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v3.10.0.1

Midstream Streamlining Transactions and Financing - Additional Information (Details) |  |  |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 23, 2018 USD ($) shares | May 22, 2018 USD ($) shares | May 01, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | May 21, 2018 | Apr. 25, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Payments to acquire businesses, gross |  |  |  |  | $ 0 | $ 818,957,000 |  |
Noncontrolling interest, decrease |  |  |  |  | $ 175,000,000 |  |  |
Drop-Down Transactions |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Equity interests issued and issuable (in shares) |  | $ 5,889,282 |  |  |  |  |  |
Payments to acquire businesses, gross |  | 1,150,000,000 |  |  |  |  |  |
Additional paid in capital, increase (decrease) |  | 15,500,000 |  |  |  |  |  |
Noncontrolling interest, decrease |  | 20,300,000 |  |  |  |  |  |
Deferred tax liabilities, increase (decrease) |  | 4,800,000 |  |  |  |  |  |
IDR Transaction |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Additional paid in capital, increase (decrease) |  | (35,100,000) |  |  |  |  |  |
Increase from business combination |  | 46,100,000 |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets |  | $ 11,000,000 |  |  |  |  |  |
Midstream Mergers |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Additional paid in capital, increase (decrease) | $ (138,800,000) |  |  |  |  |  |  |
Increase from business combination | 189,100,000 |  |  |  |  |  |  |
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets | $ 50,300,000 |  |  |  |  |  |  |
EQM | Senior Notes | Senior Notes Due 2023 |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 4.75% | 4.75% |  |  |
Face amount |  |  |  | $ 1,100,000,000.0 | $ 1,100,000,000.0 |  |  |
EQM | Senior Notes | Senior Notes Due 2028 |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 5.50% | 5.50% |  |  |
Face amount |  |  |  | $ 850,000,000 | $ 850,000,000 |  |  |
EQM | Senior Notes | Senior Notes Due 2048 |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Interest rate, stated percentage |  |  |  | 6.50% | 6.50% |  |  |
Face amount |  |  |  | $ 550,000,000 | $ 550,000,000 |  |  |
EQM | Senior Notes | The Notes |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Proceeds from debt |  |  |  | 2,465,800,000 |  |  |  |
Unamortized discount |  |  |  | 11,800,000 | 11,800,000 |  |  |
Debt issuance costs, gross |  |  |  | 22,400,000 | 22,400,000 |  |  |
EQM | EQM Term Loan Facility |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  |  |  |  |  | $ 2,500,000,000.0
EQM | Revolving credit facility |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 1,000,000,000 | $ 1,000,000,000 |  |  |
EQM | Gulfport Transaction |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Payments to acquire businesses and interest in affiliates |  |  | $ 175,000,000 |  |  |  |  |
EQM | Midstream Mergers |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Equity interest issued or issuable, number of shares (in shares) | shares | 34,000,000.0 |  |  |  |  |  |  |
Repayments of debt | $ 260,000,000 |  |  |  |  |  |  |
EQM | Midstream Mergers | Indirect Wholly Owned Subsidiary |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Equity interest issued or issuable, number of shares (in shares) | shares | 9,554,530 |  |  |  |  |  |  |
EQGP | IDR Transaction |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Equity interest issued or issuable, number of shares (in shares) | shares |  | 36,293,766 |  |  |  |  |  |
Rice Midstream Partners, LP | Midstream Mergers |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Common share conversion ratio | 0.3319 |  |  |  |  |  |  |
SpinCo |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Distribution rate of common stock |  |  |  | 80.10% | 80.10% |  |  |
Strike Force Midstream LLC | Strike Force Midstream Holdings |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
General partner interest |  |  |  |  | 75.00% |  |  |
Strike Force Midstream LLC | EQM |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Ownership percentage by parent |  |  | 25.00% | 100.00% | 100.00% |  |  |
EQGP | IDR Transaction |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Ownership percentage by parent |  | 91.30% |  |  |  |  | 90.10% |

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