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Asset Impairments (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2018
Impaired Long Lived Assets Held And Used [Line Items] |  |
Asset impairments | $ 154 | $ 154
Unproved Impairments [Member] |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |
Asset impairments |  | $ 61
Proved Asset Impairments [Member] |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |
Asset impairments | 109 |
Non-oil and Gas Asset Impairments [Member] |  |
Impaired Long Lived Assets Held And Used [Line Items] |  |
Asset impairments | $ 45 |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109226348&loc=d3e2420-110228 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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