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Divestitures (Narrative) (Details) $ in Billions			3 Months Ended			6 Months Ended
	Jun. 27, 2019 USD ($) MMBoe	Jun. 27, 2019 CAD ($) MMBoe	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($) MMBoe	Jun. 30, 2018 USD ($)	Jun. 30, 2019 USD ($)	Jun. 30, 2018 USD ($)
Business Acquisition [Line Items]
Gain recognized on sale of business, pre tax			$ 189,000,000			$ 189,000,000
Asset retirement obligations assumed by other party						40,000,000	$ 58,000,000
Gain recognized			1,000,000		$ (23,000,000)	45,000,000	$ (11,000,000)
Barnett Shale [Member]
Business Acquisition [Line Items]
Net assets			$ 1,400,000,000			$ 1,400,000,000
Permian Basin [Member] | Non Core Assets [Member]
Business Acquisition [Line Items]
Total estimated proved reserves | MMBoe				25
Divestitures of property and equipment				$ 300,000,000
Gain recognized				$ 44,000,000
Permian Basin [Member] | Non Core Assets [Member] | Maximum [Member]
Business Acquisition [Line Items]
Percentage of estimated U.S. total proved reserves associated with divestiture assets.				2.00%
Barnett Shale Johnson County [Member]
Business Acquisition [Line Items]
Asset retirement obligations assumed by other party					$ 34,000,000
Percentage of proved reserves associated with divestiture assets compared to total estimated proved reserves					10.00%
Divestitures of property and equipment					$ 553,000,000
Gain recognized					0
Settlement expenses relating to gas processing contracts					$ 40,000,000
Canadian​ Divestiture [Member]
Business Acquisition [Line Items]
Restructuring and asset impairment related charges	$ 273,000,000
Canadian Natural Resources Limited [Member] | Canadian Business Segment [Member]
Business Acquisition [Line Items]
Proceeds from sale of business, net of purchase price adjustments	$ 2,600,000,000	$ 3.4
Effective close date of divestiture	Jun. 27, 2019	Jun. 27, 2019
Gain recognized on sale of business, pre tax	$ 189,000,000
Gain recognized on sale of business, net of tax	460,000,000
Asset retirement obligations assumed by other party	$ 436,000,000
Total estimated proved reserves | MMBoe	400	400
Percentage of proved reserves associated with divestiture assets compared to total estimated proved reserves	21.00%	21.00%

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