Operating Segments and Geographic Data (Details 1) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Segment Assets
Segment Assets	$ 259,111	$ 260,078
Goodwill	4,543	4,581
United States [Member]
Segment Assets
Segment Assets	69,660	69,712
International [Member]
Segment Assets
Segment Assets	184,908	185,785
Operating Segments [Member]
Segment Assets
Segment Assets	248,503	249,325
Operating Segments [Member] | Upstream [Member]
Segment Assets
Segment Assets	209,790	211,245
Goodwill	4,543	4,581
Operating Segments [Member] | Upstream [Member] | United States [Member]
Segment Assets
Segment Assets	42,096	42,596
Operating Segments [Member] | Upstream [Member] | International [Member]
Segment Assets
Segment Assets	163,151	164,068
Operating Segments [Member] | Downstream [Member]
Segment Assets
Segment Assets	38,713	38,080
Operating Segments [Member] | Downstream [Member] | United States [Member]
Segment Assets
Segment Assets	22,590	22,264
Operating Segments [Member] | Downstream [Member] | International [Member]
Segment Assets
Segment Assets	16,123	15,816
All Other [Member]
Segment Assets
Segment Assets	10,608	10,753
All Other [Member] | United States [Member]
Segment Assets
Segment Assets	4,974	4,852
All Other [Member] | International [Member]
Segment Assets
Segment Assets	$ 5,634	$ 5,901