Income Taxes - Narrative (Details) - USD ($)	3 Months Ended				9 Months Ended
	Sep. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	[1]	Sep. 30, 2019	Sep. 30, 2018	[1]	Feb. 01, 2019
Business Acquisition [Line Items]
Effective income tax rate	0.00%
Income tax benefit	$ 1,000,000		$ (1,000,000)		$ 315,000,000	$ 8,000,000
Ownership change, cumulative shift					40.00%
Wildhorse Resource Development Corporation
Business Acquisition [Line Items]
Deferred tax liabilities		$ 314,000,000						$ 314,000,000
Income tax benefit	1,000,000	314,000,000			$ 315,000,000
Deferred tax liability, plant, property and equipment and prepaid compensation		401,000,000
Deferred tax assets, operating loss carryforward, limitations	$ 61,000,000				61,000,000
Wildhorse Resource Development Corporation | Federal
Business Acquisition [Line Items]
Deferred tax asset, operating loss carryforward		$ 87,000,000
Wildhorse Resource Development Corporation | State
Business Acquisition [Line Items]
Income tax benefit					$ 314,000,000

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