Operating Segments and Geographic Data (Details 1) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Segment Assets
Segment Assets	$ 256,606	$ 253,806
Goodwill	4,518	4,531
United States
Segment Assets
Segment Assets	71,620	68,910
International
Segment Assets
Segment Assets	180,468	180,365
Operating Segments
Segment Assets
Segment Assets	243,809	245,549
Operating Segments | Upstream
Segment Assets
Segment Assets	202,040	204,913
Goodwill	4,518	4,531
Operating Segments | Upstream | United States
Segment Assets
Segment Assets	42,126	40,770
Operating Segments | Upstream | International
Segment Assets
Segment Assets	155,396	159,612
Operating Segments | Downstream
Segment Assets
Segment Assets	41,769	40,636
Operating Segments | Downstream | United States
Segment Assets
Segment Assets	24,141	23,202
Operating Segments | Downstream | International
Segment Assets
Segment Assets	17,628	17,434
All Other
Segment Assets
Segment Assets	12,797	8,257
All Other | United States
Segment Assets
Segment Assets	5,353	4,938
All Other | International
Segment Assets
Segment Assets	$ 7,444	$ 3,319