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Fair Value Measurements - Fair Value by Hierarchy (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | $ 36,166 | $ 36,964
Fixed maturities, FVO | 24 | 41
Equity securities, at fair value | 1,035 | 0
Equity securities, AFS | 0 | 1,012
Derivative assets | 14 | 10
Short-term investments | 3,540 | 2,270
Total assets accounted for at fair value on a recurring basis | 40,779 | 40,297
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (61) | (100)
Contingent consideration | (32) | (29)
Total liabilities accounted for at fair value on a recurring basis | (93) | (129)
Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 14 | 9
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities |  | (3)
Equity derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 1 | 1
Foreign exchange 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 | (10) | (13)
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 | (51) | (84)
Asset-backed-securities (ABS) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,191 | 1,126
Collateralized loan obligations (CLOs) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,326 | 1,260
CMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 3,657 | 3,336
Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 13,492 | 12,804
Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 952 | 1,110
Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 10,602 | 12,485
Residential mortgage-backed securities (RMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 3,118 | 3,044
U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,828 | 1,799
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 | 695 | 333
Fixed maturities, FVO | 0 | 0
Equity securities, at fair value | 905 |
Equity securities, AFS |  | 887
Short-term investments | 980 | 1,098
Total assets accounted for at fair value on a recurring basis | 2,580 | 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
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
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
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 | 695 | 333
Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 33,602 | 34,679
Fixed maturities, FVO | 24 | 41
Equity securities, at fair value | 52 |
Equity securities, AFS |  | 49
Derivative assets | 13 | 9
Short-term investments | 2,560 | 1,172
Total assets accounted for at fair value on a recurring basis | 36,251 | 35,950
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (63) | (101)
Contingent consideration | 0 | 0
Total liabilities accounted for at fair value on a recurring basis | (63) | (101)
Significant Observable Inputs (Level 2) | Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 14 | 9
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities |  | (3)
Significant Observable Inputs (Level 2) | Equity derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 0 | 0
Significant Observable Inputs (Level 2) | Foreign exchange 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 | (10) | (13)
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 | (53) | (85)
Significant Observable Inputs (Level 2) | Asset-backed-securities (ABS) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,137 | 1,107
Significant Observable Inputs (Level 2) | Collateralized loan obligations (CLOs) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,030 | 1,165
Significant Observable Inputs (Level 2) | CMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 3,635 | 3,267
Significant Observable Inputs (Level 2) | Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 12,941 | 12,284
Significant Observable Inputs (Level 2) | Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 949 | 1,108
Significant Observable Inputs (Level 2) | Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 10,593 | 12,468
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 | 2,184 | 1,814
Significant Observable Inputs (Level 2) | U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,133 | 1,466
Significant Unobservable Inputs (Level 3) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,869 | 1,952
Fixed maturities, FVO | 0 | 0
Equity securities, at fair value | 78 |
Equity securities, AFS |  | 76
Derivative assets | 1 | 1
Short-term investments | 0 | 0
Total assets accounted for at fair value on a recurring basis | 1,948 | 2,029
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 2 | 1
Contingent consideration | (32) | (29)
Total liabilities accounted for at fair value on a recurring basis | (30) | (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
Significant Unobservable Inputs (Level 3) | Equity derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 1 | 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
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 2 | 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 | 54 | 19
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 | 95
Significant Unobservable Inputs (Level 3) | CMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 22 | 69
Significant Unobservable Inputs (Level 3) | Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 551 | 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 | 2
Significant Unobservable Inputs (Level 3) | Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 9 | 17
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 | 934 | 1,230
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

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