Operating Segments and Geographic Data (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Sales and Other Operating Revenues
Sales and other operating revenues	$ 55,583	[1],[2]	$ 55,307	[1],[2]	$ 106,561	[1],[2]	$ 109,603	[1],[2]
Operating Segments [Member] | Upstream [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	19,419	[1]	18,159	[1]	38,045	[1]	37,337	[1]
Operating Segments [Member] | Upstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	5,965	[1]	6,413	[1]	12,710	[1]	12,680	[1]
Operating Segments [Member] | Upstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	13,454	[1]	11,746	[1]	25,335	[1]	24,657	[1]
Operating Segments [Member] | Downstream [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	49,801	[1]	48,777	[1]	93,823	[1]	96,385	[1]
Operating Segments [Member] | Downstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	21,202	[1]	21,555	[1]	41,420	[1]	41,985	[1]
Operating Segments [Member] | Downstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	28,599	[1]	27,222	[1]	52,403	[1]	54,400	[1]
Intersegment Eliminations [Member] | Upstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(4,260)	[1]	(4,217)	[1]	(8,192)	[1]	(8,411)	[1]
Intersegment Eliminations [Member] | Upstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(6,597)	[1]	(7,449)	[1]	(12,359)	[1]	(15,805)	[1]
Intersegment Eliminations [Member] | Downstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(7)	[1]	(11)	[1]	(12)	[1]	(22)	[1]
Intersegment Eliminations [Member] | Downstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(2,849)	[1]	(26)	[1]	(4,894)	[1]	(42)	[1]
Operating Segments, Excluding Intersegment Eliminations [Member] | Upstream [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	8,562	[1]	6,493	[1]	17,494	[1]	13,121	[1]
Operating Segments, Excluding Intersegment Eliminations [Member] | Downstream [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	46,945	[1]	48,740	[1]	88,917	[1]	96,321	[1]
Corporate, Non-Segment [Member] | All Other [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	494	[1]	458	[1]	888	[1]	842	[1]
Corporate, Non-Segment [Member] | All Other [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	486	[1]	449	[1]	875	[1]	827	[1]
Corporate, Non-Segment [Member] | All Other [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	8	[1]	9	[1]	13	[1]	15	[1]
Intersegment Eliminations, Corporate, Non-Segment [Member] | All Other [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(411)	[1]	(375)	[1]	(726)	[1]	(667)	[1]
Intersegment Eliminations, Corporate, Non-Segment [Member] | All Other [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(7)	[1]	(9)	[1]	(12)	[1]	(14)	[1]
Corporate, Non-Segment, Excluding Intersegment Eliminations [Member] | All Other [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	76	[1]	74	[1]	150	[1]	161	[1]
Operating Segments and Coporate, Non-Segment [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	69,714	[1]	67,394	[1]	132,756	[1]	134,564	[1]
Operating Segments and Coporate, Non-Segment [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	27,653	[1]	28,417	[1]	55,005	[1]	55,492	[1]
Operating Segments and Coporate, Non-Segment [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	42,061	[1]	38,977	[1]	77,751	[1]	79,072	[1]
Intersegment Eliminations, Operating Segments and Corporate, Non-Segment [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(4,678)	[1]	(4,603)	[1]	(8,930)	[1]	(9,100)	[1]
Intersegment Eliminations, Operating Segments and Corporate, Non-Segment [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	$ (9,453)	[1]	$ (7,484)	[1]	$ (17,265)	[1]	$ (15,861)	[1]

[1] 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.

[2] * Includes excise, value-added and similar taxes:$2,120 $2,108 $4,066 $4,141