Property, Plant and Equipment, net of Accumulated Depreciation, Depletion and Amortization (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 16,903	$ 17,000
Exploratory well costs capitalized greater than one year after completion of drilling	0	0
Operating Segments | United States E&P
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	16,352	16,427
Operating Segments | International E&P
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	471	493
Not Allocated to Segments
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 80	$ 80