This element represents the aggregate fair value of the restricted stock forfeited during the reporting period.

No definition available.

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- Definition

This element represents the aggregate fair value of the restricted stock granted during the reporting period.

+ References

No definition available.

+ Details

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- Definition

Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants From Multiplier

+ References

No definition available.

+ Details

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- Definition

Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Increase In Weighted Average Grant Date Fair Value

+ References

No definition available.

+ Details

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- Definition

Share Based Compensation Arrangement by Share Based Payment Award, Equity Instruments Other than Options, Grants In Period, Total Fair Value

+ References

No definition available.

+ Details

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- Definition

Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant From Multiplier

+ References

No definition available.

+ Details

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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

+ Details

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

+ References

+ Details

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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

+ Details

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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

+ Details

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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://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(ii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Definition

Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

+ Details

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- References

No definition available.

+ Details

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- Definition

The net total number of shares (or other type of equity) under an equity-based award plan, other than a stock option plan, that were granted, vested and forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

+ Details

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Period Type:	duration

- Definition

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

+ References

+ Details

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Period Type:	duration

- 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://www.xbrl.org/2003/role/disclosureRef
-Topic 718
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (d)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480429/718-10-50-2

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- Definition

The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

+ References

+ Details

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- References

No definition available.

+ Details

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- Definition

Intrinsic value of nonvested award under share-based payment arrangement. Excludes share and unit options.

+ References

No definition available.

+ Details

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Share-Based Compensation Plans - Schedule of Executive Performance Incentive Programs (Details) - USD ($)	1 Months Ended	4 Months Ended	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Incentive PSU Programs – Equity Settled
Aggregate Fair Value
Increase in weighted average grant date fair value (in dollars per share)		$ 45.59
Performance Shares \| Incentive PSU Programs – Equity Settled
Non- Vested Shares
Non-vested shares, outstanding, beginning balance (in shares)		2,754,648	2,861,990	2,754,648	1,939,728
Non-vested shares, granted in period (in shares)			404,790	575,120	922,260
Non-vested shares, granted from multiplier (in shares)			409,383	162,183	61,076
Non-vested shares, vested (in shares)			(1,773,994)	(625,563)	(168,416)
Non-vested shares, forfeited (in shares)			(70,616)	(4,398)
Non-vested shares, outstanding, ending balance (in shares)			1,831,553	2,861,990	2,754,648	1,939,728
Weighted Average Fair Value
Weighted average fair value, outstanding, beginning balance (in dollars per share)		$ 16.08	$ 16.66	$ 16.08	$ 15.92
Weighted average fair value, granted in period (in dollars per share)	$ 75.32		38.79	29.73	23.44
Weighted average fair value, granted from multiplier (in dollars per share)			6.56	29.45	76.53
Weighted average fair value, vested (in dollars per share)			6.56	29.45	76.53
Weighted average fair value, forfeited (in dollars per share)			37.59	13.28
Weighted average fair value, outstanding, ending balance (in dollars per share)			$ 28.27	$ 16.66	$ 16.08	$ 15.92
Aggregate Fair Value
Aggregate fair value, beginning balance		$ 44,281,509	$ 47,674,881	$ 44,281,509	$ 30,878,465
Aggregate fair value, granted in period			15,701,804	17,098,318	21,617,774
Aggregate fair value, granted from multiplier			2,685,552	4,776,289	4,674,146
Aggregate fair value, vested			(11,637,401)	(18,422,830)	(12,888,876)
Aggregate fair value, forfeited			(2,654,455)	(58,405)
Aggregate fair value, ending balance			$ 51,770,381	$ 47,674,881	$ 44,281,509	$ 30,878,465
Performance Shares \| Incentive PSU Programs – Equity Settled \| Equitrans Midstream Employees
Non- Vested Shares
Non-vested shares, outstanding, beginning balance (in shares)		9,550		9,550	7,020
Non-vested shares, outstanding, ending balance (in shares)					9,550	7,020
Performance Shares \| Incentive PSU Programs – Cash Settled
Non- Vested Shares
Non-vested shares, outstanding, beginning balance (in shares)		233,580	0	233,580	339,695
Non-vested shares, granted from multiplier (in shares)				81,753	32,350
Non-vested shares, vested (in shares)				(315,333)	(134,525)
Non-vested shares, forfeited (in shares)					(3,940)
Non-vested shares, outstanding, ending balance (in shares)				0	233,580	339,695
Weighted Average Fair Value
Weighted average fair value, outstanding, beginning balance (in dollars per share)		$ 29.32	$ 0	$ 29.32	$ 43.52
Weighted average fair value, granted from multiplier (in dollars per share)				29.32	76.53
Weighted average fair value, vested (in dollars per share)				29.32	76.53
Weighted average fair value, forfeited (in dollars per share)					29.45
Weighted average fair value, outstanding, ending balance (in dollars per share)				$ 0	$ 29.32	$ 43.52
Aggregate Fair Value
Aggregate fair value, beginning balance		$ 6,848,566	$ 0	$ 6,848,566	$ 14,782,424
Aggregate fair value, granted from multiplier				2,396,998	2,475,746
Aggregate fair value, vested				(9,245,564)	(10,293,571)
Aggregate fair value, forfeited					(116,033)
Aggregate fair value, ending balance				$ 0	$ 6,848,566	$ 14,782,424
Performance Shares \| Incentive PSU Programs – Cash Settled \| Equitrans Midstream Employees
Aggregate Fair Value
Shares settled during the period (in shares)					84,697	40,018