EQM Midstream Partners 10-Q 25 Oct 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information	9 Months Ended
	Sep. 30, 2018shares
Entity Information [Line Items]
Entity Registrant Name	EQM Midstream Partners, LP
Entity Central Index Key	1,540,947
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Amendment Flag	false
Current Fiscal Year End	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Common Units
Entity Information [Line Items]
Entity Common Units, Unit Outstanding	120,456,425
General Partner Units
Entity Information [Line Items]
Entity Common Units, Unit Outstanding	1,443,015

Statements of Consolidated Oper

Statements of Consolidated Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017
Income Statement [Abstract]
Operating revenues	[1],[2]	$ 364,584	$ 206,293	$ 1,110,307		$ 603,180
Operating expenses:
Operating and maintenance	[1],[3]	48,092	19,589	118,534		54,721
Selling, general and administrative	[1],[3]	29,038	18,758	88,490		51,970
Depreciation	[1]	43,567	22,244	126,957	[4]	64,191	[4]
Amortization of intangible assets	[1]	10,387	0	31,160	[4]	0	[4]
Total operating expenses	[1]	131,084	60,591	365,141		170,882
Operating income	[1]	233,500	145,702	745,166		432,298
Equity income	[1],[5]	16,087	6,025	35,836	[4]	15,413	[4]
Other income	[1]	1,345	637	3,193		3,576
Net interest expense	[1],[6]	41,005	9,426	76,740		26,014
Net income	[1]	209,927	142,938	707,455	[4],[7]	425,273	[4],[7]
Net income attributable to noncontrolling interests	[1]	0	0	3,346		0
Net income attributable to EQM	[1]	209,927	142,938	704,109		425,273
Calculation of limited partner interest in net income:
Net income attributable to EQM	[1]	209,927	142,938	704,109		425,273
Less pre-acquisition net income allocated to parent	[1]	(8,490)	0	(164,242)		0
Less general partner interest in net income – general partner units	[1]	(2,379)	(2,515)	(7,145)		(7,482)
Less general partner interest in net income – IDRs	[1]	(70,967)	(37,615)	(183,253)		(102,451)
Limited partner interest in net income	[1]	$ 128,091	$ 102,808	$ 349,469		$ 315,340
Net income per limited partner unit – basic and diluted (in dollars per share)	[1]	$ 1.14	$ 1.28	$ 3.73		$ 3.91
Weighted average limited partner units outstanding – basic and diluted (in shares)	[1]	111,980	80,603	93,746		80,603
Cash distributions declared per unit (in dollars per share)	[8]	$ 1.115	$ 0.98	$ 3.270	[1]	$ 2.805	[1]
[1]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of Rice Olympus Midstream LLC (ROM), Strike Force Midstream Holdings LLC (Strike Force) and Rice West Virginia Midstream LLC (Rice WV), which were acquired by EQM effective on May 1, 2018 (the May 2018 Acquisition), and Rice Midstream Partners LP (RMP), which was acquired by EQM effective on July 23, 2018 (the EQM-RMP Merger), because these transactions were between entities under common control.
[2]	Operating revenues included affiliate revenues from EQT Corporation and subsidiaries (collectively, EQT) of $276.9 million and $154.2 million for the three months ended September 30, 2018 and 2017, respectively, and $827.8 million and $445.8 million for nine months ended September 30, 2018 and 2017, respectively. See Note F.
[3]	Operating and maintenance expense included charges from EQT of $14.0 million and $10.7 million for the three months ended September 30, 2018 and 2017, respectively, and $38.4 million and $29.8 million for the nine months ended September 30, 2018 and 2017, respectively. Selling, general and administrative expense included charges from EQT of $25.7 million and $18.1 million for the three months ended September 30, 2018 and 2017, respectively, and $75.1 million and $49.7 million for the nine months ended September 30, 2018 and 2017, respectively. See Note F.
[4]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.
[5]	Represents equity income from Mountain Valley Pipeline, LLC (the MVP Joint Venture). See Note G.
[6]	Net interest expense included interest income on the Preferred Interest in EES of $1.6 million and $1.7 million for the three months ended September 30, 2018 and 2017, respectively, and $5.0 million and $5.1 million for the nine months ended September 30, 2018 and 2017, respectively.
[7]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.
[8]	Represents the cash distributions declared related to the period presented. See Note J.

