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Operating Segments and Geographic Data - Segment Revenues (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Sales and other operating revenues	$ 31,076	$ 29,705
Oil and Gas
Segment Reporting Information [Line Items]
Sales and other operating revenues	31,076	29,705
Oil and Gas | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	37,041	37,050
Oil and Gas | All Other
Segment Reporting Information [Line Items]
Sales and other operating revenues	24	212
Oil and Gas | Total All Other
Segment Reporting Information [Line Items]
Sales and other operating revenues	24	65
Oil and Gas | United States | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	16,669	15,862
Oil and Gas | United States | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues	0	(145)
Oil and Gas | United States | All Other
Segment Reporting Information [Line Items]
Sales and other operating revenues	24	210
Oil and Gas | United States | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues	(3,321)	(4,217)
Oil and Gas | International | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	20,372	21,188
Oil and Gas | International | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues	0	(2)
Oil and Gas | International | All Other
Segment Reporting Information [Line Items]
Sales and other operating revenues	0	2
Oil and Gas | International | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues	(2,644)	(3,128)
Oil and Gas | Upstream
Segment Reporting Information [Line Items]
Sales and other operating revenues	9,351	8,126
Oil and Gas | Upstream | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	14,581	13,479
Oil and Gas | Upstream | United States | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	5,791	4,466
Oil and Gas | Upstream | United States | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues	(2,855)	(2,812)
Oil and Gas | Upstream | International | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	8,790	9,013
Oil and Gas | Upstream | International | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues	(2,375)	(2,541)
Oil and Gas | Downstream
Segment Reporting Information [Line Items]
Sales and other operating revenues	21,701	21,514
Oil and Gas | Downstream | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	22,436	23,359
Oil and Gas | Downstream | United States | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	10,854	11,186
Oil and Gas | Downstream | United States | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues	(466)	(1,260)
Oil and Gas | Downstream | International | Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues	11,582	12,173
Oil and Gas | Downstream | International | Intersegment Eliminations
Segment Reporting Information [Line Items]
Sales and other operating revenues	$ (269)	$ (585)

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