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Operating Segments and Geographic Data - Segment Revenues (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Segment Reporting Information [Line Items]        
Sales and other operating revenues $ 65,372 $ 36,117 $ 117,686 $ 67,193
Oil and Gas        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 65,372 36,117 117,686 67,193
Oil and Gas | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 79,914 43,276 144,193 80,317
Oil and Gas | All Other        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 142 210 225 234
Oil and Gas | Total All Other        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 38 25 54 49
Oil and Gas | United States | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 40,240 20,155 71,410 36,824
Oil and Gas | United States | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues (103) (185) (170) (185)
Oil and Gas | United States | All Other        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 141 210 224 234
Oil and Gas | United States | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues (9,921) (3,941) (17,906) (7,262)
Oil and Gas | International | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 39,674 23,121 72,783 43,493
Oil and Gas | International | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues (1) 0 (1) 0
Oil and Gas | International | All Other        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 1 0 1 0
Oil and Gas | International | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues (4,621) (3,218) (8,601) (5,862)
Oil and Gas | Upstream        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 15,849 9,533 30,099 18,884
Oil and Gas | Upstream | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 28,462 15,550 53,280 30,131
Oil and Gas | Upstream | United States | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 14,232 6,034 25,548 11,825
Oil and Gas | Upstream | United States | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues (8,475) (3,256) (15,394) (6,111)
Oil and Gas | Upstream | International | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 14,230 9,516 27,732 18,306
Oil and Gas | Upstream | International | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues (4,138) (2,761) (7,787) (5,136)
Oil and Gas | Downstream        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 49,485 26,559 87,533 48,260
Oil and Gas | Downstream | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 51,310 27,516 90,688 49,952
Oil and Gas | Downstream | United States | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 25,867 13,911 45,638 24,765
Oil and Gas | Downstream | United States | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues (1,343) (500) (2,342) (966)
Oil and Gas | Downstream | International | Operating Segments        
Segment Reporting Information [Line Items]        
Sales and other operating revenues 25,443 13,605 45,050 25,187
Oil and Gas | Downstream | International | Intersegment Eliminations        
Segment Reporting Information [Line Items]        
Sales and other operating revenues $ (482) $ (457) $ (813) $ (726)