Operating Segments and Geographic Data (Details 1) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Segment Assets
Segment Assets	$ 261,478	$ 264,540
Goodwill	4,581	4,588
United States [Member]
Segment Assets
Segment Assets	70,984	72,515
International [Member]
Segment Assets
Segment Assets	185,913	187,437
Operating Segments [Member]
Segment Assets
Segment Assets	248,532	249,387
Operating Segments [Member] | Upstream [Member]
Segment Assets
Segment Assets	210,715	213,001
Goodwill	4,581	4,588
Operating Segments [Member] | Upstream [Member] | United States [Member]
Segment Assets
Segment Assets	43,992	46,383
Operating Segments [Member] | Upstream [Member] | International [Member]
Segment Assets
Segment Assets	162,142	162,030
Operating Segments [Member] | Downstream [Member]
Segment Assets
Segment Assets	37,817	36,386
Operating Segments [Member] | Downstream [Member] | United States [Member]
Segment Assets
Segment Assets	21,949	21,404
Operating Segments [Member] | Downstream [Member] | International [Member]
Segment Assets
Segment Assets	15,868	14,982
Corporate, Non-Segment [Member]
Segment Assets
Segment Assets	12,946	15,153
Corporate, Non-Segment [Member] | United States [Member]
Segment Assets
Segment Assets	5,043	4,728
Corporate, Non-Segment [Member] | International [Member]
Segment Assets
Segment Assets	$ 7,903	$ 10,425