Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Segment Reporting Information [Line Items]
Less accumulated depreciation, depletion and amortization	$ (22,336)	$ (21,895)
Property, plant and equipment, net	28,426	28,145
Libya 1 [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	770
North America Exploration and Production [Member]
Segment Reporting Information [Line Items]
Total property, plant and equipment	27,309	26,755
International Exploration and Production [Member]
Segment Reporting Information [Line Items]
Total property, plant and equipment	12,519	12,428
Oil Sands Mining Segment [Member]
Segment Reporting Information [Line Items]
Total property, plant and equipment	10,514	10,436
Corporate [Member]
Segment Reporting Information [Line Items]
Total property, plant and equipment	420	421
Total All Segments [Member]
Segment Reporting Information [Line Items]
Total property, plant and equipment	$ 50,762	$ 50,040