Statements of Consolidated Op_2

Statements of Consolidated Operations (Unaudited) (Parenthetical) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Operating and maintenance	[1],[2]	$ 48,092	$ 19,589	$ 118,534	$ 54,721
Selling, general and administrative expenses	[1],[2]	29,038	18,758	88,490	51,970
EES
Interest income		1,600	1,700	5,000	5,100
EQT
Operating revenues		276,900	154,200	827,800	445,800
Operating and maintenance		14,000	10,700	38,400	29,800
Selling, general and administrative expenses		$ 25,700	$ 18,100	$ 75,100	$ 49,700
[1]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of Rice Olympus Midstream LLC (ROM), Strike Force Midstream Holdings LLC (Strike Force) and Rice West Virginia Midstream LLC (Rice WV), which were acquired by EQM effective on May 1, 2018 (the May 2018 Acquisition), and Rice Midstream Partners LP (RMP), which was acquired by EQM effective on July 23, 2018 (the EQM-RMP Merger), because these transactions were between entities under common control.
[2]	Operating and maintenance expense included charges from EQT of $14.0 million and $10.7 million for the three months ended September 30, 2018 and 2017, respectively, and $38.4 million and $29.8 million for the nine months ended September 30, 2018 and 2017, respectively. Selling, general and administrative expense included charges from EQT of $25.7 million and $18.1 million for the three months ended September 30, 2018 and 2017, respectively, and $75.1 million and $49.7 million for the nine months ended September 30, 2018 and 2017, respectively. See Note F.

