Operating Segments and Geographic Data (Details 2) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Sales and Other Operating Revenues
Sales and Other Operating Revenues	[1]	$ 27,844	$ 36,829	$ 50,914	$ 69,144
Upstream [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		3,756	5,107	7,589	10,568
Downstream [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		24,055	31,689	43,263	58,507
Operating Segments [Member] | Upstream [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		7,844	10,941	14,937	21,505
Operating Segments [Member] | Upstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		2,467	3,533	4,539	6,882
Operating Segments [Member] | Upstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		5,377	7,408	10,398	14,623
Operating Segments [Member] | Downstream [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		24,255	32,085	43,730	59,383
Operating Segments [Member] | Downstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		11,716	15,107	20,883	27,541
Operating Segments [Member] | Downstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		12,539	16,978	22,847	31,842
Intersegment Eliminations [Member] | Upstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(1,810)	(2,553)	(3,141)	(4,664)
Intersegment Eliminations [Member] | Upstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(2,278)	(3,281)	(4,207)	(6,273)
Intersegment Eliminations [Member] | Downstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(4)	(8)	(8)	(14)
Intersegment Eliminations [Member] | Downstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(196)	(388)	(459)	(862)
Corporate, Non-Segment [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		307	448	564	780
Corporate, Non-Segment [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		296	438	545	763
Corporate, Non-Segment [Member] | International [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		11	10	19	17
Intersegment Eliminations, Corporate, Non-Segment [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(264)	(407)	(484)	(697)
Intersegment Eliminations, Corporate, Non-Segment [Member] | International [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(10)	(8)	(18)	(14)
Corporate, Non-Segment, Excluding Intersegment Eliminations [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		33	33	62	69
Operating Segments and Coporate, Non-Segment [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		32,406	43,474	59,231	81,668
Operating Segments and Coporate, Non-Segment [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		14,479	19,078	25,967	35,186
Operating Segments and Coporate, Non-Segment [Member] | International [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		17,927	24,396	33,264	46,482
Intersegment Eliminations, Operating Segments and Corporate, Non-Segment [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(2,078)	(2,968)	(3,633)	(5,375)
Intersegment Eliminations, Operating Segments and Corporate, Non-Segment [Member] | International [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		$ (2,484)	$ (3,677)	$ (4,684)	$ (7,149)

[1] Includes excise, value-added and similar taxes: 1,784; 1,965; 3,436; 3,842