Operating Segments and Geographic Data (Details 1) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Total Assets	$ 260,078	$ 264,540
Goodwill	4,581	4,588
United States [Member]
Segment Reporting Information [Line Items]
Total Assets	69,712	72,515
International [Member]
Segment Reporting Information [Line Items]
Total Assets	185,785	187,437
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total Assets	249,325	249,387
Operating Segments [Member] | Upstream [Member]
Segment Reporting Information [Line Items]
Total Assets	211,245	213,001
Goodwill	4,581	4,588
Operating Segments [Member] | Upstream [Member] | United States [Member]
Segment Reporting Information [Line Items]
Total Assets	42,596	46,383
Operating Segments [Member] | Upstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Total Assets	164,068	162,030
Operating Segments [Member] | Downstream [Member]
Segment Reporting Information [Line Items]
Total Assets	38,080	36,386
Operating Segments [Member] | Downstream [Member] | United States [Member]
Segment Reporting Information [Line Items]
Total Assets	22,264	21,404
Operating Segments [Member] | Downstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Total Assets	15,816	14,982
All Other [Member]
Segment Reporting Information [Line Items]
Total Assets	10,753	15,153
All Other [Member] | United States [Member]
Segment Reporting Information [Line Items]
Total Assets	4,852	4,728
All Other [Member] | International [Member]
Segment Reporting Information [Line Items]
Total Assets	$ 5,901	$ 10,425