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Fair Value Measurements - Fair Value by Hierarchy (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale $ 40,205 $ 42,148
Fixed maturities, FVO 8 11
Equity securities, at fair value 1,155 1,657
Derivative assets 10 12
Short-term investments 2,505 2,921
Total assets accounted for at fair value on a recurring basis 43,883 46,749
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (66) (78)
Contingent consideration 0 (22)
Total liabilities accounted for at fair value on a recurring basis (66) (100)
Credit derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 2 11
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 3 (1)
Equity    
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities   (15)
Foreign exchange derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 8  
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 19 (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 (88) (60)
Asset-backed-securities (ABS)    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 1,348 1,476
Collateralized loan obligations (CLOs)    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 1,989 2,183
CMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 4,302 4,338
Corporate    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 16,798 17,396
Foreign government/government agencies    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 1,063 1,123
Municipal    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 9,497 9,498
RMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 4,086 4,869
U.S. Treasuries    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 1,122 1,265
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 95 330
Fixed maturities, FVO 0 0
Equity securities, at fair value 822 1,401
Derivative assets 0 0
Short-term investments 1,649 1,028
Total assets accounted for at fair value on a recurring basis 2,566 2,759
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 0 0
Contingent consideration 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) | Equity    
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  
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    
Debt Securities, Available-for-sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Collateralized loan obligations (CLOs)    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | CMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 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    
Debt Securities, Available-for-sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | RMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 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    
Debt Securities, Available-for-sale 95 330
Significant Observable Inputs (Level 2)    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 38,791 40,404
Fixed maturities, FVO 8 11
Equity securities, at fair value 264 183
Derivative assets 10 12
Short-term investments 842 1,878
Total assets accounted for at fair value on a recurring basis 39,915 42,488
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities (66) (63)
Contingent consideration 0 0
Total liabilities accounted for at fair value on a recurring basis (66) (63)
Significant Observable Inputs (Level 2) | Credit derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 2 11
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 3 (1)
Significant Observable Inputs (Level 2) | Foreign exchange derivatives    
Assets accounted for at fair value on a recurring basis    
Derivative assets 8  
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 19 (2)
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 (88) (60)
Significant Observable Inputs (Level 2) | Asset-backed-securities (ABS)    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 1,329 1,461
Significant Observable Inputs (Level 2) | Collateralized loan obligations (CLOs)    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 1,906 2,088
Significant Observable Inputs (Level 2) | CMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 4,284 4,329
Significant Observable Inputs (Level 2) | Corporate    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 16,089 16,664
Significant Observable Inputs (Level 2) | Foreign government/government agencies    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 1,060 1,120
Significant Observable Inputs (Level 2) | Municipal    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 9,497 9,498
Significant Observable Inputs (Level 2) | RMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 3,599 4,309
Significant Observable Inputs (Level 2) | U.S. Treasuries    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 1,027 935
Significant Unobservable Inputs (Level 3)    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 1,319 1,414
Fixed maturities, FVO 0 0
Equity securities, at fair value 69 73
Derivative assets 0 0
Short-term investments 14 15
Total assets accounted for at fair value on a recurring basis 1,402 1,502
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities 0 (15)
Contingent consideration 0 (22)
Total liabilities accounted for at fair value on a recurring basis 0 (37)
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) | Equity    
Liabilities accounted for at fair value on a recurring basis    
Derivative liabilities   (15)
Significant Unobservable Inputs (Level 3) | Foreign exchange 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) | 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    
Debt Securities, Available-for-sale 19 15
Significant Unobservable Inputs (Level 3) | Collateralized loan obligations (CLOs)    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 83 95
Significant Unobservable Inputs (Level 3) | CMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 18 9
Significant Unobservable Inputs (Level 3) | Corporate    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 709 732
Significant Unobservable Inputs (Level 3) | Foreign government/government agencies    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 3 3
Significant Unobservable Inputs (Level 3) | Municipal    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 0 0
Significant Unobservable Inputs (Level 3) | RMBS    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 487 560
Significant Unobservable Inputs (Level 3) | U.S. Treasuries    
Assets accounted for at fair value on a recurring basis    
Debt Securities, Available-for-sale 0 0
Fair Value Measured at Net Asset Value Per Share [Member]    
Liabilities accounted for at fair value on a recurring basis    
Deposit Assets $ 40 $ 38