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Operating Segments and Geographic Data (Details 2) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Sales and other operating revenues	[1]	$ 134,674	$ 110,215	$ 129,925
United States
Segment Reporting Information [Line Items]
Sales and other operating revenues		1,022	1,105	1,513
International
Segment Reporting Information [Line Items]
Sales and other operating revenues		26	37	42
Upstream
Segment Reporting Information [Line Items]
Sales and other operating revenues		41,922	33,145	39,827
Upstream | United States
Segment Reporting Information [Line Items]
Sales and other operating revenues		13,242	10,365	12,748
Upstream | International
Segment Reporting Information [Line Items]
Sales and other operating revenues		28,680	22,780	27,079
Downstream
Segment Reporting Information [Line Items]
Sales and other operating revenues		114,535	94,743	111,629
Downstream | United States
Segment Reporting Information [Line Items]
Sales and other operating revenues		53,140	44,717	52,872
Downstream | International
Segment Reporting Information [Line Items]
Sales and other operating revenues		61,395	50,026	58,757
Operating Segments
Segment Reporting Information [Line Items]
Sales and other operating revenues		157,505	129,030	153,011
Operating Segments | United States
Segment Reporting Information [Line Items]
Sales and other operating revenues		67,404	56,187	67,133
Operating Segments | International
Segment Reporting Information [Line Items]
Sales and other operating revenues		90,101	72,843	85,878
Operating Segments | Upstream | United States
Segment Reporting Information [Line Items]
Sales and other operating revenues		3,901	3,148	4,117
Operating Segments | Upstream | International
Segment Reporting Information [Line Items]
Sales and other operating revenues		17,209	13,262	15,587
Operating Segments | Downstream | United States
Segment Reporting Information [Line Items]
Sales and other operating revenues		48,728	40,366	48,420
Operating Segments | Downstream | International
Segment Reporting Information [Line Items]
Sales and other operating revenues		57,438	46,388	54,296
Intersegment
Segment Reporting Information [Line Items]
Sales and other operating revenues		(22,831)	(18,815)	(23,086)
Intersegment | United States
Segment Reporting Information [Line Items]
Sales and other operating revenues		814	960	1,372
Intersegment | International
Segment Reporting Information [Line Items]
Sales and other operating revenues		25	36	37
Intersegment | Upstream | United States
Segment Reporting Information [Line Items]
Sales and other operating revenues		9,341	7,217	8,631
Intersegment | Upstream | International
Segment Reporting Information [Line Items]
Sales and other operating revenues		11,471	9,518	11,492
Intersegment | Downstream | United States
Segment Reporting Information [Line Items]
Sales and other operating revenues		14	16	26
Intersegment | Downstream | International
Segment Reporting Information [Line Items]
Sales and other operating revenues		1,166	1,068	1,528
Segment Reconciling Items | Downstream | United States
Segment Reporting Information [Line Items]
Sales and other operating revenues		4,398	4,335	4,426
Segment Reconciling Items | Downstream | International
Segment Reporting Information [Line Items]
Sales and other operating revenues		2,791	2,570	2,933
All Other | United States
Segment Reporting Information [Line Items]
Sales and other operating revenues		208	145	141
All Other | International
Segment Reporting Information [Line Items]
Sales and other operating revenues		1	1	5
Total All Other
Segment Reporting Information [Line Items]
Sales and other operating revenues		$ 1,048	$ 1,142	$ 1,555
[1] Includes excise, value-added and similar taxes. $7,189; $6,905; $7,359.

X

- Definition

Aggregate revenue during the period related to oil and gas business activities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 23
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62136-109447

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 932
-SubTopic 235
-Section 50
-Paragraph 24
-URI http://asc.fasb.org/extlink&oid=68064819&loc=d3e62246-109447

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