Property, Plant and Equipment (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 16,931	$ 17,665
Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year After Completion of Drilling	32	32
United States Exploration and Production [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	15,922	15,867
International Exploration and Production [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	926	1,710
Corporate [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 83	$ 88