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Impairments (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |
Asset Impairment Charges | $ 44 | $ 6 | $ 21 | $ 6,475
Alaska [Member] | Operating Segments [Member] |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |
Asset Impairment Charges | 0 | 1 | 0 | 178
Lower 48 [Member] | Operating Segments [Member] |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |
Asset Impairment Charges | 44 | 3 | 55 | 3,888
Canada | Operating Segments [Member] |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |
Asset Impairment Charges | 0 | 0 | 0 | 18
Europe and North Africa [Member] | Operating Segments [Member] |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |
Asset Impairment Charges | 0 | 2 | (48) | 7
Asia Pacific and Middle East [Member] | Operating Segments [Member] |  |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |  |
Asset Impairment Charges | $ 0 | $ 0 | $ 14 | $ 2,384

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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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