Debt Instrument, Debt Covenant, Debt to Total Capitalization Ratio

No definition available.

Name:	eqt_DebtInstrumentDebtCovenantDebttoTotalCapitalizationRatio
Namespace Prefix:	eqt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Maximum Debt to Capital Ratio

+ References

No definition available.

+ Details

Name:	eqt_DebtInstrumentMaximumDebttoCapitalRatio
Namespace Prefix:	eqt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Debt Instrument, Redemption Price, Consideration Paid Per $1,000 of Outstanding Principle Amount

+ References

No definition available.

+ Details

Name:	eqt_DebtInstrumentRedemptionPriceConsiderationPaidPer1000ofOutstandingPrincipleAmount
Namespace Prefix:	eqt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt Instrument, Redemption Price Per $1,000 of Outstanding Principal Amount

+ References

No definition available.

+ Details

Name:	eqt_DebtInstrumentRedemptionPricePer1000ofOutstandingPrincipalAmount
Namespace Prefix:	eqt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Debt Instrument, Redemption Price, Premium Per $1,000 of Outstanding Principal

+ References

No definition available.

+ Details

Name:	eqt_DebtInstrumentRedemptionPricePremiumPer1000ofOutstandingPrincipal
Namespace Prefix:	eqt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

This element represents the number of times the line of credit facility can be requested to be extended.

+ References

No definition available.

+ Details

Name:	eqt_LineOfCreditFacilityExtensionsNumber
Namespace Prefix:	eqt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

This element represents the number of financial institutions funding the borrowings of the entity on a pro-rata basis.

+ References

No definition available.

+ Details

Name:	eqt_LineOfCreditFacilityUnderwritingSyndicateFinancialInstitutionsNumber
Namespace Prefix:	eqt_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Line of Credit Facility, Extension Term

+ References

No definition available.

+ Details

Name:	eqt_LineofCreditFacilityExtensionTerm
Namespace Prefix:	eqt_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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

- Definition

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

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
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_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 470
-Section 50
-Paragraph 3
-Subparagraph e
-URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchasedFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of the cost of borrowed funds accounted for as interest expense for debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.8)
-URI http://asc.fasb.org/extlink&oid=116634182&loc=SL114868664-224227

+ Details

Name:	us-gaap_InterestExpenseDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

- Definition

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.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(16))
-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

+ Details

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

- Definition

Average amount borrowed under the credit facility during the period.

+ References

No definition available.

+ Details

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

- Definition

The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The effective interest rate during the reporting period.

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityInterestRateDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Maximum amount borrowed under the credit facility at any time during the period.

+ References

No definition available.

+ Details

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

- Definition

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.

+ References

+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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

- References

No definition available.

+ Details

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

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 3
-Subparagraph (SX 210.12-04.(a))
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-Name Accounting Standards Codification
-Topic 470
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601

+ Details

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

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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

- Definition

Amount of long-term debt payable, sinking fund requirements, and other securities issued that are redeemable by holder at fixed or determinable prices and dates maturing in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References

+ Details

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

- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3255-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The excess of the (1) fair value of consideration transferred to the holders of a security in excess of (2) the carrying amount of the security reported on the registrant's balance sheet, which will be deducted from net earnings to derive net earnings available to common shareholders. This amount is generally an adjustment considered in the computation of earnings per share.

+ References

No definition available.

+ Details

Name:	us-gaap_RedemptionPremium
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

+ Details

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

- Details

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- Details

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- Details

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- Details

Name:	us-gaap_VariableRateAxis=us-gaap_EurodollarMember
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- Details

