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- Definition

Duration of Firm Capacity Commitments

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Firms Capacity Commitments Per Day

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Gas and Oil, Length of Natural Gas Pipeline

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- Definition

Incentive Distribution, Distribution Declared

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- Definition

Partners' Capital Account, Percent, Contributed

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Subordinated Units, Convertible, Conversion, Ratio

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- Definition

Percentage of voting equity interests acquired at the acquisition date in the business combination.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Number of common units of ownership outstanding of a limited liability company (LLC).

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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No definition available.

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- Definition

Amount of equity impact of cash distributions declared to unit-holder of limited liability company (LLC).

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Per unit of ownership amount of cash distributions declared to unit-holder of a limited liability company (LLC).

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Amount of equity impact of cash distribution declared to unit-holder of limited partnership (LP).

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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The expense recorded to reduce the value of oil and gas assets consisting of proved properties and unproved properties as the estimate of future successful production from these properties is reduced.

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The number of units or percentage investment held by one or more members or limited partners of the LLC or LP.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

The number of units sold in a public offering of each class of partners' capital account. Units represent shares of ownership of the general, limited, and preferred partners.

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The cash inflow from a borrowing with the highest claim on the assets of the entity in case of bankruptcy or liquidation (with maturities initially due after one year or beyond the operating cycle, if longer).

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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EQT Midstream Partners, LP - Additional Information (Details)										1 Months Ended		12 Months Ended
	Feb. 14, 2017 USD ($)	Jan. 19, 2017 USD ($) $ / shares	Oct. 26, 2016 USD ($)	Oct. 13, 2016 USD ($)	Apr. 15, 2015 USD ($)	Mar. 30, 2015 USD ($)	Mar. 17, 2015 USD ($)	Feb. 17, 2015	May 07, 2014 USD ($)	Nov. 30, 2016 USD ($)	Jul. 31, 2012 shares	Dec. 31, 2016 USD ($) Bcf / d	Dec. 31, 2015 USD ($) Bcf / d mi shares	Dec. 31, 2014 USD ($)	Feb. 09, 2017 shares	Jan. 21, 2016	Aug. 31, 2014 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum borrowing capacity												$ 1,500,000,000.0
Impairment of long-lived assets												66,687,000	$ 122,469,000	$ 267,339,000
Principal value												3,318,200,000	2,818,200,000
Revolving Credit Facility
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term line of credit												0	$ 0
Unallocated Expenses
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Impairment of long-lived assets												$ 59,700,000
Mountain Valley Pipeline
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Natural gas interstate pipeline (in miles) \| mi													300
NWV Gathering
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total consideration							$ 925,700,000
EQT Energy Supply, LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total consideration					$ 124,300,000
MVP Holdco
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of membership interest						100.00%
MVP Joint Venture
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total consideration						$ 54,200,000
Percentage of capital contributions						100.00%
Firms capacity commitments per day (in Bcf per day) \| Bcf / d												2.0
Duration of firm capacity commitments (in years)												20 years
Allegheny Valley Connector LLC and Rager Mountain Storage Company LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total consideration				$ 275,000,000
Ownership interest (as a percent)				100.00%
EQM
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in IPO (in shares) \| shares											17,339,718
Subordinated units, convertible, conversion, ratio								1
Maximum borrowing capacity												$ 750,000,000
EQM \| General Partner
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in IPO (in shares) \| shares													25,255
EQM \| Revolving Credit Facility
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Long-term line of credit												0	$ 299,000,000
EQM \| Senior Notes
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Interest rate																	4.00%
Principal value																	$ 500,000,000.0
EQM \| Senior Notes \| EQM 4.125% Senior Notes due 2026
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Interest rate										4.125%
Principal value										$ 500,000,000
Proceeds from issuance of senior long-term debt										$ 491,400,000
EQM \| Line of credit \| Revolving Credit Facility
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum borrowing capacity			$ 500,000,000
Debt instrument, term (in days)			364 days
Non-renewal notice (in days)			60 days
Basis spread on variable rate			10.00%
Long-term line of credit												$ 0
EQM \| MVP Joint Venture \| Variable Interest Entity, Not Primary Beneficiary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ownership percentage												45.50%
EQM \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash distribution declared (in dollars per share) \| $ / shares		$ 0.85
Common unit, outstanding (in shares) \| shares															80,581,758
EQM \| Subsequent Event \| MVP Joint Venture \| Variable Interest Entity, Not Primary Beneficiary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ownership percentage															45.50%
EQM \| MVP Joint Venture \| Variable Interest Entity, Not Primary Beneficiary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Ownership percentage																45.50%
EQT Gathering, LLC
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Payments for gathering system									$ 1,180,000,000
EQT \| MVP Joint Venture
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Firms capacity commitments per day (in Bcf per day) \| Bcf / d													1.29
EQGP \| Scenario, Forecast
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash distribution declared	$ 47,900,000
EQGP \| Scenario, Forecast \| Limited Partner
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash distribution declared in respect of limited partner and general partner interest	18,500,000
EQGP \| Scenario, Forecast \| General Partner
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash distribution declared in respect of limited partner and general partner interest	1,800,000
Incentive distribution rights declared	$ 27,600,000
EQGP \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cash distribution declared in respect of limited partner and general partner interest		$ 47,100,000