Operating Segments and Geographic Data (Details 2) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Sales and Other Operating Revenues
Sales and Other Operating Revenues	[1]	$ 32,877	$ 27,844	$ 64,401	$ 50,914
Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		38,296	32,406	75,302	59,231
United States | Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		16,735	14,479	32,642	25,967
United States | Intersegment Eliminations
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(2,432)	(2,078)	(4,859)	(3,633)
International | Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		21,561	17,927	42,660	33,264
International | Intersegment Eliminations
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(2,987)	(2,484)	(6,042)	(4,684)
Upstream
Sales and Other Operating Revenues
Sales and Other Operating Revenues		5,081	3,756	9,941	7,589
Upstream | Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		9,987	7,844	19,808	14,937
Upstream | United States | Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		3,135	2,467	6,375	4,539
Upstream | United States | Intersegment Eliminations
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(2,198)	(1,810)	(4,439)	(3,141)
Upstream | International | Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		6,852	5,377	13,433	10,398
Upstream | International | Intersegment Eliminations
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(2,708)	(2,278)	(5,428)	(4,207)
Downstream
Sales and Other Operating Revenues
Sales and Other Operating Revenues		27,748	24,055	54,360	43,263
Downstream | Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		28,023	24,255	54,968	43,730
Downstream | United States | Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		13,322	11,716	25,754	20,883
Downstream | United States | Intersegment Eliminations
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(3)	(4)	(6)	(8)
Downstream | International | Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		14,701	12,539	29,214	22,847
Downstream | International | Intersegment Eliminations
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(272)	(196)	(602)	(459)
All Other
Sales and Other Operating Revenues
Sales and Other Operating Revenues		48	33	100	62
All Other | Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		286	307	526	564
All Other | United States | Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		278	296	513	545
All Other | United States | Intersegment Eliminations
Sales and Other Operating Revenues
Sales and Other Operating Revenues		(231)	(264)	(414)	(484)
All Other | International | Operating Segments
Sales and Other Operating Revenues
Sales and Other Operating Revenues		8	11	13	19
All Other | International | Intersegment Eliminations
Sales and Other Operating Revenues
Sales and Other Operating Revenues		$ (7)	$ (10)	$ (12)	$ (18)

[1] Includes excise, value-added and similar taxes: $1,771, $1,784, $3,448, $3,436