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Debt - Narrative (Details)				12 Months Ended
Debt - Narrative (Details)	Feb. 26, 2020 USD ($)	Feb. 03, 2020 USD ($)	May 31, 2019 USD ($)	Dec. 31, 2019 USD ($) financial_institution extension	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 18, 2020 USD ($)	Jan. 21, 2020 USD ($)
Debt Instrument [Line Items]
Principal value				$ 5,020,259,000	$ 4,724,920,000
Proceeds from issuance of long-term debt				1,000,000,000	$ 0	$ 0
Maturities of Senior Notes
Aggregate maturities in 2020				1,011,000,000
Aggregate maturities in 2021				1,774,000,000
Aggregate maturities in 2022				750,000,000
Aggregate maturities in 2023				10,000,000
Aggregate maturities in 2024				0
Aggregate maturities in 2025 and thereafter				1,365,000,000
Commitment fee paid to maintain credit facility					20.00%	20.00%
EQT $2.5 Billion Facility \| Revolving Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 2,500,000,000
Maturities of Senior Notes
Number of times the maturity date of the credit facility can be extended by one year \| extension				2
Extension term				1 year
Number of financial institutions underwriting credit facility of the entity \| financial_institution				19
Debt to total capitalization ratio				65.00%
Long-term line of credit				$ 300,000,000	$ 800,000,000
Letters of credit outstanding				$ 0	0
Commitment fee paid to maintain credit facility				20.00%
Remaining borrowing capacity				$ 2,200,000,000
Maximum amount of outstanding borrowings				1,100,000,000	1,600,000,000	$ 1,400,000,000
Average daily balance of loans outstanding				$ 340,000,000	$ 854,000,000	$ 191,000,000
Weighted average interest rates				3.80%	3.40%	2.80%
EQT $2.5 Billion Facility \| Revolving Credit Facility \| Base Rate
Maturities of Senior Notes
Basis spread on variable rate				0.50%
EQT $2.5 Billion Facility \| Revolving Credit Facility \| Eurodollar
Maturities of Senior Notes
Basis spread on variable rate				1.50%
EQT $2.5 Billion Facility \| Revolving Credit Facility \| Maximum
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 3,000,000,000.0
EQT $2.5 Billion Facility \| Revolving Credit Facility \| Subsequent Event
Maturities of Senior Notes
Letters of credit outstanding	$ 600,000,000
Remaining borrowing capacity	$ 1,400,000,000
EQT $2.5 Billion Facility \| Revolving Credit Facility \| Subsequent Event \| Base Rate
Maturities of Senior Notes
Basis spread on variable rate	0.75%
EQT $2.5 Billion Facility \| Revolving Credit Facility \| Subsequent Event \| Eurodollar
Maturities of Senior Notes
Basis spread on variable rate	1.75%
Senior Notes Due February 2025 \| Subsequent Event
Debt Instrument [Line Items]
Principal value								$ 1,000,000,000.0
Interest rate	6.875%							6.125%
Senior Notes Due February 2030 \| Subsequent Event
Debt Instrument [Line Items]
Principal value								$ 750,000,000
Interest rate	7.75%							7.00%
Floating rate notes due October 1, 2020
Debt Instrument [Line Items]
Principal value				500,000,000	$ 500,000,000
Floating rate notes due October 1, 2020 \| Subsequent Event
Maturities of Senior Notes
Repurchased face amount								$ 500,000,000
Redemption price, percentage		100.00%
Interest expense, debt		$ 1,200,000
2.50% notes due October 1, 2020
Debt Instrument [Line Items]
Principal value				$ 500,000,000	500,000,000
Interest rate				2.50%
2.50% notes due October 1, 2020 \| Subsequent Event
Maturities of Senior Notes
Repurchased face amount								$ 500,000,000
Redemption price, percentage		100.446%
Interest expense, debt		$ 4,200,000
Redemption premium		$ 2,200,000
4.875% notes due November 15, 2021
Debt Instrument [Line Items]
Principal value				$ 750,000,000	750,000,000
Interest rate				4.875%
4.875% notes due November 15, 2021 \| Scenario, Forecast
Maturities of Senior Notes
Repurchased face amount							$ 400,000,000
Redemption price per $1,000							1,020
Premium per $1,000							30
Consideration paid per $1,000							$ 990
EQM Midstream Notes
Debt Instrument [Line Items]
Principal value				$ 110,059,000	$ 114,720,000
Maturities of Senior Notes
Aggregate maturities in 2020				5,000,000.0
Aggregate maturities in 2021				5,200,000
Aggregate maturities in 2022				5,500,000
Aggregate maturities in 2023				5,800,000
Aggregate maturities in 2024				6,300,000
Aggregate maturities in 2025 and thereafter				$ 82,300,000
Unsecured Debt \| Term Loan Agreement
Debt Instrument [Line Items]
Principal value			$ 1,000,000,000.0
Proceeds from issuance of long-term debt			$ 1,000,000,000.0
Interest rate				1.00%
Average interest rate				3.10%
Maximum debt to capital ratio			65.00%
Unsecured Debt \| Term Loan Agreement \| Subsequent Event
Debt Instrument [Line Items]
Interest rate	1.25%
Senior Notes \| 8.125% Senior Notes
Debt Instrument [Line Items]
Repayments of debt			$ 700,000,000
Interest rate			8.125%