Property, Plant and Equipment (Details) - USD ($)	Sep. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 16,029,000,000	$ 17,000,000,000
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	15,533,000,000	16,427,000,000
Operating Segments | International E&P
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	424,000,000	493,000,000
Not Allocated to Segments
Property, Plant and Equipment [Line Items]
Property, plant and equipment, net	$ 72,000,000	$ 80,000,000