EQT Midstream Partners, LP (Details) (USD $)	0 Months Ended	6 Months Ended
	May 07, 2014	Jun. 30, 2014
Subsidiary or equity method investee
Proceeds from offerings, net of underwriters' discount and estimated offering expenses		$ 902,451,000
Amount placed into a qualified trust account		342,744,000
Funds utilized in connection with the exchange of certain assets	157,300,000	157,256,000
EQT Midstream Partners
Subsidiary or equity method investee
Exchange amount	1,180,000,000
Number of common units issued to the public in an offering (in shares)	12,362,500
Proceeds from offerings, net of underwriters' discount and estimated offering expenses	902,500,000
Offering expenses	34,000,000
General partner's interest (as a percent)		2.00%
Limited partner's interest (as a percent)		34.40%
Common units (in shares)		3,959,952
Subordinated units (in shares)		17,339,718
Taxable gain for federal income tax purposes recognized	569,300,000
Amount placed into a qualified trust account		$ 500,000,000