Financial Statements	3 Months Ended
Financial Statements	Mar. 31, 2024
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Financial Statements	Financial Statements Nature of Business. The Company's operating subsidiaries provide midstream services to the Company's customers in Pennsylvania, West Virginia and Ohio through three primary assets: the gathering system, which includes predominantly dry gas gathering systems of high-pressure gathering lines; the transmission system, which includes FERC-regulated interstate pipelines and storage systems; and the water network, which primarily consists of water pipelines and other facilities that support well completion activities and produced water handling activities. Basis of Presentation. References in these financial statements to Equitrans Midstream or the Company refer collectively to Equitrans Midstream Corporation and its consolidated subsidiaries for all periods presented, unless otherwise indicated. The accompanying unaudited consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (GAAP) for interim financial information and with the requirements of Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by GAAP for complete financial statements. In the opinion of management, these unaudited consolidated financial statements include all adjustments (consisting of only normal, recurring adjustments, unless otherwise disclosed in this Quarterly Report on Form 10-Q) necessary for a fair presentation of the financial position of the Company as of March 31, 2024, the results of its operations, cash flows and equity for the three months ended March 31, 2024 and 2023. The consolidated balance sheet at December 31, 2023 has been derived from the audited financial statements at that date, but does not include all of the information and notes required by GAAP for complete financial statements. This Quarterly Report on Form 10-Q should be read in conjunction with the Company's Annual Report on Form 10-K for the year ended December 31, 2023, which includes all disclosures required by GAAP. Due to, among other things, the seasonal nature of the Company's utility customer contracts, as well as producers’ well completion activities and varying needs for fresh and produced water (which are primarily driven by horizontal lateral lengths and the number of completion stages per well), the interim statements for the three months ended March 31, 2024 are not necessarily indicative of the results that may be expected for the year ending December 31, 2024. For further information, refer to the Company's consolidated financial statements and related notes in the Company's Annual Report on Form 10-K for the year ended December 31, 2023, as well as Part I, "Item 2. Management's Discussion and Analysis of Financial Condition and Results of Operations" contained herein. Recently Issued Accounting Standards. In November 2023, the FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures, which provides improvements to reportable segment disclosures and is intended to enhance the disclosures regarding significant segment expenses. The guidance is applicable to all public entities that are required to report segment information in accordance with Topic 280 and is to be applied retrospectively to all prior periods presented in the financial statements. The Company is currently evaluating the potential impact of adopting this standard on its financial statements and related disclosures. In December 2023, the FASB issued ASU 2023-09, Income Taxes: Improvements to Income Tax Disclosures, which provides improvements to income tax disclosures and is intended to benefit investors by providing more detailed income tax disclosures that would be useful in making capital allocation decisions. The guidance is applicable to all public entities required to report income taxes in accordance with ASC 740 and should be applied prospectively, but retrospective application is permitted. The standard requires disaggregated information about a reporting entity’s effective tax rate reconciliation, information on income taxes paid, and various other disclosure changes. The Company is currently evaluating the potential impact of adopting this standard on its financial statements and related disclosures.

Equitrans Midstream Corp 10-Q