Statements of Consolidated Cash

Statements of Consolidated Cash Flows (Unaudited) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2018		Sep. 30, 2017
Cash flows from operating activities:
Net income	[1],[2],[3]	$ 707,455		$ 425,273
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	[1],[2]	126,957		64,191
Amortization of intangible assets	[1],[2]	31,160		0
Equity income	[1],[2],[4]	(35,836)		(15,413)
AFUDC – equity	[2]	(3,585)		(4,128)
Non-cash long-term compensation expense	[2]	1,275		225
Changes in other assets and liabilities:
Accounts receivable	[2]	2,193		(1,106)
Accounts payable	[2]	28,173		1,848
Due to/from EQT affiliates	[2]	(14,730)		5,627
Other assets and other liabilities	[2]	22,420		3,686
Net cash provided by operating activities	[2]	865,482		480,203
Cash flows from investing activities:
Capital expenditures	[2]	(616,365)		(224,591)
Capital contributions to the MVP Joint Venture	[2]	(446,049)		(103,448)
May 2018 Acquisition from EQT	[5]	(1,193,160)		0
Principal payments received on the Preferred Interest	[2]	3,281		3,103
Net cash used in investing activities	[2]	(2,252,293)		(324,936)
Cash flows from financing activities:
Proceeds from credit facility borrowings	[2]	2,524,000		334,000
Payments on credit facility borrowings	[2]	(2,968,000)		(229,000)
Proceeds from issuance of long-term debt	[2]	2,500,000		0
Debt discount and issuance costs	[5]	(34,249)		(2,257)
Distributions paid to unitholders	[2]	(528,410)		(313,515)
Distributions paid to noncontrolling interest	[2]	(750)		0
Acquisition of 25% of Strike Force Midstream LLC	[2]	(175,000)		0
Capital contributions	[2]	15,672		216
Net contributions from EQT	[5]	3,660		0
Net cash provided by (used in) financing activities	[2]	1,336,923		(210,556)
Net change in cash and cash equivalents	[2]	(49,888)		(55,289)
Cash and cash equivalents at beginning of period	[2]	54,600	[5]	60,368
Cash and cash equivalents at end of period	[2]	4,712	[5]	5,079
Cash paid during the period for:
Interest, net of amount capitalized	[2]	42,652		31,091
Non-cash activity during the period for:
(Decrease) increase in capital contribution receivable from EQT	[2]	$ (11,758)		$ 758
[1]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of Rice Olympus Midstream LLC (ROM), Strike Force Midstream Holdings LLC (Strike Force) and Rice West Virginia Midstream LLC (Rice WV), which were acquired by EQM effective on May 1, 2018 (the May 2018 Acquisition), and Rice Midstream Partners LP (RMP), which was acquired by EQM effective on July 23, 2018 (the EQM-RMP Merger), because these transactions were between entities under common control.
[2]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.
[3]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.
[4]	Represents equity income from Mountain Valley Pipeline, LLC (the MVP Joint Venture). See Note G.
[5]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	[1],[2]	$ 4,712	$ 54,600
Accounts receivable (net of allowance for doubtful accounts of $717 and $446 as of September 30, 2018 and December 31, 2017, respectively)	[2]	58,358	60,551
Accounts receivable – affiliate	[2]	167,481	158,720
Other current assets	[2]	9,080	14,153
Total current assets	[2]	239,631	288,024
Property, plant and equipment	[2]	6,127,076	5,516,504
Less: accumulated depreciation	[2]	(518,718)	(405,665)
Net property, plant and equipment	[2]	5,608,358	5,110,839
Investment in unconsolidated entity	[2]	1,300,430	460,546
Goodwill	[2]	1,384,872	1,384,872
Intangible assets, net	[2]	586,500	617,660
Other assets	[2]	146,400	136,894
Total assets	[2]	9,266,191	7,998,835
Current liabilities:
Accounts payable	[2]	134,026	105,271
Due to related party	[2]	39,709	33,919
Capital contribution payable to MVP Joint Venture	[2]	463,733	105,734
Accrued interest	[2]	46,165	11,067
Accrued liabilities	[2]	16,401	20,995
Total current liabilities	[2]	700,034	276,986
Credit facility borrowings	[2]	22,000	466,000
Senior notes	[2]	3,455,296	987,352
Regulatory and other long-term liabilities	[2]	31,010	29,633
Total liabilities	[2]	4,208,340	1,759,971
Equity:
Predecessor equity	[2]	0	3,916,434
Noncontrolling interest	[2]	0	173,472
Common (120,456,425 and 80,581,758 units issued and outstanding at September 30, 2018 and December 31, 2017, respectively)	[2]	5,026,431	2,147,706
General partner (1,443,015 units issued and outstanding at September 30, 2018 and December 31, 2017)	[2]	31,420	1,252
Total equity	[2],[3]	5,057,851	6,238,864
Total liabilities and equity	[2]	$ 9,266,191	$ 7,998,835
[1]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.
[2]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.
[3]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.

Consolidated Balance Sheets (_2

Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Accounts receivable, for doubtful accounts	$ 717	$ 446
Common units issued (in shares)	120,456,425	80,581,758
Common units outstanding (in shares)	120,456,425	80,581,758
General partner interest, units issued (in shares)	1,443,015	1,443,015
General partner interest, units outstanding (in shares)	1,443,015	1,443,015

