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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 |  |  |  |

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