Operating Segments and Geographic Data (Details 1) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Segment Assets
Segment Assets	$ 257,929	$ 253,806
Goodwill	4,518	4,531
United States
Segment Assets
Segment Assets	72,204	68,910
International
Segment Assets
Segment Assets	181,207	180,365
Operating Segments
Segment Assets
Segment Assets	247,096	245,549
Operating Segments | Upstream
Segment Assets
Segment Assets	204,220	204,913
Goodwill	4,518	4,531
Operating Segments | Upstream | United States
Segment Assets
Segment Assets	42,266	40,770
Operating Segments | Upstream | International
Segment Assets
Segment Assets	157,436	159,612
Operating Segments | Downstream
Segment Assets
Segment Assets	42,876	40,636
Operating Segments | Downstream | United States
Segment Assets
Segment Assets	24,659	23,202
Operating Segments | Downstream | International
Segment Assets
Segment Assets	18,217	17,434
All Other
Segment Assets
Segment Assets	10,833	8,257
All Other | United States
Segment Assets
Segment Assets	5,279	4,938
All Other | International
Segment Assets
Segment Assets	$ 5,554	$ 3,319