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EQGP Holdings, LP (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  | 9 Months Ended
--- | --- | --- | --- | ---
Nov. 14, 2018 | Oct. 23, 2018 | May 22, 2018 | Sep. 30, 2018
General Partner Common |  |  |  |
Class of Stock [Line Items] |  |  |  |
Incentive distribution rights distributed in respect of each common unit and general partner unit (in dollars per share) |  |  |  | $ 0.5250
Affiliated Entity | Limited Partner Common |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of common units (in shares) |  |  |  | 276,008,766
EQGP |  |  |  |
Class of Stock [Line Items] |  |  |  |
Percentage of all incremental cash distributed (up to) |  |  |  | 48.00%
EQGP | Subsequent Event |  |  |  |
Class of Stock [Line Items] |  |  |  |
Cash distribution declared (in dollars per share) |  | $ 0.315 |  |
Cash distribution declared |  | $ 95.3 |  |
EQGP | General Partner |  |  |  |
Class of Stock [Line Items] |  |  |  |
General partner interest |  |  |  | 1.20%
EQGP | Affiliated Entity | Limited Partner Common |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of common units (in shares) |  |  |  | 21,811,643
EQGP | Affiliated Entity | General Partner |  |  |  |
Class of Stock [Line Items] |  |  |  |
Number of general partner units (in shares) |  |  |  | 1,443,015
IDR Transaction | EQGP |  |  |  |
Class of Stock [Line Items] |  |  |  |
Equity interest issued or issuable, number of shares (in shares) |  |  | 36,293,766 |
EQGP | Affiliated Entity | Limited Partner Common |  |  |  |
Class of Stock [Line Items] |  |  |  |
Limited partner interest |  |  |  | 91.30%
EQM | EQGP | Affiliated Entity | Limited Partner Common |  |  |  |
Class of Stock [Line Items] |  |  |  |
Limited partner interest |  |  |  | 17.90%
Scenario, Forecast | EQGP |  |  |  |
Class of Stock [Line Items] |  |  |  |
Cash distributions paid | $ 87.0 |  |  |

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