Operating Segments and Geographic Data (Details 2) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Sales and Other Operating Revenues
Sales and other operating revenues	[1]	$ 36,829	$ 55,583	$ 69,144	$ 106,561
Upstream [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		5,107	8,562	10,568	17,494
Downstream [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		31,689	46,945	58,507	88,917
Operating Segments [Member] | Upstream [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		10,941	19,419	21,505	38,045
Operating Segments [Member] | Upstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		3,533	5,965	6,882	12,710
Operating Segments [Member] | Upstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		7,408	13,454	14,623	25,335
Operating Segments [Member] | Downstream [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		32,085	49,801	59,383	93,823
Operating Segments [Member] | Downstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		15,107	21,202	27,541	41,420
Operating Segments [Member] | Downstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		16,978	28,599	31,842	52,403
Intersegment Eliminations [Member] | Upstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		(2,553)	(4,260)	(4,664)	(8,192)
Intersegment Eliminations [Member] | Upstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		(3,281)	(6,597)	(6,273)	(12,359)
Intersegment Eliminations [Member] | Downstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		(8)	(7)	(14)	(12)
Intersegment Eliminations [Member] | Downstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		(388)	(2,849)	(862)	(4,894)
Corporate, Non-Segment [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		448	494	780	888
Corporate, Non-Segment [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		438	486	763	875
Corporate, Non-Segment [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		10	8	17	13
Intersegment Eliminations, Corporate, Non-Segment [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		(407)	(411)	(697)	(726)
Intersegment Eliminations, Corporate, Non-Segment [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		(8)	(7)	(14)	(12)
Corporate, Non-Segment, Excluding Intersegment Eliminations [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		33	76	69	150
Operating Segments and Coporate, Non-Segment [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		43,474	69,714	81,668	132,756
Operating Segments and Coporate, Non-Segment [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		19,078	27,653	35,186	55,005
Operating Segments and Coporate, Non-Segment [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		24,396	42,061	46,482	77,751
Intersegment Eliminations, Operating Segments and Corporate, Non-Segment [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		(2,968)	(4,678)	(5,375)	(8,930)
Intersegment Eliminations, Operating Segments and Corporate, Non-Segment [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		$ (3,677)	$ (9,453)	$ (7,149)	$ (17,265)

[1] * Includes excise, value-added and similar taxes:$1,965 $2,120 $3,842 $4,066