Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Segment Reporting Information [Line Items]
Less accumulated depreciation, depletion and amortization	$ (21,171)	$ (19,266)
Property, plant and equipment, net	27,822	28,272
Libya 1 [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	743
North America Exploration and Production [Member]
Segment Reporting Information [Line Items]
Total property, plant and equipment	25,858	23,748
International Exploration and Production [Member]
Segment Reporting Information [Line Items]
Total property, plant and equipment	12,342	13,214
Oil Sands Mining Segment [Member]
Segment Reporting Information [Line Items]
Total property, plant and equipment	10,337	10,127
Corporate [Member]
Segment Reporting Information [Line Items]
Total property, plant and equipment	456	449
Total All Segments [Member]
Segment Reporting Information [Line Items]
Total property, plant and equipment	$ 48,993	$ 47,538