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Fair Value Measurements - Fair Value by Hierarchy (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | $ 36,964 | $ 32,182
Fixed maturities, FVO | 41 | 211
Equity securities, AFS | 1,012 | 945
Derivative assets | 10 | (415)
Short-term investments | 2,270 | 1,895
Total assets accounted for at fair value on a recurring basis | 40,297 | 34,818
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (100) | (112)
Contingent consideration | (29) | (25)
Total liabilities accounted for at fair value on a recurring basis | (129) | (137)
Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 9 | 18
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (3) | (14)
Equity derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 1 |
Foreign exchange derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | (1) | 23
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (13) | 10
Interest rate derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 1 | (457)
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (84) | (108)
Other derivative contracts |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets |  | 1
Asset backed securities (ABS) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 1,126 | 1,389
Collateralized debt obligations (CDOs) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 1,260 | 976
Commercial mortgage-backed securities (CMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 3,336 | 2,790
Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 12,804 | 10,973
Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 1,110 | 826
Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 12,485 | 10,297
Residential mortgage-backed securities (RMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 3,044 | 3,006
U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 1,799 | 1,925
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 333 | 390
Fixed maturities, FVO | 0 | 1
Equity securities, AFS | 887 | 801
Short-term investments | 1,098 | 241
Total assets accounted for at fair value on a recurring basis | 2,318 | 1,433
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 |
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) | Other derivative contracts |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets |  | 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 debt obligations (CDOs) |  |
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 | 333 | 390
Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 34,679 | 29,666
Fixed maturities, FVO | 41 | 199
Equity securities, AFS | 49 | 89
Derivative assets | 9 | (416)
Short-term investments | 1,172 | 1,654
Total assets accounted for at fair value on a recurring basis | 35,950 | 31,192
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (101) | (121)
Contingent consideration | 0 | 0
Total liabilities accounted for at fair value on a recurring basis | (101) | (121)
Significant Observable Inputs (Level 2) | Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 9 | 18
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (3) | (14)
Significant Observable Inputs (Level 2) | Equity derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 0 |
Significant Observable Inputs (Level 2) | Foreign exchange derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | (1) | 23
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (13) | 10
Significant Observable Inputs (Level 2) | Interest rate derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 1 | (457)
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (85) | (117)
Significant Observable Inputs (Level 2) | Other derivative contracts |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets |  | 0
Significant Observable Inputs (Level 2) | Asset backed securities (ABS) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 1,107 | 1,344
Significant Observable Inputs (Level 2) | Collateralized debt obligations (CDOs) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 1,165 | 822
Significant Observable Inputs (Level 2) | Commercial mortgage-backed securities (CMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 3,267 | 2,731
Significant Observable Inputs (Level 2) | Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 12,284 | 10,459
Significant Observable Inputs (Level 2) | Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 1,108 | 779
Significant Observable Inputs (Level 2) | Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 12,468 | 10,251
Significant Observable Inputs (Level 2) | Residential mortgage-backed securities (RMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 1,814 | 1,745
Significant Observable Inputs (Level 2) | U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 1,466 | 1,535
Significant Unobservable Inputs (Level 3) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 1,952 | 2,126
Fixed maturities, FVO | 0 | 11
Equity securities, AFS | 76 | 55
Derivative assets | 1 | 1
Short-term investments | 0 | 0
Total assets accounted for at fair value on a recurring basis | 2,029 | 2,193
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 1 | 9
Contingent consideration | (29) | (25)
Total liabilities accounted for at fair value on a recurring basis | (28) | (16)
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 | 1 |
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 | 9
Significant Unobservable Inputs (Level 3) | Other derivative contracts |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets |  | 1
Significant Unobservable Inputs (Level 3) | Asset backed securities (ABS) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 19 | 45
Significant Unobservable Inputs (Level 3) | Collateralized debt obligations (CDOs) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 95 | 154
Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed securities (CMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 69 | 59
Significant Unobservable Inputs (Level 3) | Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 520 | 514
Significant Unobservable Inputs (Level 3) | Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 2 | 47
Significant Unobservable Inputs (Level 3) | Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 17 | 46
Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities (RMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Total fixed maturities | 1,230 | 1,261
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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