Sales and Other Operating Revenue - Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Revenue from contracts with customers	$ 2,749	$ 7,953	$ 8,907	$ 17,103
Revenue, Performance Obligation, Description of Payment Terms			The payments are not directly related to our performance under the contract and are recorded as deferred revenue to be recognized as revenue when the customer can utilize and benefit from their right to use the license.
Customers within the scope of ASC Topic 606 [Member]
Revenue from contracts with customers	1,919	6,633	$ 6,830	13,692
Physical gas contracts [Member]
Revenue from contracts with customers	856	1,371	2,152	3,452
Crude oil product line [Member]
Revenue from contracts with customers	26	165	118	353
Natural Gas Product Line [Member]
Revenue from contracts with customers	763	1,095	1,853	2,863
Other Products [Member]
Revenue from contracts with customers	67	111	181	236
Financial Derivative Contracts [Member]
Revenue from contracts with customers	(26)	(51)	(75)	(41)
Lower 48 Segment \| Physical gas contracts [Member]
Revenue from contracts with customers	698	1,111	1,674	2,724
Canada Segment [Member] \| Physical gas contracts [Member]
Revenue from contracts with customers	121	100	300	341
Europe and North Africa Segment [Member] \| Physical gas contracts [Member]
Revenue from contracts with customers	$ 37	$ 160	$ 178	$ 387

Revenue, Performance Obligation, Description of Payment Terms

The payments are not directly related to our performance under the contract and are recorded as deferred revenue to be recognized as revenue when the customer can utilize and benefit from their right to use the license.