Property, Plant and Equipment (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 17,000	$ 16,804
Not Allocated to Segments [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	80	83
International Exploration and Production [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	493	710
United States Exploration and Production [Member] | Operating Segments [Member]
Segment Reporting Information [Line Items]
Property, plant and equipment, net	$ 16,427	$ 16,011