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Derivative Instruments - Narrative (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2018 USD ($) Bcf MBbls	Dec. 31, 2017 Bcf MBbls
Derivative Instruments, Gain (Loss) [Line Items]
Maximum additional collateral as percentage of derivative liability	100.00%
Aggregate fair value of derivative instruments with credit-risk related contingencies	$ 109,200,000
Collateral posted	$ 0
Natural Gas Liquid Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Volume of derivative instruments (in Bcf, Mbbls) | MBbls	2,058	1,460
Cash flow hedging | Commodity derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Volume of derivative instruments (in Bcf, Mbbls) | Bcf	3,005	2,148

X

- Definition

The upper limit of the percentage of derivative liability that the entity may be required to post with counterparties.

+ References

No definition available.

+ Details

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Namespace Prefix:	eqt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959

+ Details

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Balance Type:	debit
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X

- Definition

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.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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X

- Definition

The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4H
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624258-113959

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Nominal volume used to calculate payments on a derivative instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	num:volumeItemType
Balance Type:	na
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- Details

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Namespace Prefix:
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- Details

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Namespace Prefix:
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X

- Details

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Period Type: