Sale of Stock, Stock Dividend, Per Share

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ 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)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

The number of grants made 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=109197908&loc=d3e5070-113901

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- 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=109197908&loc=d3e5070-113901

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- 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=109197908&loc=d3e5070-113901

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ 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)(2)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

+ 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 (d)(2)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

The risk-free interest rate assumption that is used in valuing an option on its own shares.

+ 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 (f)(2)(iv)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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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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Share-Based Compensation Plans - Schedule of Executive Performance Incentive Programs (Details) $ / shares in Units, $ in Millions		12 Months Ended
	Nov. 12, 2018	Dec. 31, 2018 USD ($) $ / shares shares	Jan. 01, 2018 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock dividend (in dollars per share)	0.80
Performance Shares \| 2014 Executive Performance Incentive Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value (in dollars per share) \| $ / shares		$ 189.68
Risk-free interest rate		0.78%
Awards paid (in shares)		238,060,000
Value \| $		$ 45.2
Performance Shares \| 2015 Executive Performance Incentive Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value (in dollars per share) \| $ / shares		$ 141.11
Risk-free interest rate		1.10%
Awards paid (in shares)		274,767,000
Value \| $		$ 0.0
Performance Shares \| 2016 Executive Performance Incentive Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value (in dollars per share) \| $ / shares		$ 109.30
Risk-free interest rate		1.31%
Awards outstanding (in shares)		384,101	447,145
Non-vested shares, forfeited (in shares)		63,044
Performance Shares \| 2016 Executive Performance Incentive Program \| Equitrans Midstream Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)		130,393
Performance Shares \| 2017 Executive Performance Incentive Program, Equity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value (in dollars per share) \| $ / shares		$ 120.60
Risk-free interest rate		1.47%
Awards outstanding (in shares)		44,573	79,070
Non-vested shares, forfeited (in shares)		34,497
Performance Shares \| 2017 Executive Performance Incentive Program, Equity \| Equitrans Midstream Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)		7,020
Performance Shares \| 2017 Executive Performance Incentive Program, Liability
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value (in dollars per share) \| $ / shares		$ 59.90
Risk-free interest rate		2.61%
Awards outstanding (in shares)		105,018	117,530
Non-vested shares, forfeited (in shares)		12,512
Performance Shares \| 2017 Executive Performance Incentive Program, Liability \| Equitrans Midstream Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)		43,134
Performance Shares \| 2018 Executive Performance Incentive Program, Equity
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value (in dollars per share) \| $ / shares		$ 76.53
Risk-free interest rate		1.97%
Awards outstanding (in shares)		107,340
Number of shares granted (in shares)		172,350
Non-vested shares, forfeited (in shares)		65,010
Performance Shares \| 2018 Executive Performance Incentive Program, Equity \| Equitrans Midstream Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)		34,640
Performance Shares \| 2018 Executive Performance Incentive Program, Liability
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Grant date fair value (in dollars per share) \| $ / shares		$ 33.30
Risk-free interest rate		2.46%
Awards outstanding (in shares)		124,820
Number of shares granted (in shares)		142,890
Non-vested shares, forfeited (in shares)		18,070
Performance Shares \| 2018 Executive Performance Incentive Program, Liability \| Equitrans Midstream Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards outstanding (in shares)		57,240