Subsequent Events	9 Months Ended
Sep. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On October 24, 2018, the Company’s Board of Directors approved the completion of the Separation by means of a pro-rata distribution (the Distribution) of 80.1% of the outstanding common stock of Equitrans Midstream to the Company’s shareholders of record as of the close of business on November 1, 2018 (the Record Date). Pursuant to the plan of Distribution approved by the Company’s Board of Directors, each Company shareholder will receive 0.80 shares of Equitrans Midstream common stock for every one share of the Company’s common stock held as of the close of business on the Record Date. Shareholders will receive cash in lieu of fractional shares of Equitrans Midstream common stock. After considering that EQT will retain an additional 19.9% of Equitrans Midstream's common stock, total Equitrans Midstream shares outstanding after the Distribution are expected to be approximately 255 million shares. In connection with the Separation, the Company and its subsidiaries will enter into certain agreements with Equitrans Midstream to implement the legal and structural separation between the two companies, govern the relationship between the Company and Equitrans Midstream after completion of the Separation, and allocate between the Company and Equitrans Midstream, various assets, liabilities and obligations, including, among other things, employee benefits, litigation, contracts, equipment, real property, intellectual property and tax-related assets and liabilities. These agreements include a Separation and Distribution Agreement, Tax Matters Agreement, Employee Matters Agreement, Transition Services Agreement and Shareholder and Registration Rights Agreement, the form of which has been approved by the Company’s Board of Directors. The accompanying unaudited Condensed Consolidated Financial Statements include the historical results of Equitrans Midstream, as the Distribution is expected to be effective at 11:59 p.m. eastern time on November 12, 2018, which is after the most recent period reported in this Form 10-Q. In future filings, the historical results of the businesses that comprise Equitrans Midstream Corporation will be reported as discontinued operations in the Company’s Consolidated Financial Statements. As a result of the Separation and Distribution, the accompanying unaudited, interim Condensed Consolidated Financial Statements are not indicative of the Company’s future financial position, results of operations or cash flows.

Subsequent Events

On October 24, 2018, the Company’s Board of Directors approved the completion of the Separation by means of a pro-rata distribution (the Distribution) of 80.1% of the outstanding common stock of Equitrans Midstream to the Company’s shareholders of record as of the close of business on November 1, 2018 (the Record Date). Pursuant to the plan of Distribution approved by the Company’s Board of Directors, each Company shareholder will receive 0.80 shares of Equitrans Midstream common stock for every one share of the Company’s common stock held as of the close of business on the Record Date. Shareholders will receive cash in lieu of fractional shares of Equitrans Midstream common stock. After considering that EQT will retain an additional 19.9% of Equitrans Midstream's common stock, total Equitrans Midstream shares outstanding after the Distribution are expected to be approximately 255 million shares.

In connection with the Separation, the Company and its subsidiaries will enter into certain agreements with Equitrans Midstream to implement the legal and structural separation between the two companies, govern the relationship between the Company and Equitrans Midstream after completion of the Separation, and allocate between the Company and Equitrans Midstream, various assets, liabilities and obligations, including, among other things, employee benefits, litigation, contracts, equipment, real property, intellectual property and tax-related assets and liabilities. These agreements include a Separation and Distribution Agreement, Tax Matters Agreement, Employee Matters Agreement, Transition Services Agreement and Shareholder and Registration Rights Agreement, the form of which has been approved by the Company’s Board of Directors.

The accompanying unaudited Condensed Consolidated Financial Statements include the historical results of Equitrans Midstream, as the Distribution is expected to be effective at 11:59 p.m. eastern time on November 12, 2018, which is after the most recent period reported in this Form 10-Q. In future filings, the historical results of the businesses that comprise Equitrans Midstream Corporation will be reported as discontinued operations in the Company’s Consolidated Financial Statements. As a result of the Separation and Distribution, the accompanying unaudited, interim Condensed Consolidated Financial Statements are not indicative of the Company’s future financial position, results of operations or cash flows.