Operating Segments and Geographic Data (Details 2) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Sales and Other Operating Revenues
Sales and Other Operating Revenues	[1]	$ 33,892	$ 29,159	$ 98,293	$ 80,073
Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		39,452	34,437	114,754	93,668
All Other
Sales and Other Operating Revenues
Sales and Other Operating Revenues		266	290	792	854
Total All Other
Sales and Other Operating Revenues
Sales and Other Operating Revenues		53	40	153	102
United States | Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		16,957	15,085	49,599	41,052
United States | Intersegment Eliminations
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(207)	(240)	(621)	(724)
United States | All Other
Sales and Other Operating Revenues
Sales and Other Operating Revenues		260	280	773	825
United States | Intersegment Eliminations
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(2,510)	(2,223)	(7,369)	(5,856)
International | Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		22,495	19,352	65,155	52,616
International | Intersegment Eliminations
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(6)	(10)	(18)	(28)
International | All Other
Sales and Other Operating Revenues
Sales and Other Operating Revenues		6	10	19	29
International | Intersegment Eliminations
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(3,050)	(3,055)	(9,092)	(7,739)
Upstream
Sales and Other Operating Revenues
Sales and Other Operating Revenues		5,310	4,053	15,251	11,642
Upstream | Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		10,436	8,774	30,244	23,711
Upstream | United States | Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		3,245	2,847	9,620	7,386
Upstream | United States | Intersegment Eliminations
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(2,298)	(1,979)	(6,737)	(5,120)
Upstream | International | Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		7,191	5,927	20,624	16,325
Upstream | International | Intersegment Eliminations
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(2,828)	(2,742)	(8,256)	(6,949)
Downstream
Sales and Other Operating Revenues
Sales and Other Operating Revenues		28,529	25,066	82,889	68,329
Downstream | Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		28,750	25,373	83,718	69,103
Downstream | United States | Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		13,452	11,958	39,206	32,841
Downstream | United States | Intersegment Eliminations
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(5)	(4)	(11)	(12)
Downstream | International | Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		15,298	13,415	44,512	36,262
Downstream | International | Intersegment Eliminations
Sales and Other Operating Revenues
Sales and Other Operating Revenues		$ (216)	$ (303)	$ (818)	$ (762)

[1] Includes excise, value-added and similar taxes: $1,867, $1,772, $5,315, $5,208