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Fair Value Measurements - Fair Value by Hierarchy (Details) - USD ($)
$ in Millions
Dec. 31, 2021
Dec. 31, 2020
Assets accounted for at fair value on a recurring basis    
Total fixed maturities $ 42,847 $ 45,035
Equity securities, at fair value 2,094 1,438
Derivative assets 7 23
Fixed maturities, at fair value using the fair value option 160 0
Short-term investments 3,697 3,283
Total assets accounted for at fair value on a recurring basis 48,805 49,779
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (49) (84)
Total liabilities accounted for at fair value on a recurring basis (49) (84)
Credit derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 2 21
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (4)  
Foreign exchange derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 6 1
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 0 (14)
Interest rate derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets (1) 1
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (45) (70)
Asset backed securities ("ABS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 1,135 1,564
CLOs    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 3,025 2,780
Commercial mortgage-backed securities ("CMBS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 4,119 4,484
Corporate    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 18,707 20,273
Foreign government/government agencies    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 910 919
Municipal    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 8,257 9,503
Residential mortgage-backed securities ("RMBS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 3,643 4,107
U.S. Treasuries    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 3,051 1,405
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 882 529
Equity securities, at fair value 1,453 872
Derivative assets 0 0
Fixed maturities, at fair value using the fair value option 0  
Short-term investments 1,627 2,663
Total assets accounted for at fair value on a recurring basis 3,962 4,064
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  
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 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 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | CLOs    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 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 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 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 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 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 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 882 529
Significant Observable Inputs (Level 2)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 39,561 42,801
Equity securities, at fair value 577 496
Derivative assets 6 23
Fixed maturities, at fair value using the fair value option 0  
Short-term investments 1,990 590
Total assets accounted for at fair value on a recurring basis 42,134 43,910
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (48) (84)
Total liabilities accounted for at fair value on a recurring basis (48) (84)
Significant Observable Inputs (Level 2) | Credit derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 2 21
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (4)  
Significant Observable Inputs (Level 2) | Foreign exchange derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 5 1
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 1 (14)
Significant Observable Inputs (Level 2) | Interest rate derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets (1) 1
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (45) (70)
Significant Observable Inputs (Level 2) | Asset backed securities ("ABS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 1,135 1,564
Significant Observable Inputs (Level 2) | CLOs    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 2,768 2,420
Significant Observable Inputs (Level 2) | Commercial mortgage-backed securities ("CMBS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 3,923 4,407
Significant Observable Inputs (Level 2) | Corporate    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 17,089 19,392
Significant Observable Inputs (Level 2) | Foreign government/government agencies    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 905 913
Significant Observable Inputs (Level 2) | Municipal    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 8,257 9,503
Significant Observable Inputs (Level 2) | Residential mortgage-backed securities ("RMBS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 3,315 3,726
Significant Observable Inputs (Level 2) | U.S. Treasuries    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 2,169 876
Significant Unobservable Inputs (Level 3)    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 2,404 1,705
Equity securities, at fair value 64 70
Derivative assets 1 0
Fixed maturities, at fair value using the fair value option 160  
Short-term investments 80 30
Total assets accounted for at fair value on a recurring basis 2,709 1,805
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (1) 0
Total liabilities accounted for at fair value on a recurring basis (1) 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  
Significant Unobservable Inputs (Level 3) | Foreign exchange derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 1 0
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (1) 0
Significant Unobservable Inputs (Level 3) | Interest rate 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) | Asset backed securities ("ABS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 0 0
Significant Unobservable Inputs (Level 3) | CLOs    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 257 360
Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed securities ("CMBS")    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 196 77
Significant Unobservable Inputs (Level 3) | Corporate    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 1,618 881
Significant Unobservable Inputs (Level 3) | Foreign government/government agencies    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 5 6
Significant Unobservable Inputs (Level 3) | Municipal    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 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 328 381
Significant Unobservable Inputs (Level 3) | U.S. Treasuries    
Assets accounted for at fair value on a recurring basis    
Total fixed maturities 0 0
Fair Value Measured at Net Asset Value Per Share [Member]    
Liabilities accounted for at fair value on a recurring basis    
Deposit Assets $ 65 $ 54