Share-Based Compensation Plans - Non-Employee Directors' Share Based Awards (Details) - Non-employee Directors' Share-Based Awards - $ / shares	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)	191,541
Shares granted (in shares)	37,620	24,110	17,900
Weighted average fair value, granted (in dollars per share)	$ 52.13	$ 75.52	$ 89.78
EQT Midstream
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)	17,760
Shares granted (in shares)	2,610	2,220	2,580
Weighted average fair value, granted (in dollars per share)	$ 75.46	$ 88.00	$ 58.79
EQGP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)	11,449
Shares granted (in shares)	8,270	2,910
Weighted average fair value, granted (in dollars per share)	$ 21.57	$ 28.77

The weighted average fair value at grant date for equity-based awards issued and vested 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).

No definition available.

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- 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.

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- Definition

Net number of non-option equity instruments granted to participants.

+ References

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- Definition

Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(i)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(ii)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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