Property, Plant and Equipment (Details) Boe in Millions, $ in Millions	Sep. 30, 2015 USD ($)	Dec. 31, 2014 USD ($) Boe
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 27,920	$ 29,040
LIBYAN ARAB JAMAHIRIYA
Segment Reporting Information [Line Items]
Property, plant and equipment, net	775
Proved Developed and Undeveloped Reserves, Net (BOE) | Boe		243
North America Exploration and Production [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	15,875	$ 16,717
International Exploration and Production [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	2,604	2,741
Oil Sands Mining Segment [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	9,334	9,455
Corporate [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 107	$ 127