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Fair Value Measurements - Fair Value by Hierarchy (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 01, 2018
--- | --- | --- | ---
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | $ 42,148 | $ 35,652 |
Fixed maturities, FVO | 11 | 22 |
Equity securities, at fair value | 1,657 | 1,214 | $ 1,000
Derivative assets | 12 | 7 |
Short-term investments | 2,921 | 4,283 |
Total assets accounted for at fair value on a recurring basis | 46,749 | 41,178 |
Liabilities accounted for at fair value on a recurring basis |  |  |
Derivative liabilities | (78) | (68) |
Contingent consideration | (22) | (35) |
Total liabilities accounted for at fair value on a recurring basis | (100) | (103) |
Credit derivatives |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Derivative assets | 11 | 5 |
Liabilities accounted for at fair value on a recurring basis |  |  |
Derivative liabilities | (1) | (2) |
Equity derivatives |  |  |
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 | (15) | 1 |
Foreign exchange derivatives |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Derivative assets |  | (2) |
Liabilities accounted for at fair value on a recurring basis |  |  |
Derivative liabilities | (2) | (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 | (60) | (62) |
Asset backed securities (ABS) |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 1,476 | 1,276 |
Collateralized loan obligations (CLOs) |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 2,183 | 1,437 |
Commercial mortgage-backed securities (CMBS) |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 4,338 | 3,552 |
Corporate |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 17,396 | 13,398 |
Foreign government/government agencies |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 1,123 | 847 |
Municipal |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 9,498 | 10,346 |
Residential mortgage-backed securities (RMBS) |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 4,869 | 3,279 |
U.S. Treasuries |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 1,265 | 1,517 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 330 | 330 |
Fixed maturities, FVO | 0 | 0 |
Equity securities, at fair value | 1,401 | 1,093 |
Derivative assets |  | 0 |
Short-term investments | 1,028 | 1,039 |
Total assets accounted for at fair value on a recurring basis | 2,759 | 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 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) | Foreign exchange 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) | 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 | 330 |
Significant Observable Inputs (Level 2) |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 40,404 | 33,757 |
Fixed maturities, FVO | 11 | 22 |
Equity securities, at fair value | 183 | 44 |
Derivative assets | 12 | 4 |
Short-term investments | 1,878 | 3,244 |
Total assets accounted for at fair value on a recurring basis | 42,488 | 37,071 |
Liabilities accounted for at fair value on a recurring basis |  |  |
Derivative liabilities | (63) | (69) |
Contingent consideration | 0 | 0 |
Total liabilities accounted for at fair value on a recurring basis | (63) | (69) |
Significant Observable Inputs (Level 2) | Credit derivatives |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Derivative assets | 11 | 5 |
Liabilities accounted for at fair value on a recurring basis |  |  |
Derivative liabilities | (1) | (2) |
Significant Observable Inputs (Level 2) | Equity 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 | 1 |
Significant Observable Inputs (Level 2) | Foreign exchange derivatives |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Derivative assets |  | (2) |
Liabilities accounted for at fair value on a recurring basis |  |  |
Derivative liabilities | (2) | (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 | (60) | (63) |
Significant Observable Inputs (Level 2) | Asset backed securities (ABS) |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 1,461 | 1,266 |
Significant Observable Inputs (Level 2) | Collateralized loan obligations (CLOs) |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 2,088 | 1,337 |
Significant Observable Inputs (Level 2) | Commercial mortgage-backed securities (CMBS) |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 4,329 | 3,540 |
Significant Observable Inputs (Level 2) | Corporate |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 16,664 | 12,878 |
Significant Observable Inputs (Level 2) | Foreign government/government agencies |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 1,120 | 844 |
Significant Observable Inputs (Level 2) | Municipal |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 9,498 | 10,346 |
Significant Observable Inputs (Level 2) | Residential mortgage-backed securities (RMBS) |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 4,309 | 2,359 |
Significant Observable Inputs (Level 2) | U.S. Treasuries |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 935 | 1,187 |
Significant Unobservable Inputs (Level 3) |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 1,414 | 1,565 |
Fixed maturities, FVO | 0 | 0 |
Equity securities, at fair value | 73 | 77 |
Derivative assets | 0 | 3 |
Short-term investments | 15 | 0 |
Total assets accounted for at fair value on a recurring basis | 1,502 | 1,645 |
Liabilities accounted for at fair value on a recurring basis |  |  |
Derivative liabilities | (15) | 1 |
Contingent consideration | (22) | (35) |
Total liabilities accounted for at fair value on a recurring basis | (37) | (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 derivatives |  |  |
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 | (15) | 0 |
Significant Unobservable Inputs (Level 3) | Foreign exchange 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 |
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 |  |  |
Total fixed maturities | 15 | 10 |
Significant Unobservable Inputs (Level 3) | Collateralized loan obligations (CLOs) |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 95 | 100 |
Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed securities (CMBS) |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 9 | 12 |
Significant Unobservable Inputs (Level 3) | Corporate |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 732 | 520 |
Significant Unobservable Inputs (Level 3) | Foreign government/government agencies |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 3 | 3 |
Significant Unobservable Inputs (Level 3) | Municipal |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 0 | 0 |
Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities (RMBS) |  |  |
Assets accounted for at fair value on a recurring basis |  |  |
Total fixed maturities | 560 | 920 |
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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