Operating Segments and Geographic Data (Details 2) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017	Mar. 31, 2016
Sales and Other Operating Revenues
Sales and Other Operating Revenues	[1]	$ 31,524	$ 23,070
Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		37,006	26,825
United States [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		15,907	11,488
United States [Member] | Intersegment Eliminations [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(2,427)	(1,555)
International [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		21,099	15,337
International [Member] | Intersegment Eliminations [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(3,055)	(2,200)
Upstream [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		4,860	3,833
Upstream [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		9,821	7,093
Upstream [Member] | United States [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		3,240	2,072
Upstream [Member] | United States [Member] | Intersegment Eliminations [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(2,241)	(1,331)
Upstream [Member] | International [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		6,581	5,021
Upstream [Member] | International [Member] | Intersegment Eliminations [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(2,720)	(1,929)
Downstream [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		26,612	19,208
Downstream [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		26,945	19,475
Downstream [Member] | United States [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		12,432	9,167
Downstream [Member] | United States [Member] | Intersegment Eliminations [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(3)	(4)
Downstream [Member] | International [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		14,513	10,308
Downstream [Member] | International [Member] | Intersegment Eliminations [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(330)	(263)
Corporate and Other [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		52	29
Corporate and Other [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		240	257
Corporate and Other [Member] | United States [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		235	249
Corporate and Other [Member] | United States [Member] | Intersegment Eliminations [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(183)	(220)
Corporate and Other [Member] | International [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		5	8
Corporate and Other [Member] | International [Member] | Intersegment Eliminations [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		$ (5)	$ (8)

[1] Includes excise, value-added and similar taxes: $1,677, $1,652