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Operating Segments and Geographic Data - Segment Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Segment Reporting Information [Line Items]        
Sales and other operating revenues $ 63,508 $ 42,552 $ 181,194 $ 109,745
Oil and Gas        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 63,508 42,552 181,194 109,745
Oil and Gas | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 75,336 50,204 219,529 130,521
Oil and Gas | All Other        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 138 88 363 322
Oil and Gas | Total All Other        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 32 39 86 88
Oil and Gas | United States | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 37,383 23,445 108,793 60,269
Oil and Gas | United States | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues (106) (48) (276) (233)
Oil and Gas | United States | All Other        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 137 87 361 321
Oil and Gas | United States | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues (8,295) (4,126) (26,201) (11,388)
Oil and Gas | International | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 37,953 26,759 110,736 70,252
Oil and Gas | International | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 0 (1) (1) (1)
Oil and Gas | International | All Other        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 1 1 2 1
Oil and Gas | International | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues (3,533) (3,526) (12,134) (9,388)
Oil and Gas | Upstream        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 18,229 11,975 48,328 30,859
Oil and Gas | Upstream | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 28,469 18,636 81,749 48,767
Oil and Gas | Upstream | United States | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 13,183 7,374 38,731 19,199
Oil and Gas | Upstream | United States | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues (7,138) (3,520) (22,532) (9,631)
Oil and Gas | Upstream | International | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 15,286 11,262 43,018 29,568
Oil and Gas | Upstream | International | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues (3,102) (3,141) (10,889) (8,277)
Oil and Gas | Downstream        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 45,247 30,538 132,780 78,798
Oil and Gas | Downstream | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 46,729 31,480 137,417 81,432
Oil and Gas | Downstream | United States | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 24,063 15,984 69,701 40,749
Oil and Gas | Downstream | United States | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues (1,051) (558) (3,393) (1,524)
Oil and Gas | Downstream | International | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 22,666 15,496 67,716 40,683
Oil and Gas | Downstream | International | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues $ (431) $ (384) $ (1,244) $ (1,110)