Statements of Consolidated Equi

Statements of Consolidated Equity (Unaudited) - USD ($) $ in Thousands		Total		Limited Partners Common	General Partner	Predecessor Equity		Noncontrolling Interest
Beginning balance at Dec. 31, 2016	[1]	$ 1,993,554		$ 2,008,510	$ (14,956)	$ 0		$ 0
Increase (Decrease) in Partners' Capital
Net income	[1]	425,273	[2],[3]	315,340	109,933	0
Capital contributions	[1]	2,624		2,576	48
Equity-based compensation plans	[1]	225		225
Distributions paid to unitholders	[1]	(313,515)		(215,556)	(97,959)
Ending balance at Sep. 30, 2017	[1]	2,108,161		2,111,095	(2,934)	0		0
Beginning balance at Dec. 31, 2017	[1]	6,238,864	[4]	2,147,706	1,252	3,916,434		173,472
Increase (Decrease) in Partners' Capital
Net income	[1]	707,455	[2],[3]	349,469	190,398	164,242		3,346
Capital contributions	[1]	3,917		3,851	66
Equity-based compensation plans	[1]	1,275		353		922
Distributions paid to unitholders	[1]	(528,410)		(299,724)	(160,296)	(68,390)
Net contributions from EQT		3,660				3,660	[1]
Distributions paid to noncontrolling interest	[1]	(750)						(750)
Acquisition of 25% of Strike Force Midstream LLC	[1]	(175,000)		1,068				(176,068)
May 2018 Acquisition from EQT	[1],[5]	(1,193,160)		243,137		(1,436,297)
EQM-RMP Merger	[1],[5]	0		2,580,571		(2,580,571)
Ending balance at Sep. 30, 2018	[1]	$ 5,057,851	[4]	$ 5,026,431	$ 31,420	$ 0		$ 0
[1]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.
[2]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of Rice Olympus Midstream LLC (ROM), Strike Force Midstream Holdings LLC (Strike Force) and Rice West Virginia Midstream LLC (Rice WV), which were acquired by EQM effective on May 1, 2018 (the May 2018 Acquisition), and Rice Midstream Partners LP (RMP), which was acquired by EQM effective on July 23, 2018 (the EQM-RMP Merger), because these transactions were between entities under common control.
[3]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.
[4]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.
[5]	Under common control accounting, any difference between consideration transferred and the net assets received at historical cost is recorded as an equity transaction. In addition, equity issued in a common control transaction is recorded at an amount equal to the carrying value of the net assets transferred, even if the equity issued has a readily determinable fair value. The EQM common units issued in the May 2018 Acquisition are valued at the excess of the net assets received by EQM over the cash consideration.

Statements of Consolidated Eq_2

Statements of Consolidated Equity (Unaudited) (Parenthetical)	May 01, 2018
Strike Force Midstream
Percentage of voting interests acquired	25.00%

