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Operating Segments and Geographic Data - Segment Revenues (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | $ 42,552 | $ 23,997 | $ 109,745 | $ 69,628
Oil and Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 42,552 | 23,997 | 109,745 | 69,628
Oil and Gas | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 50,204 | 28,285 | 130,521 | 84,420
Oil and Gas | All Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 88 | 211 | 322 | 656
Oil and Gas | Total All Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 39 | 37 | 88 | 135
Oil and Gas | United States | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 23,445 | 11,722 | 60,269 | 35,590
Oil and Gas | United States | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | (48) | (171) | (233) | (510)
Oil and Gas | United States | All Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 87 | 208 | 321 | 645
Oil and Gas | United States | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | (4,126) | (2,394) | (11,388) | (8,557)
Oil and Gas | International | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 26,759 | 16,563 | 70,252 | 48,830
Oil and Gas | International | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | (1) | (3) | (1) | (11)
Oil and Gas | International | All Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 1 | 3 | 1 | 11
Oil and Gas | International | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | (3,526) | (1,894) | (9,388) | (6,235)
Oil and Gas | Upstream |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 11,975 | 5,701 | 30,859 | 18,484
Oil and Gas | Upstream | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 18,636 | 9,278 | 48,767 | 29,855
Oil and Gas | Upstream | United States | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 7,374 | 3,367 | 19,199 | 10,377
Oil and Gas | Upstream | United States | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | (3,520) | (1,916) | (9,631) | (6,148)
Oil and Gas | Upstream | International | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 11,262 | 5,911 | 29,568 | 19,478
Oil and Gas | Upstream | International | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | (3,141) | (1,661) | (8,277) | (5,223)
Oil and Gas | Downstream |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 30,538 | 18,259 | 78,798 | 51,009
Oil and Gas | Downstream | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 31,480 | 18,796 | 81,432 | 53,909
Oil and Gas | Downstream | United States | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 15,984 | 8,147 | 40,749 | 24,568
Oil and Gas | Downstream | United States | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | (558) | (307) | (1,524) | (1,899)
Oil and Gas | Downstream | International | Operating Segments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | 15,496 | 10,649 | 40,683 | 29,341
Oil and Gas | Downstream | International | Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales and other operating revenues | $ (384) | $ (230) | $ (1,110) | $ (1,001)

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