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Operating Segments and Geographic Data - Segment Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | $ 36,117 | $ 15,926 | $ 67,193 | $ 45,631
Oil and Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 36,117 | 15,926 | 67,193 | 45,631
Oil and Gas | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 43,276 | 19,085 | 80,317 | 56,135
Oil and Gas | All Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 210 | 233 | 234 | 445
Oil and Gas | Total All Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 25 | 33 | 49 | 98
Oil and Gas | United States | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 20,155 | 8,006 | 36,824 | 23,868
Oil and Gas | United States | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | (185) | (194) | (185) | (339)
Oil and Gas | United States | All Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 210 | 227 | 234 | 437
Oil and Gas | United States | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | (3,941) | (1,946) | (7,262) | (6,163)
Oil and Gas | International | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 23,121 | 11,079 | 43,493 | 32,267
Oil and Gas | International | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 0 | (6) | 0 | (8)
Oil and Gas | International | All Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 0 | 6 | 0 | 8
Oil and Gas | International | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | (3,218) | (1,213) | (5,862) | (4,341)
Oil and Gas | Upstream |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 9,533 | 4,657 | 18,884 | 12,783
Oil and Gas | Upstream | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 15,550 | 7,098 | 30,131 | 20,577
Oil and Gas | Upstream | United States | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 6,034 | 2,544 | 11,825 | 7,010
Oil and Gas | Upstream | United States | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | (3,256) | (1,420) | (6,111) | (4,232)
Oil and Gas | Upstream | International | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 9,516 | 4,554 | 18,306 | 13,567
Oil and Gas | Upstream | International | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | (2,761) | (1,021) | (5,136) | (3,562)
Oil and Gas | Downstream |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 26,559 | 11,236 | 48,260 | 32,750
Oil and Gas | Downstream | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 27,516 | 11,754 | 49,952 | 35,113
Oil and Gas | Downstream | United States | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 13,911 | 5,235 | 24,765 | 16,421
Oil and Gas | Downstream | United States | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | (500) | (332) | (966) | (1,592)
Oil and Gas | Downstream | International | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 13,605 | 6,519 | 25,187 | 18,692
Oil and Gas | Downstream | International | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | $ (457) | $ (186) | $ (726) | $ (771)

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