Property, Plant and Equipment (Details) Boe in Millions, $ in Millions	Dec. 31, 2016 USD ($) Boe	Dec. 31, 2015 USD ($)
Segment Reporting Information [Line Items]
Less accumulated depreciation, depletion and amortization	$ (22,214)	$ (23,260)
Property, plant and equipment, net	25,718	27,061
North America Exploration and Production [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	14,158	15,226
International Exploration and Production [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	2,470	2,533
Oil Sands Mining Segment [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	8,991	9,197
Corporate [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	99	$ 105
Libya [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 768
Proved Developed and Undeveloped Reserves, Net (BOE) | Boe	206