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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