Operating Segments and Geographic Data (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012
Sales and Other Operating Revenues
Sales and other operating revenues	$ 54,296	[1]	$ 58,896	[1]
Upstream [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	6,628		6,893
Upstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	6,267		6,201
Upstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	12,911		14,515
Upstream [Member] | Subtotal [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	19,178		20,716
Upstream [Member] | Intersegment Elimination - United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(4,194)		(4,597)
Upstream [Member] | Intersegment Elimination - International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(8,356)		(9,226)
Downstream [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	47,581		51,908
Downstream [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	20,430		22,684
Downstream [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	27,178		29,250
Downstream [Member] | Subtotal [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	47,608		51,934
Downstream [Member] | Intersegment Elimination - United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(11)		(15)
Downstream [Member] | Intersegment Elimination - International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(16)		(11)
All Other Segments [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	87		95
All Other Segments [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	378		326
All Other Segments [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	6		12
All Other Segments [Member] | Subtotal [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	384		338
All Other Segments [Member] | Intersegment Elimination - United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(292)		(231)
All Other Segments [Member] | Intersegment Elimination - International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(5)		(12)
Sales and Other Operating Revenue [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	54,296		58,896
Sales and Other Operating Revenue [Member] | United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	27,075		29,211
Sales and Other Operating Revenue [Member] | International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	40,095		43,777
Sales and Other Operating Revenue [Member] | Subtotal [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	67,170		72,988
Sales and Other Operating Revenue [Member] | Intersegment Elimination - United States [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	(4,497)		(4,843)
Sales and Other Operating Revenue [Member] | Intersegment Elimination - International [Member]
Sales and Other Operating Revenues
Sales and other operating revenues	$ (8,377)		$ (9,249)

[1] * Includes excise, value-added and similar taxes:2,033 1,787