Financial Statements

Financial Statements	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Financial Statements	Financial Statements Organization and Basis of Presentation EQM is a growth-oriented Delaware limited partnership. EQM Midstream Services, LLC (formerly known as EQT Midstream Services, LLC) (EQM General Partner), is a direct wholly owned subsidiary of EQGP Holdings, LP (formerly known as EQT GP Holdings, LP) (EQGP), and is the general partner of EQM. EQM was formed under the name EQT Midstream Partners, LP and changed its name to EQM Midstream Partners, LP in October 2018. The accompanying unaudited consolidated financial statements have been prepared in accordance with 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 Form 10-Q) necessary for a fair presentation of the financial position of EQM as of September 30, 2018 and December 31, 2017 , the results of its operations for the three and nine months ended September 30, 2018 and 2017 , and its cash flows and equity for the nine months ended September 30, 2018 and 2017 . Certain previously reported amounts have been reclassified to conform to the current year presentation. The balance sheet at December 31, 2017 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by GAAP for complete financial statements. EQM's consolidated financial statements have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control. The recast is for the period the acquired businesses were under the common control of EQT, which began on November 13, 2017 as a result of EQT's merger with Rice Energy Inc. (Rice) (the Rice Merger). EQM recorded the assets and liabilities acquired in the May 2018 Acquisition and the EQM-RMP Merger at their carrying amounts to EQT on the effective dates of the transactions. The consolidated financial statements are not necessarily indicative of the actual results of operations if EQM and the assets acquired in the May 2018 Acquisition and the EQM-RMP Merger had been operated together during the pre-acquisition periods. Due to the seasonal nature of EQM's utility customer contracts, the interim statements for the three and nine months ended September 30, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018 . For further information, refer to the consolidated financial statements and related footnotes for the year ended December 31, 2017 and "Management's Discussion and Analysis of Financial Condition and Results of Operations," in each case as included in EQM's Current Report on Form 8-K as filed with the SEC on June 12, 2018. Recently Issued Accounting Standards In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers . The standard requires an entity to recognize revenue in a manner that depicts the transfer of goods or services to customers at an amount that reflects the consideration the entity expects in exchange for those goods or services. EQM adopted this standard on January 1, 2018 using the modified retrospective method of adoption. Adoption of the ASU did not require an adjustment to the opening balance of equity. EQM does not expect the standard to have a significant effect on its results of operations, liquidity or financial position. EQM implemented processes and controls to ensure new contracts are reviewed for the appropriate accounting treatment and to generate the disclosures required under the new standard in the first quarter of 2018. For the disclosures required by this ASU, see Note C. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments-Overall: Recognition and Measurement of Financial Assets and Financial Liabilities . The standard primarily affects accounting for equity investments, financial liabilities under the fair value option, the presentation and disclosure requirements for financial instruments and eliminates the cost method of accounting for equity investments. EQM adopted this standard in the first quarter of 2018 with no significant effect on its financial statements or related disclosures. In February 2016, the FASB issued ASU No. 2016-02, Leases . The standard requires an entity to record assets and obligations for contracts currently recognized as operating leases. In July 2018, the FASB also targeted improvements to this ASU in ASU 2018-11. This update provides entities with an optional transition method, which permits an entity to initially apply the new leases standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. EQM has elected to utilize the optional transition method. The ASU will be effective for annual reporting periods beginning after December 15, 2018, including interim periods within that reporting period, with early adoption permitted. EQM is utilizing a lease accounting system to document its current population of contracts classified as leases, which will be updated as EQM's lease population changes. EQM continues to evaluate new business processes and related internal controls and is assessing and documenting the accounting impacts related to the new standard. Although the evaluation is ongoing, EQM expects that the adoption will impact its financial statements as the standard requires recognition on the balance sheet of a right of use asset and corresponding lease liability. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses: Measurement of Credit Losses on Financial Instruments. This ASU amends guidance on reporting credit losses for assets held at amortized cost basis and available for sale debt securities. For assets held at amortized cost basis, this ASU eliminates the probable initial recognition threshold in current GAAP and requires an entity to reflect its current estimate of all expected credit losses. The amendments affect loans, debt securities, trade receivables, net investments in leases, off balance sheet credit exposures, reinsurance receivables, and any other financial assets not excluded from the scope that have the contractual right to receive cash. The ASU will be effective for annual reporting periods beginning after December 15, 2019, including interim periods within that reporting period. EQM is currently evaluating the effect this standard will have on its financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-04, Simplifying the Test of Goodwill Impairment . ASU 2017-04 simplifies the quantitative goodwill impairment test requirements by eliminating the requirement to calculate the implied fair value of goodwill. Instead, a company would record an impairment charge based on the excess of a reporting unit’s carrying value over its fair value. The standard’s provisions are to be applied prospectively. EQM adopted this standard in the first quarter of 2018 with no significant effect on its financial statements or related disclosures. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement, Changes to the Disclosure Requirements for Fair Value Measurement , which makes a number of changes to the hierarchy associated with Level 1, 2 and 3 fair value measurements and the related disclosure requirements. This guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. EQM is currently evaluating the effect this standard will have on its financial statements and related disclosures but does not expect the adoption of this standard to have a material impact on its financial statements and related disclosures.

