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

Represents the percentage of the fair value of cash and cash equivalent investments to the fair value of total plan assets held as on the measurement date.

No definition available.

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

This element represents the percentage of the fair value of equity securities of domestic companies to the fair value of total plan assets held as on the measurement date.

No definition available.

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

Represents the percentage of the fair value of fixed income securities to the fair value of total plan assets held as on the measurement date.

No definition available.

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

This element represents the percentage of the fair value of equity securities in foreign companies to the fair value of total plan assets held as on the measurement date.

No definition available.

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

Represents the targeted maximum percentage of investments in cash and cash equivalent to total plan assets, which is presented on a weighted-average basis for the next fiscal year.

No definition available.

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

Represents the targeted maximum percentage of investments in alternative fixed income securities to total plan assets, which is presented on a weighted-average basis for the next fiscal year.

No definition available.

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

Represents the targeted minimum percentage of investments in alternative fixed income securities to total plan assets, which is presented on a weighted-average basis for the next fiscal year.

No definition available.

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

Represents the targeted minimum percentage of investments in cash and cash equivalent to total plan assets, which is presented on a weighted-average basis for the next fiscal year.

No definition available.

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

This element represents the targeted maximum percentage of investments in equity securities of domestic companies to total plan assets, which is presented on a weighted-average basis for the next fiscal year.

No definition available.

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

This element represents the targeted minimum percentage of investments in equity securities of domestic companies to total plan assets, which is presented on a weighted-average basis for the next fiscal year.

No definition available.

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

Represents the targeted maximum percentage of investments in fixed income securities to total plan assets, which is presented on a weighted-average basis for the next fiscal year.

No definition available.

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

Represents the targeted minimum percentage of investments in fixed income securities to total plan assets, which is presented on a weighted-average basis for the next fiscal year.

No definition available.

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

This element represents the targeted maximum percentage of investments in equity securities of foreign companies to total plan assets, which is presented on a weighted-average basis for the next fiscal year.

No definition available.

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

This element represents the targeted minimum percentage of investments in equity securities of foreign companies to total plan assets, which is presented on a weighted-average basis for the next fiscal year.

No definition available.

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

- Details

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

Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 5

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2446-114920

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (d)(1)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph d(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.