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Level 4- Fair Value by Hierarchy (Details) - USD ($) $ in Millions | Mar. 31, 2018 | Dec. 31, 2017
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Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | $ 35,924 | $ 36,964
Fixed maturities, FVO | 38 | 41
Marketable Securities | 1,123 | 0
Available-for-sale Securities, Equity Securities | 0 | 1,012
Derivative assets | 12 | 10
Short-term investments | 2,385 | 2,270
Total assets accounted for at fair value on a recurring basis | 39,482 | 40,297
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (86) | (100)
Contingent consideration | (27) | (29)
Total liabilities accounted for at fair value on a recurring basis | (113) | (129)
Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 11 | 9
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 1 | (3)
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)
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (21) | (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 | (66) | (84)
Asset backed securities (ABS) |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 911 | 1,126
Collateralized debt obligations (CDOs) |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,144 | 1,260
Commercial mortgage-backed securities (CMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 3,311 | 3,336
Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 12,634 | 12,804
Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,082 | 1,110
Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 11,544 | 12,485
Residential mortgage-backed securities (RMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 3,086 | 3,044
U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 2,212 | 1,799
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 458 | 333
Fixed maturities, FVO | 0 | 0
Available-for-sale Securities, Equity Securities | 1,009 | 887
Short-term investments | 874 | 1,098
Total assets accounted for at fair value on a recurring basis | 2,341 | 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
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
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 |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 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 |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 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 |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 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 |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 0 | 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 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 |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 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 |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 458 | 333
Significant Observable Inputs (Level 2) |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 33,547 | 34,679
Fixed maturities, FVO | 38 | 41
Available-for-sale Securities, Equity Securities | 49 | 49
Derivative assets | 11 | 9
Short-term investments | 1,511 | 1,172
Total assets accounted for at fair value on a recurring basis | 35,156 | 35,950
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (88) | (101)
Contingent consideration | 0 | 0
Total liabilities accounted for at fair value on a recurring basis | (88) | (101)
Significant Observable Inputs (Level 2) | Credit derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | 11 | 9
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 1 | (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)
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | (21) | (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 | (68) | (85)
Significant Observable Inputs (Level 2) | Asset backed securities (ABS) |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 897 | 1,107
Significant Observable Inputs (Level 2) | Collateralized debt obligations (CDOs) |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,038 | 1,165
Significant Observable Inputs (Level 2) | Commercial mortgage-backed securities (CMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 3,278 | 3,267
Significant Observable Inputs (Level 2) | Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 12,119 | 12,284
Significant Observable Inputs (Level 2) | Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,080 | 1,108
Significant Observable Inputs (Level 2) | Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 11,528 | 12,468
Significant Observable Inputs (Level 2) | Residential mortgage-backed securities (RMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,853 | 1,814
Significant Observable Inputs (Level 2) | U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,754 | 1,466
Significant Unobservable Inputs (Level 3) |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,919 | 1,952
Fixed maturities, FVO | 0 | 0
Available-for-sale Securities, Equity Securities | 65 | 76
Derivative assets | 1 | 1
Short-term investments | 0 | 0
Total assets accounted for at fair value on a recurring basis | 1,985 | 2,029
Liabilities accounted for at fair value on a recurring basis |  |
Derivative liabilities | 2 | 1
Contingent consideration | (27) | (29)
Total liabilities accounted for at fair value on a recurring basis | (25) | (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 | 1 | 1
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
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 |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 14 | 19
Significant Unobservable Inputs (Level 3) | Collateralized debt obligations (CDOs) |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 106 | 95
Significant Unobservable Inputs (Level 3) | Commercial mortgage-backed securities (CMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 33 | 69
Significant Unobservable Inputs (Level 3) | Corporate |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 515 | 520
Significant Unobservable Inputs (Level 3) | Foreign government/government agencies |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 2 | 2
Significant Unobservable Inputs (Level 3) | Municipal |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 16 | 17
Significant Unobservable Inputs (Level 3) | Residential mortgage-backed securities (RMBS) |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 1,233 | 1,230
Significant Unobservable Inputs (Level 3) | U.S. Treasuries |  |
Assets accounted for at fair value on a recurring basis |  |
Fixed maturities, available-for-sale, at fair value (amortized cost of $54,478 and $53,805) | 0 | $ 0
Other investments | Equity derivatives |  |
Assets accounted for at fair value on a recurring basis |  |
Derivative assets | $ 1 |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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