Acquisitions and Merger

Acquisitions and Merger	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
Acquisitions and Merger	Acquisitions and Merger May 2018 Acquisition On April 25, 2018, EQT, Rice Midstream Holdings LLC, a wholly owned subsidiary of EQT, EQM and EQM Gathering Holdings, LLC (EQM Gathering), a wholly owned subsidiary of EQM, entered into a Contribution and Sale Agreement pursuant to which EQM Gathering acquired from EQT all of EQT's interests in ROM, Strike Force and Rice WV in exchange for an aggregate of 5,889,282 EQM common units and aggregate cash consideration of $1.15 billion , plus working capital adjustments. ROM owns a natural gas gathering system that gathers gas from wells located primarily in Belmont County, Ohio. Strike Force owns a 75% limited liability company interest in Strike Force Midstream LLC (Strike Force Midstream). The May 2018 Acquisition closed on May 22, 2018 with an effective date of May 1, 2018 . EQM-RMP Merger On April 25, 2018, EQM entered into an Agreement and Plan of Merger (the Merger Agreement) with RMP, Rice Midstream Management LLC, the general partner of RMP (the RMP General Partner), the EQM General Partner, EQM Acquisition Sub, LLC, a wholly owned subsidiary of EQM (Merger Sub), EQM GP Acquisition Sub, LLC, a wholly owned subsidiary of EQM (GP Merger Sub), and, solely for certain limited purposes set forth therein, EQT. Pursuant to the Merger Agreement, on July 23, 2018, Merger Sub and GP Merger Sub merged with and into RMP and the RMP General Partner, respectively, with RMP and the RMP General Partner surviving as wholly owned subsidiaries of EQM. Pursuant to the Merger Agreement, each RMP common unit issued and outstanding immediately prior to the effective time of the EQM-RMP Merger was converted into the right to receive 0.3319 EQM common units (the Merger Consideration), the issued and outstanding IDRs of RMP were canceled and each outstanding award of phantom units in respect of RMP common units fully vested and converted into the right to receive the Merger Consideration, less applicable tax withholding, in respect of each RMP common unit subject thereto. The aggregate Merger Consideration consisted of approximately 34 million EQM common units of which 9,544,530 EQM common units were received by an indirect wholly owned subsidiary of EQT. As a result of the EQM-RMP Merger , RMP's common units are no longer publicly traded. As a result of the recast, EQM recognized approximately $1,384.9 million of goodwill. The goodwill value was based on a valuation performed by EQT as of November 13, 2017 with regard to the Rice Merger. EQT recorded goodwill as the excess of the estimated enterprise value of RMP, ROM, Strike Force and Rice WV over the sum of the fair value amounts allocated to the assets and liabilities of RMP, ROM, Strike Force and Rice WV. Goodwill was attributed to additional growth opportunities, synergies and operating leverage within the Gathering segment. Prior to the recast, EQM had no goodwill. The following table summarizes the allocation of the fair value of the assets and liabilities of RMP, ROM, Strike Force and Rice WV as of November 13, 2017 through pushdown accounting from EQT. The preliminary allocation to certain assets and/or liabilities may be adjusted by material amounts as EQT continues to finalize the fair value estimates. At November 13, 2017 (Thousands) Estimated fair value of RMP, ROM, Strike Force and Rice WV (1) $ 4,014,984 Estimated Fair Value of Assets Acquired and Liabilities Assumed: Current assets (2) 132,459 Intangible assets (3) 623,200 Property and equipment, net (4) 2,265,900 Other non-current assets 118 Current liabilities (2) (116,242 ) RMP $850 Million Facility (5) (266,000 ) Other non-current liabilities (5) (9,323 ) Total estimated fair value of assets acquired and liabilities assumed 2,630,112 Goodwill $ 1,384,872 (1) Includes the estimated fair value attributable to noncontrolling interest of $166 million . (2) The fair value of current assets and current liabilities were assumed to approximate their carrying values. (3) The identifiable intangible assets for customer relationships were estimated by applying a discounted cash flow approach which was adjusted for customer attrition assumptions and projected market conditions. (4) The estimated fair value of long-lived property and equipment were determined utilizing estimated replacement cost adjusted for a usage or obsolescence factor. (5) The estimated fair value of long-term liabilities was determined utilizing observable market inputs where available or estimated based on their then current carrying values. As a result of the recast, EQM also recognized approximately $623.2 million in intangible assets. These intangible assets were valued by EQT based upon the estimated fair value of the customer contracts as of November 13, 2017. The customer contracts were assigned a useful life of 15 years and are amortized on a straight-line basis. Amortization expense for the three and nine months ended September 30, 2018 was $10.4 million and $31.2 million , respectively. As of September 30, 2018 and December 31, 2017, accumulated amortization was $36.7 million and $5.5 million , respectively. There was no amortization expense recognized for the three and nine months ended September 30, 2017 . The estimated annual amortization expense over the next five years is $41.5 million . As a result of the recast, EQM recognized a liability for AROs related to dismantling, reclaiming and disposing of the water services assets. Based on an estimate of the timing and amount of their settlement, EQM recorded a liability and capitalized a corresponding amount to asset retirement costs. The liability was estimated using the present value of expected future cash flows, adjusted for inflation and discounted at EQM's credit-adjusted, risk-free rate. The current portion of the AROs was recorded in regulatory and other long-term liabilities on the consolidated balance sheets. The following table presents a reconciliation of the AROs for the periods from November 13, 2017 through September 30, 2018. Asset Retirement Obligations (Thousands) Balance at November 13, 2017 $ 9,286 Accretion expense 35 Balance at December 31, 2017 $ 9,321 Accretion expense 321 Balance at September 30, 2018 $ 9,642 Gulfport Transaction On May 1, 2018, pursuant to the Purchase and Sale Agreement dated April 25, 2018, by and among EQM, EQM Gathering, Gulfport Energy Corporation (Gulfport) and an affiliate of Gulfport, EQM Gathering acquired the remaining 25% limited liability company interest in Strike Force Midstream not owned by Strike Force for $175 million (the Gulfport Transaction). As a result, EQM owned 100% of Strike Force Midstream effective as of May 1, 2018.

