Operating Segments and Geographic Data (Details 2) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Sales and other operating revenues	[1]	$ 110,215	$ 129,925	$ 200,494
Upstream [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		33,145	39,827	69,825
Upstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		10,365	12,748	22,910
Upstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		22,780	27,079	46,915
Downstream [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		94,743	111,629	177,846
Downstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		44,717	52,872	78,606
Downstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		50,026	58,757	99,240
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		1,142	1,555	1,758
Corporate and Other [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		1,105	1,513	1,727
Corporate and Other [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		37	42	31
Operating Segments [Member] | Upstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		3,148	4,117	7,455
Operating Segments [Member] | Upstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		13,262	15,587	23,808
Operating Segments [Member] | Downstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		40,366	48,420	73,942
Operating Segments [Member] | Downstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		46,388	54,296	86,848
Operating Segments [Member] | Corporate and Other [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		145	141	252
Operating Segments [Member] | Corporate and Other [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		1	5	3
Intersegment Eliminations [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		(18,815)	(23,086)	(48,935)
Intersegment Eliminations [Member] | Upstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		7,217	8,631	15,455
Intersegment Eliminations [Member] | Upstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		9,518	11,492	23,107
Intersegment Eliminations [Member] | Downstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		16	26	31
Intersegment Eliminations [Member] | Downstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		1,068	1,528	8,839
Intersegment Eliminations [Member] | Corporate and Other [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		960	1,372	1,475
Intersegment Eliminations [Member] | Corporate and Other [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		36	37	28
Excise and Similar Taxes [Member] | Downstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		4,335	4,426	4,633
Excise and Similar Taxes [Member] | Downstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		2,570	2,933	3,553
All Other [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		129,030	153,011	249,429
All Other [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		56,187	67,133	103,243
All Other [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		$ 72,843	$ 85,878	$ 146,186

[1] Includes excise, value-added and similar taxes. $6,905; $7,359; $8,186.