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Fair Value Measurements - Fair Value by Hierarchy (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | $ 44,044 | $ 42,148
Fixed maturities, FVO | 0 | 11
Equity securities, at fair value | 819 | 1,657
Derivative assets | 12 | 12
Short-term investments | 3,399 | 2,921
Total assets accounted for at fair value on a recurring basis | 48,274 | 46,749
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (72) | (78)
Contingent consideration |  | (22)
Total liabilities accounted for at fair value on a recurring basis | (72) | (100)
Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 11 | 11
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 1 | (1)
Equity |  |
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities |  | (15)
Foreign exchange derivatives |  |
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 6 | (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 | (79) | (60)
Asset-backed-securities ("ABS") |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,490 | 1,476
Collateralized loan obligations ("CLOs") |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 2,449 | 2,183
CMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 4,444 | 4,338
Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 19,416 | 17,396
Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 984 | 1,123
Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 9,310 | 9,498
RMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 4,548 | 4,869
U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,403 | 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 | 381 | 330
Fixed maturities, FVO |  | 0
Equity securities, at fair value | 352 | 1,401
Derivative assets | 0 | 0
Short-term investments | 3,176 | 1,028
Total assets accounted for at fair value on a recurring basis | 3,909 | 2,759
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 0 | 0
Contingent consideration |  | 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 |  |
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) | 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 | 381 | 330
Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 41,977 | 40,404
Fixed maturities, FVO |  | 11
Equity securities, at fair value | 398 | 183
Derivative assets | 12 | 12
Short-term investments | 209 | 1,878
Total assets accounted for at fair value on a recurring basis | 42,596 | 42,488
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (72) | (63)
Contingent consideration |  | 0
Total liabilities accounted for at fair value on a recurring basis | (72) | (63)
Significant Observable Inputs (Level 2) | Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 11 | 11
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 1 | (1)
Significant Observable Inputs (Level 2) | Foreign exchange derivatives |  |
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 6 | (2)
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 | (79) | (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 | 1,490 | 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 | 2,308 | 2,088
Significant Observable Inputs (Level 2) | CMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 4,352 | 4,329
Significant Observable Inputs (Level 2) | Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 18,420 | 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 | 984 | 1,120
Significant Observable Inputs (Level 2) | Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 9,304 | 9,498
Significant Observable Inputs (Level 2) | RMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 4,097 | 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 | 1,022 | 935
Significant Unobservable Inputs (Level 3) |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 1,686 | 1,414
Fixed maturities, FVO |  | 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 | 1,769 | 1,502
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 0 | (15)
Contingent consideration |  | (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 |  |
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 | 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 | 0 | 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 | 141 | 95
Significant Unobservable Inputs (Level 3) | CMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 92 | 9
Significant Unobservable Inputs (Level 3) | Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 996 | 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 | 0 | 3
Significant Unobservable Inputs (Level 3) | Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 6 | 0
Significant Unobservable Inputs (Level 3) | RMBS |  |
Assets accounted for at fair value on a recurring basis |  |
Debt Securities, Available-for-sale | 451 | 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 | $ 53 | $ 38

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