Operating Segments and Geographic Data (Details 1) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Segment Assets
Segment Assets	$ 259,863	$ 264,540
Goodwill	4,581	4,588
United States [Member]
Segment Assets
Segment Assets	69,455	72,515
International [Member]
Segment Assets
Segment Assets	185,827	187,437
Operating Segments [Member]
Segment Assets
Segment Assets	248,479	249,387
Operating Segments [Member] | Upstream [Member]
Segment Assets
Segment Assets	211,176	213,001
Goodwill	4,581	4,588
Operating Segments [Member] | Upstream [Member] | United States [Member]
Segment Assets
Segment Assets	42,914	46,383
Operating Segments [Member] | Upstream [Member] | International [Member]
Segment Assets
Segment Assets	163,681	162,030
Operating Segments [Member] | Downstream [Member]
Segment Assets
Segment Assets	37,303	36,386
Operating Segments [Member] | Downstream [Member] | United States [Member]
Segment Assets
Segment Assets	21,416	21,404
Operating Segments [Member] | Downstream [Member] | International [Member]
Segment Assets
Segment Assets	15,887	14,982
All Other [Member]
Segment Assets
Segment Assets	11,384	15,153
All Other [Member] | United States [Member]
Segment Assets
Segment Assets	5,125	4,728
All Other [Member] | International [Member]
Segment Assets
Segment Assets	$ 6,259	$ 10,425