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Impairments (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |
Asset Impairment Charges | $ 405 | $ 27 | $ 6,601
Alaska Segment [Member] | Operating Segments [Member] |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |
Asset Impairment Charges | 0 | 20 | 180
Lower 48 Segment [Member] | Operating Segments [Member] |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |
Asset Impairment Charges | 402 | 63 | 3,969
Canada Segment [Member] | Operating Segments [Member] |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |
Asset Impairment Charges | 2 | 9 | 22
Europe, Middle East and North Africa Segment [Member] | Operating Segments [Member] |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |
Asset Impairment Charges | 1 | (79) | 46
Asia Pacific Segment [Member] | Operating Segments [Member] |  |  |
Impaired Assets to be Disposed of by Method Other than Sale [Line Items] |  |  |
Asset Impairment Charges | $ 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=121586364&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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