Operating Segments and Geographic Data (Details 2) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Sales and Other Operating Revenues
Sales and other operating revenues	[1]	$ 32,767	$ 51,822	$ 101,911	$ 158,383
Upstream [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		4,808	7,316	15,376	24,810
Downstream [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		27,913	44,436	86,420	133,353
Operating Segments [Member] | Upstream [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		9,747	17,760	31,252	55,805
Operating Segments [Member] | Upstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		3,207	5,676	10,089	18,386
Operating Segments [Member] | Upstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		6,540	12,084	21,163	37,419
Operating Segments [Member] | Downstream [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		28,279	46,694	87,662	140,517
Operating Segments [Member] | Downstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		13,795	20,623	41,336	62,043
Operating Segments [Member] | Downstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		14,484	26,071	46,326	78,474
Intersegment Eliminations [Member] | Upstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		(2,165)	(4,127)	(6,829)	(12,319)
Intersegment Eliminations [Member] | Upstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		(2,774)	(6,317)	(9,047)	(18,676)
Intersegment Eliminations [Member] | Downstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		(6)	(6)	(20)	(18)
Intersegment Eliminations [Member] | Downstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		(360)	(2,252)	(1,222)	(7,146)
Corporate, Non-Segment [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		426	485	1,206	1,373
Corporate, Non-Segment [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		413	474	1,176	1,349
Corporate, Non-Segment [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		13	11	30	24
Intersegment Eliminations, Corporate, Non-Segment [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		(368)	(404)	(1,065)	(1,130)
Intersegment Eliminations, Corporate, Non-Segment [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		(12)	(11)	(26)	(23)
Corporate, Non-Segment, Excluding Intersegment Eliminations [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		46	70	115	220
Operating Segments and Coporate, Non-Segment [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		38,452	64,939	120,120	197,695
Operating Segments and Coporate, Non-Segment [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		17,415	26,773	52,601	81,778
Operating Segments and Coporate, Non-Segment [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		21,037	38,166	67,519	115,917
Intersegment Eliminations, Operating Segments and Corporate, Non-Segment [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		(2,539)	(4,537)	(7,914)	(13,467)
Intersegment Eliminations, Operating Segments and Corporate, Non-Segment [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues		$ (3,146)	$ (8,580)	$ (10,295)	$ (25,845)

[1] * Includes excise, value-added and similar taxes:$1,800 $2,116 $5,642 $6,182