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Segment Disclosures and Related Information - Sales (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | $ 9,449,000,000 | $ 6,688,000,000 | $ 26,751,000,000 | $ 20,987,000,000
Natural Gas [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 2,503,000,000 | 2,496,000,000 | 7,593,000,000 | 7,949,000,000
Natural Gas Liquids Reserves [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 351,000,000 | 238,000,000 | 847,000,000 | 745,000,000
Crude Oil [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 5,277,000,000 | 2,947,000,000 | 14,503,000,000 | 9,387,000,000
Other Products [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 1,318,000,000 | 1,007,000,000 | 3,808,000,000 | 2,906,000,000
U.S. |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 6,025,000,000 | 4,038,000,000 | 16,617,000,000 | 12,440,000,000
Australia |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 515,000,000 | 323,000,000 | 1,258,000,000 | 1,050,000,000
Canada |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 427,000,000 | 544,000,000 | 1,583,000,000 | 2,027,000,000
China |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 262,000,000 | 148,000,000 | 616,000,000 | 511,000,000
Indonesia |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 234,000,000 | 191,000,000 | 662,000,000 | 554,000,000
Malaysia |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 339,000,000 | 297,000,000 | 1,039,000,000 | 768,000,000
Norway |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 734,000,000 | 583,000,000 | 2,112,000,000 | 1,751,000,000
United Kingdom |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 574,000,000 | 437,000,000 | 1,911,000,000 | 1,498,000,000
Libya |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues | [1] | 264,000,000 | 91,000,000 | 802,000,000 | 315,000,000
Other Non US Countries |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 75,000,000 | 36,000,000 | 151,000,000 | 73,000,000
Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 9,449,000,000 | 6,688,000,000 | 26,751,000,000 | 20,987,000,000
Alaska [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 1,493,000,000 | 932,000,000 | 4,281,000,000 | 3,010,000,000
Lower 48 [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 4,543,000,000 | 3,102,000,000 | 12,347,000,000 | 9,422,000,000
Lower 48 [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 4,529,000,000 | 3,100,000,000 | 12,329,000,000 | 9,415,000,000
Lower 48 [Member] | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | (14,000,000) | (2,000,000) | (18,000,000) | (7,000,000)
Canada |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 735,000,000 | 699,000,000 | 2,436,000,000 | 2,357,000,000
Canada | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 427,000,000 | 544,000,000 | 1,583,000,000 | 2,027,000,000
Canada | Intersegment Eliminations [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | (308,000,000) | (155,000,000) | (853,000,000) | (330,000,000)
Europe and North Africa [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 1,574,000,000 | 1,110,000,000 | 4,826,000,000 | 3,564,000,000
Asia Pacific and Middle East [Member] | Operating Segments [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | 1,348,000,000 | 959,000,000 | 3,570,000,000 | 2,877,000,000
Corporate and Other [Member] | Corporate, Non-Segment [Member] |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Sales and other operating revenues |  | $ 78,000,000 | $ 43,000,000 | $ 162,000,000 | $ 94,000,000
[1] | Included in "Other foreign countries" in prior periods

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