Operating Segments and Geographic Data (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Total Income Tax Expense	$ 132	$ 11,892	$ 14,308
Operating Segments [Member] | Upstream [Member]
Segment Reporting Information [Line Items]
Total Income Tax Expense	(827)	11,260	14,803
Operating Segments [Member] | Upstream [Member] | United States [Member]
Segment Reporting Information [Line Items]
Total Income Tax Expense	(2,041)	2,043	2,333
Operating Segments [Member] | Upstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Total Income Tax Expense	1,214	9,217	12,470
Operating Segments [Member] | Downstream [Member]
Segment Reporting Information [Line Items]
Total Income Tax Expense	2,633	1,769	753
Operating Segments [Member] | Downstream [Member] | United States [Member]
Segment Reporting Information [Line Items]
Total Income Tax Expense	1,320	1,302	364
Operating Segments [Member] | Downstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Total Income Tax Expense	1,313	467	389
Corporate, Non-Segment [Member] | All Other [Member]
Segment Reporting Information [Line Items]
Total Income Tax Expense	$ (1,674)	$ (1,137)	$ (1,248)