XML 43 R33.htm IDEA: XBRL DOCUMENT
v3.7.0.1

Investment Nonconsolidated Entity (Details) $ in Millions |  |  | 1 Months Ended | 3 Months Ended
--- | --- | --- | --- | ---
May 12, 2017 USD ($) | Apr. 13, 2017 USD ($) | Feb. 28, 2017 USD ($) | Mar. 31, 2017 USD ($) Bcf / d mi | Mar. 31, 2016 USD ($)
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Percent interest to require approval |  |  |  | 66.67% |
Issuance of performance guarantee |  |  |  | $ 91.0 |
Mountain Valley Pipeline |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Natural gas interstate pipeline (in miles) | mi |  |  |  | 300 |
MVP Joint Venture |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Firms capacity commitments per day (in bcf per day) | Bcf / d |  |  |  | 2.0 |
Duration of firm capacity commitments (in years) |  |  |  | 20 years |
EQM |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Total investments |  |  |  | $ 4.3 | $ 1.6
EQT Corporation and Subsidiaries | MVP Joint Venture |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Firms capacity commitments per day (in bcf per day) | Bcf / d |  |  |  | 1.29 |
MVP Joint Venture |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Capital call notice |  |  | $ 40.2 |  |
MVP Joint Venture | Scenario, Forecast |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Payments to acquire equity method investments | $ 18.1 |  |  |  |
MVP Joint Venture | Subsequent Event |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Payments to acquire equity method investments |  | $ 22.1 |  |  |
Variable Interest Entity, Not Primary Beneficiary | MVP Joint Venture |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Maximum financial statement exposure |  |  |  | $ 328.3 |
Variable Interest Entity, Not Primary Beneficiary | MVP Joint Venture | Mountain Valley Pipeline |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Percentage of remaining obligations |  |  |  | 33.00% |
Variable Interest Entity, Not Primary Beneficiary | EQM | MVP Joint Venture |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Ownership percentage |  |  |  | 45.50% |

X
- Definition Duration of Firm Capacity Commitments + References No definition available. + Details
Name: | eqt_DurationofFirmCapacityCommitments
Namespace Prefix: | eqt_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Equity Method Investment, Capital Call Notice + References No definition available. + Details
Name: | eqt_EquityMethodInvestmentCapitalCallNotice
Namespace Prefix: | eqt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Equity Method Investments, Percent Interest to Require Approval + References No definition available. + Details
Name: | eqt_EquityMethodInvestmentsPercentInteresttoRequireApproval
Namespace Prefix: | eqt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Firms Capacity Commitments Per Day + References No definition available. + Details
Name: | eqt_FirmsCapacityCommitmentsPerDay
Namespace Prefix: | eqt_
Data Type: | us-types:flowItemType
Balance Type: | na
Period Type: | duration

X
- Definition Gas and Oil, Length of Natural Gas Pipeline + References No definition available. + Details
Name: | eqt_GasandOilLengthofNaturalGasPipeline
Namespace Prefix: | eqt_
Data Type: | num:lengthItemType
Balance Type: | na
Period Type: | instant

X
- Definition Issuance of Performance Guarantee + References No definition available. + Details
Name: | eqt_IssuanceofPerformanceGuarantee
Namespace Prefix: | eqt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Indicates, if estimable, (as a percentage) the approximate extent to which the proceeds from liquidation of any assets held either as collateral or by third parties would be expected to cover the maximum potential amount of future payments under the guarantee or each group of similar guarantees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6851643&loc=d3e12069-110248 + Details
Name: | us-gaap_GuaranteeObligationsLiquidationProceedsPercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(12)) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(10)) -URI http://asc.fasb.org/extlink&oid=6879464&loc=d3e573970-122913 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(13)(f)) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
Name: | us-gaap_IncomeLossFromEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3213-108585 + Details
Name: | us-gaap_PaymentsToAcquireEquityMethodInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

X
- Definition The reporting entity's maximum amount of exposure to loss as a result of its involvement with the Variable Interest Entity (VIE). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph b -URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5728-111685 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64801991&loc=d3e5747-111685 + Details
Name: | us-gaap_VariableInterestEntityEntityMaximumLossExposureAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | us-gaap_CapitalizedCostsOfUnprovedPropertiesExcludedFromAmortizationByPropertyOrProjectAxis=eqt_MountainValleyPipelineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=eqt_MVPJointVentureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=eqt_EQTMidstreamPartnersLPMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=eqt_EQTCorporationAndSubsidiariesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=eqt_MVPJointVentureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableInterestEntitiesByClassificationOfEntityAxis=us-gaap_VariableInterestEntityNotPrimaryBeneficiaryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_GuaranteeObligationsByNatureAxis=eqt_MountainValleyPipelineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |