Share-Based Compensation Plans - Schedule of Value Driver Award Programs (Details) - Value Driver Award $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2021 USD ($) $ / shares shares
2017 Value Driver Performance Share Unit Award Program \| Equitrans Midstream Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares) \| shares	95,452
2017 Value Driver Performance Share Unit Award Program \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value, granted (in dollars per share) \| $ / shares	$ 65.40
Cash paid \| $	$ 14.0
2017 Value Driver Performance Share Unit Award Program \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value, granted (in dollars per share) \| $ / shares	$ 65.40
Cash paid \| $	$ 4.0
2018 Value Driver Performance Share Unit Award Program \| Equitrans Midstream Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares) \| shares	130,355
2018 Value Driver Performance Share Unit Award Program \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value, granted (in dollars per share) \| $ / shares	$ 56.92
Cash paid \| $	$ 4.9
2018 Value Driver Performance Share Unit Award Program \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value, granted (in dollars per share) \| $ / shares	$ 56.92
Cash paid \| $	$ 1.2
2019 EQT Value Driver Performance Share Unit Award Program \| Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value, granted (in dollars per share) \| $ / shares	$ 18.89
Cash paid \| $	$ 1.7
2019 EQT Value Driver Performance Share Unit Award Program \| Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average fair value, granted (in dollars per share) \| $ / shares	$ 18.89
Cash paid \| $	$ 1.7

Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instruments Other Than Options, Vested In Period, Cash Paid

No definition available.

+ Details

Name:	eqt_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodCashPaid
Namespace Prefix:	eqt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

+ Details

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- 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

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

- Details

Name:	us-gaap_AwardTypeAxis=eqt_ValueDriverAwardMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=eqt_A2017ValueDriverPerformanceShareUnitAwardProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=eqt_EquitransMidstreamEmployeesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VestingAxis=us-gaap_ShareBasedCompensationAwardTrancheTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=eqt_A2018ValueDriverPerformanceShareUnitAwardProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_PlanNameAxis=eqt_A2019EQTValueDriverPerformanceShareUnitAwardProgramMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: