Operating Segments and Geographic Data (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Sales and Other Operating Revenues
Sales and other operating revenues	$ 51,822	[1],[2]	$ 56,603	[1],[2]	$ 158,383	[1],[2]	$ 166,206	[1],[2]
Operating Segments [Member] | Upstream [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	17,760	[2]	19,395	[2]	55,805	[2]	56,732	[2]
Operating Segments [Member] | Upstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	5,676	[2]	6,396	[2]	18,386	[2]	19,076	[2]
Operating Segments [Member] | Upstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	12,084	[2]	12,999	[2]	37,419	[2]	37,656	[2]
Operating Segments [Member] | Downstream [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	46,694	[2]	50,440	[2]	140,517	[2]	146,825	[2]
Operating Segments [Member] | Downstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	20,623	[2]	22,425	[2]	62,043	[2]	64,410	[2]
Operating Segments [Member] | Downstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	26,071	[2]	28,015	[2]	78,474	[2]	82,415	[2]
Intersegment Eliminations [Member] | Upstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(4,127)	[2]	(4,405)	[2]	(12,319)	[2]	(12,816)	[2]
Intersegment Eliminations [Member] | Upstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(6,317)	[2]	(8,715)	[2]	(18,676)	[2]	(24,520)	[2]
Intersegment Eliminations [Member] | Downstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(6)	[2]	(10)	[2]	(18)	[2]	(32)	[2]
Intersegment Eliminations [Member] | Downstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(2,252)	[2]	(197)	[2]	(7,146)	[2]	(239)	[2]
Operating Segments, Excluding Intersegment Eliminations [Member] | Upstream [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	7,316	[2]	6,275	[2]	24,810	[2]	19,396	[2]
Operating Segments, Excluding Intersegment Eliminations [Member] | Downstream [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	44,436	[2]	50,233	[2]	133,353	[2]	146,554	[2]
Corporate, Non-Segment [Member] | All Other [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	485	[2]	503	[2]	1,373	[2]	1,345	[2]
Corporate, Non-Segment [Member] | All Other [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	474	[2]	494	[2]	1,349	[2]	1,321	[2]
Corporate, Non-Segment [Member] | All Other [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	11	[2]	9	[2]	24	[2]	24	[2]
Intersegment Eliminations, Corporate, Non-Segment [Member] | All Other [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(404)	[2]	(400)	[2]	(1,130)	[2]	(1,067)	[2]
Intersegment Eliminations, Corporate, Non-Segment [Member] | All Other [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(11)	[2]	(8)	[2]	(23)	[2]	(22)	[2]
Corporate, Non-Segment, Excluding Intersegment Eliminations [Member] | All Other [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	70	[2]	95	[2]	220	[2]	256	[2]
Operating Segments and Coporate, Non-Segment [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	64,939	[2]	70,338	[2]	197,695	[2]	204,902	[2]
Operating Segments and Coporate, Non-Segment [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	26,773	[2]	29,315	[2]	81,778	[2]	84,807	[2]
Operating Segments and Coporate, Non-Segment [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	38,166	[2]	41,023	[2]	115,917	[2]	120,095	[2]
Intersegment Eliminations, Operating Segments and Corporate, Non-Segment [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(4,537)	[2]	(4,815)	[2]	(13,467)	[2]	(13,915)	[2]
Intersegment Eliminations, Operating Segments and Corporate, Non-Segment [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	$ (8,580)	[2]	$ (8,920)	[2]	$ (25,845)	[2]	$ (24,781)	[2]

[1] * Includes excise, value-added and similar taxes:$2,116 $2,223 $6,182 $6,364

[2] Effective January 1, 2014, International Upstream prospectively includes selected amounts previously recognized in International Downstream, which are not material to the company’s results of operations or financial position.