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Fair Value Measurements - Fair Value by Hierarchy (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | $ 42,389 | $ 35,652
Fixed maturities, FVO | 39 | 22
Equity securities, at fair value | 1,414 | 1,214
Derivative assets | 12 | 7
Short-term investments | 2,927 | 4,283
Total assets accounted for at fair value on a recurring basis | 46,781 | 41,178
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (71) | (68)
Contingent consideration | (21) | (35)
Total liabilities accounted for at fair value on a recurring basis | (92) | (103)
Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 9 | 5
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (1) | (2)
Equity |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets |  | 3
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (5) | 1
Foreign exchange derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 4 | (2)
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 4 | (5)
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 | (69) | (62)
Asset-backed-securities (ABS) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,337 | 1,276
Collateralized loan obligations (CLOs) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 2,158 | 1,437
CMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 4,254 | 3,552
Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 17,801 | 13,398
Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,117 | 847
Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 9,895 | 10,346
Residential mortgage-backed securities (RMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 4,732 | 3,279
U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,095 | 1,517
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 | 7 | 330
Fixed maturities, FVO | 0 | 0
Equity securities, at fair value | 1,196 | 1,093
Derivative assets | 0 | 0
Short-term investments | 1,211 | 1,039
Total assets accounted for at fair value on a recurring basis | 2,414 | 2,462
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 |  |
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) | 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 |  |
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) | Residential mortgage-backed securities (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 | 7 | 330
Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 40,726 | 33,757
Fixed maturities, FVO | 39 | 22
Equity securities, at fair value | 148 | 44
Derivative assets | 12 | 4
Short-term investments | 1,716 | 3,244
Total assets accounted for at fair value on a recurring basis | 42,641 | 37,071
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (66) | (69)
Contingent consideration | 0 | 0
Total liabilities accounted for at fair value on a recurring basis | (66) | (69)
Significant Observable Inputs (Level 2) | Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 9 | 5
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (1) | (2)
Significant Observable Inputs (Level 2) | Equity |  |
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 | 1
Significant Observable Inputs (Level 2) | Foreign exchange derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 4 | (2)
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 4 | (5)
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 | (69) | (63)
Significant Observable Inputs (Level 2) | Asset-backed-securities (ABS) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,337 | 1,266
Significant Observable Inputs (Level 2) | Collateralized loan obligations (CLOs) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,862 | 1,337
Significant Observable Inputs (Level 2) | CMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 4,234 | 3,540
Significant Observable Inputs (Level 2) | Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 17,078 | 12,878
Significant Observable Inputs (Level 2) | Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,114 | 844
Significant Observable Inputs (Level 2) | Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 9,895 | 10,346
Significant Observable Inputs (Level 2) | Residential mortgage-backed securities (RMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 4,118 | 2,359
Significant Observable Inputs (Level 2) | U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,088 | 1,187
Significant Unobservable Inputs (Level 3) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,656 | 1,565
Fixed maturities, FVO | 0 | 0
Equity securities, at fair value | 70 | 77
Derivative assets | 0 | 3
Short-term investments | 0 | 0
Total assets accounted for at fair value on a recurring basis | 1,726 | 1,645
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (5) | 1
Contingent consideration | (21) | (35)
Total liabilities accounted for at fair value on a recurring basis | (26) | (34)
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 |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets |  | 3
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (5) | 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 |  |
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 | 1
Significant Unobservable Inputs (Level 3) | Asset-backed-securities (ABS) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 0 | 10
Significant Unobservable Inputs (Level 3) | Collateralized loan obligations (CLOs) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 296 | 100
Significant Unobservable Inputs (Level 3) | CMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 20 | 12
Significant Unobservable Inputs (Level 3) | Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 723 | 520
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) | Residential mortgage-backed securities (RMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 614 | 920
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 | $ 55 | $ 0

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