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EQM Midstream Partners, LP (Details) - USD ($) $ / shares in Units, $ in Millions			9 Months Ended
	Oct. 25, 2018	Oct. 23, 2018	Sep. 30, 2018
EQT Corporation | EQM
Subsidiary or equity method investee
Limited partner interest			6.70%
EQM
Subsidiary or equity method investee
Cash distribution declared			$ 17.2
EQM | Subsequent Event
Subsidiary or equity method investee
Distribution made to limited partner and general partner, cash distributions declared	$ 97.8
Cash distribution declared	24.3
Distribution made to general partner, cash distributions declared	2.5
Cash distribution declared related to IDRs	$ 71.0
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)		$ 1.115

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