Operating Segments and Geographic Data (Details 2) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Sales and other operating revenues	[1]	$ 129,925	$ 200,494	$ 220,156
Upstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		4,117	7,455	8,052
Upstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		15,587	23,808	17,607
Downstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		48,420	73,942	80,272
Downstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		54,296	86,848	105,373
All Other [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		141	252	358
All Other [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		5	3	3
Intersegment Eliminations [Member] | Upstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		8,631	15,455	16,865
Intersegment Eliminations [Member] | Upstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		11,492	23,107	33,034
Intersegment Eliminations [Member] | Downstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		26	31	39
Intersegment Eliminations [Member] | Downstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		1,528	8,839	859
Operating Segments [Member] | Upstream [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	[2]	39,827	69,825	75,558
Operating Segments [Member] | Upstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		12,748	22,910	24,917
Operating Segments [Member] | Upstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		27,079	46,915	50,641
Operating Segments [Member] | Downstream [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues	[2]	111,629	177,846	195,034
Operating Segments [Member] | Downstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		52,872	78,606	85,103
Operating Segments [Member] | Downstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		58,757	99,240	109,931
Other Segment Reconciling Item: Excise and Similar Taxes [Member] | Downstream [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		4,426	4,633	4,792
Other Segment Reconciling Item: Excise and Similar Taxes [Member] | Downstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		2,933	3,553	3,699
Intersegment Eliminations, Corporate, Non-Segment [Member] | All Other [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		1,372	1,475	1,524
Intersegment Eliminations, Corporate, Non-Segment [Member] | All Other [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		37	28	31
Corporate, Non-Segment [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		1,555	1,758	1,916
Corporate, Non-Segment [Member] | All Other [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		1,513	1,727	1,882
Corporate, Non-Segment [Member] | All Other [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		42	31	34
Operating Segments and Coporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		153,011	249,429	272,508
Operating Segments and Coporate, Non-Segment [Member] | Total United States [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		67,133	103,243	111,902
Operating Segments and Coporate, Non-Segment [Member] | International [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		85,878	146,186	160,606
Intersegment Eliminations, Operating Segments and Corporate, Non-Segment [Member]
Segment Reporting Information [Line Items]
Sales and other operating revenues		$ (23,086)	$ (48,935)	$ (52,352)

[1] Includes excise, value-added and similar taxes. $7,359; $8,186; $8,492.

[2] Effective January 1, 2014, International Upstream prospectively includes selected amounts previously recognized in International Downstream, which are not material to the segments.