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Income Taxes - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Mar. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Business Acquisition [Line Items]            
Effective income tax rate 0.10%          
Deferred income tax expense   $ 10     $ (10) $ (314)
Deferred tax liabilities   $ 10        
Income tax benefit $ 0   $ 1   $ 13 $ 315
Ownership change, cumulative shift         40.00%  
Wildhorse Resource Development Corporation            
Business Acquisition [Line Items]            
Deferred tax liabilities       $ 314    
Income tax benefit       314 $ 13  
Deferred tax liability, plant, property and equipment and prepaid compensation       401    
Deferred tax asset, operating loss carryforward, limitations $ 61       $ 61  
Wildhorse Resource Development Corporation | Federal            
Business Acquisition [Line Items]            
Deferred tax asset, operating loss carryforward       $ 87