Oil and Natural Gas Property Transactions - Narrative (Details) shares in Millions, $ in Millions		2 Months Ended	3 Months Ended
	Feb. 01, 2019 USD ($) shares	Mar. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($) a well
Business Acquisition [Line Items]
Revenues			$ 2,196	$ 2,524	[1]
Proceeds from divestitures of proved and unproved properties			26	319	[2]
Mid-Continent
Business Acquisition [Line Items]
Proceeds from divestitures of proved and unproved properties				$ 420
Productive gas wells, number of wells, net | well				2,150
Number of net acres | a				171,000
Other properties
Business Acquisition [Line Items]
Proceeds from divestitures of proved and unproved properties				$ 18
Wildhorse Resource Development Corporation
Business Acquisition [Line Items]
Common stock issued in the merger (in shares) | shares	717.4
Cash	$ 381
Revenues		$ 75
Operating expenses		164
Other expenses		$ 12
Other property sales
Business Acquisition [Line Items]
Proceeds from divestitures of proved and unproved properties			$ 26

[1] Financial information for 2018 has been recast to reflect the retrospective application of the successful efforts method of accounting. See Note 1.

[2] Financial information for 2018 has been recast to reflect the retrospective application of the successful efforts method of accounting. See Note 1.