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Segment Disclosures - Analysis of Results by Operating Segment (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |  |
Sales and Other Operating Revenue | [1] | $ 32,567,000,000 | $ 36,417,000,000 | $ 29,106,000,000
Corporate, Non-Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and Other Operating Revenue |  | 221,000,000 | 168,000,000 | 104,000,000
Alaska Segment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and Other Operating Revenue |  | 5,483,000,000 | 5,740,000,000 | 4,224,000,000
Lower 48 Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and Other Operating Revenue |  | 15,514,000,000 | 17,029,000,000 | 12,968,000,000
Lower 48 Segment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and Other Operating Revenue |  | 15,468,000,000 | 16,989,000,000 | 12,964,000,000
Lower 48 Segment [Member] | Intersegment Elimination [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and Other Operating Revenue |  | (46,000,000) | (40,000,000) | (4,000,000)
Canada Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and Other Operating Revenue |  | 2,910,000,000 | 3,184,000,000 | 3,178,000,000
Canada Segment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and Other Operating Revenue |  | 1,769,000,000 | 2,024,000,000 | 2,619,000,000
Canada Segment [Member] | Intersegment Elimination [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and Other Operating Revenue |  | (1,141,000,000) | (1,160,000,000) | (559,000,000)
Europe, Middle East and North Africa Segment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and Other Operating Revenue |  | 5,101,000,000 | 6,635,000,000 | 5,181,000,000
Asia Pacific and Middle East [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and Other Operating Revenue |  | 4,525,000,000 | 4,861,000,000 | 4,014,000,000
Other International Segment [Member] | Operating Segments [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and Other Operating Revenue |  | $ 0 | $ 0 | $ 0
[1] | Sales and other operating revenues are attributable to countries based on the location of the selling operation.

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