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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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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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