputs (Level 3) | Municipal    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 0 0
Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities ("RMBS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 95 328
Significant Unobservable Inputs (Level 3) | U.S. Treasuries    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 0 0
Fair Value Measured at Net Asset Value Per Share [Member]    
Liabilities accounted for at fair value on a recurring basis    
Deposit Assets $ 62 $ 65