Operating Segments and Geographic Data (Details 2) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Sales and Other Operating Revenues
Sales and Other Operating Revenues	[1]	$ 29,159	$ 32,767	$ 80,073	$ 101,911
Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		34,437	38,452	93,668	120,120
United States [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		15,085	17,415	41,052	52,601
United States [Member] | Intersegment Eliminations [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(2,223)	(2,539)	(5,856)	(7,914)
International [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		19,352	21,037	52,616	67,519
International [Member] | Intersegment Eliminations [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(3,055)	(3,146)	(7,739)	(10,295)
Upstream [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		4,053	4,808	11,642	15,376
Upstream [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		8,774	9,747	23,711	31,252
Upstream [Member] | United States [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		2,847	3,207	7,386	10,089
Upstream [Member] | United States [Member] | Intersegment Eliminations [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(1,979)	(2,165)	(5,120)	(6,829)
Upstream [Member] | International [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		5,927	6,540	16,325	21,163
Upstream [Member] | International [Member] | Intersegment Eliminations [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(2,742)	(2,774)	(6,949)	(9,047)
Downstream [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		25,066	27,913	68,329	86,420
Downstream [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		25,373	28,279	69,103	87,662
Downstream [Member] | United States [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		11,958	13,795	32,841	41,336
Downstream [Member] | United States [Member] | Intersegment Eliminations [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(4)	(6)	(12)	(20)
Downstream [Member] | International [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		13,415	14,484	36,262	46,326
Downstream [Member] | International [Member] | Intersegment Eliminations [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(303)	(360)	(762)	(1,222)
Corporate and Other [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		40	46	102	115
Corporate and Other [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		290	426	854	1,206
Corporate and Other [Member] | United States [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		280	413	825	1,176
Corporate and Other [Member] | United States [Member] | Intersegment Eliminations [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(240)	(368)	(724)	(1,065)
Corporate and Other [Member] | International [Member] | Operating Segments [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		10	13	29	30
Corporate and Other [Member] | International [Member] | Intersegment Eliminations [Member]
Sales and Other Operating Revenues
Sales and Other Operating Revenues		$ (10)	$ (12)	$ (28)	$ (26)

[1] Includes excise, value-added and similar taxes: 1,772; 1,800; 5,208; 5,642