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EQT Midstream Partners, LP (Details) - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Jul. 26, 2018
Jul. 24, 2018
Jun. 30, 2018
EQT Corporation | EQM      
Subsidiary or equity method investee      
Limited partner interest     6.70%
EQM      
Subsidiary or equity method investee      
Cash distribution declared     $ 16.8
EQM | Subsequent Event      
Subsidiary or equity method investee      
Distribution made to limited partner and general partner, cash distributions declared $ 94.3    
Cash distribution declared 23.8    
Distribution made to general partner, cash distributions declared 2.4    
Cash distribution declared related to IDRs $ 68.1    
General Partner | EQM      
Subsidiary or equity method investee      
Common unit, outstanding (in shares)     5,889,282
General Partner | EQM | Subsequent Event      
Subsidiary or equity method investee      
Cash distribution declared (in dollars per share)   $ 1.090