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Investment in Nonconsolidated Entity (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 25, 2018
USD ($)
Sep. 30, 2018
USD ($)
mi
Apr. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
mi
Sep. 30, 2017
USD ($)
Dec. 31, 2020
USD ($)
mi
Dec. 31, 2018
USD ($)
Schedule of Equity Method Investments [Line Items]                
Percent interest to require approval         66.67%      
Payments to noncontrolling interests         $ 175,000 $ 0    
Variable Interest Entity, Not Primary Beneficiary | MVP Joint Venture                
Schedule of Equity Method Investments [Line Items]                
Issuance of performance guarantee   $ 91,000     91,000      
Maximum financial statement exposure   $ 1,391,000     $ 1,391,000      
Scenario, Forecast | Variable Interest Entity, Not Primary Beneficiary | MVP Joint Venture                
Schedule of Equity Method Investments [Line Items]                
Issuance of performance guarantee             $ 345,000  
EQM | MVP Joint Venture                
Schedule of Equity Method Investments [Line Items]                
Ownership percentage   45.50%     45.50%      
Mountain Valley Pipeline                
Schedule of Equity Method Investments [Line Items]                
Natural gas interstate pipeline (in miles) | mi   300     300      
Estimated project cost         $ 4,600,000      
Mountain Valley Pipeline | EQM | Scenario, Forecast                
Schedule of Equity Method Investments [Line Items]                
Payments to noncontrolling interests             2,200,000  
Amount in excess of ownership interest             $ 65,000  
Mountain Valley Pipeline | EQM | Scenario, Forecast | Minimum                
Schedule of Equity Method Investments [Line Items]                
Payments to noncontrolling interests               $ 800,000
Mountain Valley Pipeline | EQM | Scenario, Forecast | Maximum                
Schedule of Equity Method Investments [Line Items]                
Payments to noncontrolling interests               $ 1,000,000
Mountain Valley Pipeline | MVP Joint Venture                
Schedule of Equity Method Investments [Line Items]                
Capital call notice   $ 456,000            
Mountain Valley Pipeline | MVP Joint Venture | Subsequent Event                
Schedule of Equity Method Investments [Line Items]                
Capital call notice paid $ 175,200              
Mountain Valley Pipeline | MVP Joint Venture | Scenario, Forecast                
Schedule of Equity Method Investments [Line Items]                
Capital call notice paid       $ 280,800        
MVP Southgate Project | Minimum                
Schedule of Equity Method Investments [Line Items]                
Estimated project cost     $ 350,000          
MVP Southgate Project | Maximum                
Schedule of Equity Method Investments [Line Items]                
Estimated project cost     $ 500,000          
MVP Southgate Project | Scenario, Forecast                
Schedule of Equity Method Investments [Line Items]                
Natural gas interstate pipeline (in miles) | mi             70  
MVP Southgate Project | EQM | MVP Joint Venture                
Schedule of Equity Method Investments [Line Items]                
Ownership percentage   32.70%     32.70%      
MVP Southgate Project | MVP Joint Venture | Scenario, Forecast                
Schedule of Equity Method Investments [Line Items]                
Capital call notice paid       $ 7,700