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Operating Segments and Geographic Data - Segment Revenues (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Segment Reporting Information [Line Items]    
Sales and other operating revenues $ 48,842 $ 52,314
Oil and Gas    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 48,842 52,314
Oil and Gas | Operating Segments    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 59,423 64,279
Oil and Gas | All Other    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 109 83
Oil and Gas | Total All Other    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 30 16
Oil and Gas | United States | Operating Segments    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 29,121 31,170
Oil and Gas | United States | Intersegment Eliminations    
Segment Reporting Information [Line Items]    
Sales and other operating revenues (79) (67)
Oil and Gas | United States | All Other    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 108 83
Oil and Gas | United States | Intersegment Eliminations    
Segment Reporting Information [Line Items]    
Sales and other operating revenues (7,546) (7,985)
Oil and Gas | International | Operating Segments    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 30,302 33,109
Oil and Gas | International | Intersegment Eliminations    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 0 0
Oil and Gas | International | All Other    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 1 0
Oil and Gas | International | Intersegment Eliminations    
Segment Reporting Information [Line Items]    
Sales and other operating revenues (3,035) (3,980)
Oil and Gas | Upstream    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 12,311 14,250
Oil and Gas | Upstream | Operating Segments    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 20,819 24,818
Oil and Gas | Upstream | United States | Operating Segments    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 9,623 11,316
Oil and Gas | Upstream | United States | Intersegment Eliminations    
Segment Reporting Information [Line Items]    
Sales and other operating revenues (5,902) (6,919)
Oil and Gas | Upstream | International | Operating Segments    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 11,196 13,502
Oil and Gas | Upstream | International | Intersegment Eliminations    
Segment Reporting Information [Line Items]    
Sales and other operating revenues (2,606) (3,649)
Oil and Gas | Downstream    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 36,501 38,048
Oil and Gas | Downstream | Operating Segments    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 38,495 39,378
Oil and Gas | Downstream | United States | Operating Segments    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 19,390 19,771
Oil and Gas | Downstream | United States | Intersegment Eliminations    
Segment Reporting Information [Line Items]    
Sales and other operating revenues (1,565) (999)
Oil and Gas | Downstream | International | Operating Segments    
Segment Reporting Information [Line Items]    
Sales and other operating revenues 19,105 19,607
Oil and Gas | Downstream | International | Intersegment Eliminations    
Segment Reporting Information [Line Items]    
Sales and other operating revenues $ (429) $ (331)