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Fair Value Measurements - Fair Value by Hierarchy (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | $ 35,652 | $ 36,964
Fixed maturities, FVO | 22 | 41
Equity Securities, FV-NI | 1,214 | 0
Equity securities, at fair value | 0 | 1,012
Derivative assets | 7 | 10
Short-term investments | 4,283 | 2,270
Total assets accounted for at fair value on a recurring basis | 41,178 | 40,297
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (68) | (100)
Contingent consideration | (35) | (29)
Total liabilities accounted for at fair value on a recurring basis | (103) | (129)
Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 5 | 9
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (2) | (3)
Equity derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 3 | 1
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities |  | 1
Foreign exchange derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | (2) | (1)
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (5) | (13)
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 | (62) | (84)
Asset backed securities (ABS) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 1,276 | 1,126
Collateralized loan obligations (CLOs) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 1,437 | 1,260
Commercial mortgage-backed securities (CMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 3,552 | 3,336
Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 13,398 | 12,804
Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 847 | 1,110
Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 10,346 | 12,485
Residential mortgage-backed securities (RMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 3,279 | 3,044
U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 1,517 | 1,799
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 330 | 333
Fixed maturities, FVO | 0 | 0
Equity Securities, FV-NI | 1,093 |
Equity securities, at fair value |  | 887
Short-term investments | 1,039 | 1,098
Total assets accounted for at fair value on a recurring basis | 2,462 | 2,318
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 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) | Collateralized loan obligations (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 | 330 | 333
Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 33,757 | 34,679
Fixed maturities, FVO | 22 | 41
Equity Securities, FV-NI | 44 |
Equity securities, at fair value |  | 49
Derivative assets | 4 | 9
Short-term investments | 3,244 | 1,172
Total assets accounted for at fair value on a recurring basis | 37,071 | 35,950
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (69) | (101)
Contingent consideration | 0 | 0
Total liabilities accounted for at fair value on a recurring basis | (69) | (101)
Significant Observable Inputs (Level 2) | Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 5 | 9
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (2) | (3)
Significant Observable Inputs (Level 2) | Equity 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 | 1 |
Significant Observable Inputs (Level 2) | Foreign exchange derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | (2) | (1)
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (5) | (13)
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 | (63) | (85)
Significant Observable Inputs (Level 2) | Asset backed securities (ABS) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 1,266 | 1,107
Significant Observable Inputs (Level 2) | Collateralized loan obligations (CLOs) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 1,337 | 1,165
Significant Observable Inputs (Level 2) | Commercial mortgage-backed securities (CMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 3,540 | 3,267
Significant Observable Inputs (Level 2) | Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 12,878 | 12,284
Significant Observable Inputs (Level 2) | Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 844 | 1,108
Significant Observable Inputs (Level 2) | Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 10,346 | 12,468
Significant Observable Inputs (Level 2) | Residential mortgage-backed securities (RMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 2,359 | 1,814
Significant Observable Inputs (Level 2) | U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 1,187 | 1,466
Significant Unobservable Inputs (Level 3) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 1,565 | 1,952
Fixed maturities, FVO | 0 | 0
Equity Securities, FV-NI | 77 |
Equity securities, at fair value |  | 76
Derivative assets | 3 | 1
Short-term investments | 0 | 0
Total assets accounted for at fair value on a recurring basis | 1,645 | 2,029
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 1 | 1
Contingent consideration | (35) | (29)
Total liabilities accounted for at fair value on a recurring basis | (34) | (28)
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 derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 3 | 1
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 | 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 | 1 | 1
Significant Unobservable Inputs (Level 3) | Asset backed securities (ABS) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 10 | 19
Significant Unobservable Inputs (Level 3) | Collateralized loan obligations (CLOs) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 100 | 95
Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed securities (CMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 12 | 69
Significant Unobservable Inputs (Level 3) | Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 520 | 520
Significant Unobservable Inputs (Level 3) | Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 3 | 2
Significant Unobservable Inputs (Level 3) | Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 0 | 17
Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities (RMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 920 | 1,230
Significant Unobservable Inputs (Level 3) | U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | $ 0 | $ 0

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