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Fair Value Measurements - Fair Value by Hierarchy (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS $ 42,567 $ 39,818
Fixed maturities, at fair value using the fair value option ("FVO Securities") 308 327
Equity securities, at fair value 603 864
Derivative assets 57 (1)
Short-term investments 4,068 3,850
Total assets accounted for at fair value on a recurring basis 47,603 44,858
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (12) 8
Total liabilities accounted for at fair value on a recurring basis $ (12) $ 8
Equity Security, FV-NI, Contractual Sale Restriction, Nature of Restriction and Circumstance for Lapse Level 3 includes investments that have contractual sales restrictions that require consent to sell and are in place for the duration that the securities are held by the Company. Level 3 includes investments that have contractual sales restrictions that require consent to sell and are in place for the duration that the securities are held by the Company.
Credit derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets $ 30 $ (10)
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (30) 10
Foreign exchange derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 23 9
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 18 4
Interest rate derivatives    
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities   (6)
Equity derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 4  
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 57 18
Fixed maturities, at fair value using the fair value option ("FVO Securities") 0 0
Equity securities, at fair value 372 333
Derivative assets 0 0
Short-term investments 1,271 1,400
Total assets accounted for at fair value on a recurring basis 1,700 1,751
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    
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities   0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 0  
Significant Observable Inputs (Level 2)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 39,900 37,563
Fixed maturities, at fair value using the fair value option ("FVO Securities") 111 160
Equity securities, at fair value 144 473
Derivative assets 57 (1)
Short-term investments 2,699 2,425
Total assets accounted for at fair value on a recurring basis 42,911 40,620
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (12) 8
Total liabilities accounted for at fair value on a recurring basis (12) 8
Significant Observable Inputs (Level 2) | Credit derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 30 (10)
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (30) 10
Significant Observable Inputs (Level 2) | Foreign exchange derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 23 9
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 18 4
Significant Observable Inputs (Level 2) | Interest rate derivatives    
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities   (6)
Significant Observable Inputs (Level 2) | Equity derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 4  
Significant Unobservable Inputs (Level 3)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 2,610 2,237
Fixed maturities, at fair value using the fair value option ("FVO Securities") 197 167
Equity securities, at fair value 87 58
Derivative assets 0 0
Short-term investments 98 25
Total assets accounted for at fair value on a recurring basis 2,992 2,487
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
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 0
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 0 0
Significant Unobservable Inputs (Level 3) | Interest rate derivatives    
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities   0
Significant Unobservable Inputs (Level 3) | Equity derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 0  
Fair Value Measured at Net Asset Value Per Share [Member]    
Liabilities accounted for at fair value on a recurring basis    
Deposit Assets 61 75
Asset-backed securities ("ABS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 3,937 3,320
Asset-backed securities ("ABS") | 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 0
Asset-backed securities ("ABS") | Significant Observable Inputs (Level 2)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 3,915 3,320
Asset-backed securities ("ABS") | Significant Unobservable Inputs (Level 3)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 22 0
Collateralized Loan Obligations [Member]    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 3,250 3,090
Fixed maturities, at fair value using the fair value option ("FVO Securities")   327
Collateralized Loan Obligations [Member] | 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 0
Collateralized Loan Obligations [Member] | Significant Observable Inputs (Level 2)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 3,134 2,977
Collateralized Loan Obligations [Member] | Significant Unobservable Inputs (Level 3)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 116 113
Commercial mortgage-backed securities ("CMBS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 2,736 3,125
Commercial mortgage-backed securities ("CMBS") | 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 0
Commercial mortgage-backed securities ("CMBS") | Significant Observable Inputs (Level 2)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 2,569 2,898
Commercial mortgage-backed securities ("CMBS") | Significant Unobservable Inputs (Level 3)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 167 227
Corporate    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 20,636 17,866
Corporate | 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 0
Corporate | Significant Observable Inputs (Level 2)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 18,355 16,005
Corporate | Significant Unobservable Inputs (Level 3)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 2,281 1,861
Foreign government/government agencies    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 480 562
Foreign government/government agencies | 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 0
Foreign government/government agencies | Significant Observable Inputs (Level 2)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 480 562
Foreign government/government agencies | Significant Unobservable Inputs (Level 3)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 0 0
Municipal    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 5,304 6,039
Municipal | 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 0
Municipal | Significant Observable Inputs (Level 2)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 5,304 6,039
Municipal | Significant Unobservable Inputs (Level 3)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 0 0
Residential mortgage-backed securities ("RMBS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 5,230 4,287
Residential mortgage-backed securities ("RMBS") | 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 0
Residential mortgage-backed securities ("RMBS") | Significant Observable Inputs (Level 2)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 5,206 4,251
Residential mortgage-backed securities ("RMBS") | Significant Unobservable Inputs (Level 3)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 24 36
U.S. Treasuries    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 994 1,529
U.S. Treasuries | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 57 18
U.S. Treasuries | Significant Observable Inputs (Level 2)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS 937 1,511
U.S. Treasuries | Significant Unobservable Inputs (Level 3)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities, AFS $ 0 $ 0