Name:	eqt_BusinessCombinationProFormaInformationDerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNetOfAcquireeSinceAcquisitionDateActual
Namespace Prefix:	eqt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Business Combination Pro Forma Information Revenue From Contract With Customer Excluding Assessed Tax of Acquiree Since Acquisition Date Actual

No definition available.

Name:	eqt_BusinessCombinationProFormaInformationRevenueFromContractWithCustomerExcludingAssessedTaxOfAcquireeSinceAcquisitionDateActual
Namespace Prefix:	eqt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Business Combination Pro Forma Information Revenue Not From Contract With Customer Other of Acquiree Since Acquisition Date Actual

No definition available.

Name:	eqt_BusinessCombinationProFormaInformationRevenueNotFromContractWithCustomerOtherOfAcquireeSinceAcquisitionDateActual
Namespace Prefix:	eqt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_BusinessAcquisitionLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

This element represents the amount of earnings or loss of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)
-URI https://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

Name:	us-gaap_BusinessCombinationProFormaInformationEarningsOrLossOfAcquireeSinceAcquisitionDateActual
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

This element represents the amount of revenue of the acquiree since the acquisition date included in the consolidated income statement for the reporting period.