Operating Segments and Geographic Data (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Total Income Tax Expense (Benefit)	$ (1,729)	$ 132	$ 11,892
Operating Segments [Member] | Upstream [Member]
Segment Reporting Information [Line Items]
Total Income Tax Expense (Benefit)	(1,006)	(827)	11,260
Operating Segments [Member] | Upstream [Member] | United States [Member]
Segment Reporting Information [Line Items]
Total Income Tax Expense (Benefit)	(1,172)	(2,041)	2,043
Operating Segments [Member] | Upstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Total Income Tax Expense (Benefit)	166	1,214	9,217
Operating Segments [Member] | Downstream [Member]
Segment Reporting Information [Line Items]
Total Income Tax Expense (Benefit)	987	2,633	1,769
Operating Segments [Member] | Downstream [Member] | United States [Member]
Segment Reporting Information [Line Items]
Total Income Tax Expense (Benefit)	503	1,320	1,302
Operating Segments [Member] | Downstream [Member] | International [Member]
Segment Reporting Information [Line Items]
Total Income Tax Expense (Benefit)	484	1,313	467
All Other [Member]
Segment Reporting Information [Line Items]
Total Income Tax Expense (Benefit)	$ (1,710)	$ (1,674)	$ (1,137)