Revenue from Contracts with Cus

Revenue from Contracts with Customers	9 Months Ended
	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenue from Contracts with Customers	Revenue from Contracts with Customers As discussed in Note A, EQM adopted ASU No. 2014-09, Revenue from Contracts with Customers , on January 1, 2018 using the modified retrospective method of adoption. EQM applied the standard to all open contracts as of the date of initial application. Adoption of the standard did not require an adjustment to the opening balance of equity and did not materially change EQM's amount or timing of revenues. For the three and nine months ended September 30, 2018 and 2017 , all revenues recognized on EQM's statements of consolidated operations are from contracts with customers. As of September 30, 2018 and December 31, 2017 , all receivables recorded on EQM's consolidated balance sheets represent performance obligations that have been satisfied and for which an unconditional right to consideration exists. Gathering, Transmission and Storage Service Contracts. EQM provides gathering, transmission and storage services in two manners: firm service and interruptible service. Firm service contracts are typically long-term and include firm reservation fees, which are fixed, monthly charges for the guaranteed reservation of pipeline or storage capacity. Volumetric-based fees can also be charged under firm contracts for each firm volume actually transported, gathered or stored as well as for volumes transported, gathered or stored in excess of the firm contracted volume. Interruptible service contracts include volumetric-based fees, which are charges for the volume of gas gathered, transported or stored and generally do not guarantee access to the pipeline or storage facility. These contracts can be short or long-term. Firm and interruptible contracts are billed at the end of each calendar month, with payment typically due within 21 days. Under a firm contract, EQM has a stand-ready obligation to provide the service over the life of the contract. The performance obligation for firm reservation fee revenue is satisfied over time as the pipeline capacity is made available to the customer. As such, EQM recognizes firm reservation fee revenue evenly over the contract period, using a time-elapsed output method to measure progress. The performance obligation for volumetric-based fee revenue is generally satisfied upon EQM's monthly billing to the customer for volumes gathered, transported or stored during the month. The amount billed corresponds directly to the value of EQM's performance to date as the customer obtains value as each volume is gathered, transported or stored. Certain of EQM's gas gathering agreements are structured with minimum volume commitments (MVCs), which specify minimum quantities for which a customer will be charged regardless of quantities gathered under the contract. Revenue is recognized for MVCs when the performance obligation has been met, which is the earlier of when the gas is gathered or when it is remote that the producer will be able to meet its MVC. Water Service Contracts. EQM's water service revenues represent fees charged by EQM for the delivery of fresh water to a customer at a specified delivery point and for the collection and recycling or disposal of flowback and produced water. All of EQM’s water service revenues are generated pursuant to variable price per volume contracts with customers. For fresh water service contracts, the only performance obligation in each contract is for EQM to provide water (usually a minimum daily volume of water) to the customer at a designated delivery point. For flowback and produced water, the performance obligation is collection and disposition of the water which typically occur within the same day. For all water service arrangements, the customer is typically invoiced on a monthly basis with payment due 21 days after the receipt of the invoice. Summary of Disaggregated Revenues. The tables below provide disaggregated revenue information by EQM business segment. Three Months Ended September 30, 2018 Gathering Transmission Water Total (Thousands) Firm reservation fee revenues $ 112,598 $ 82,669 $ — $ 195,267 Volumetric based fee revenues: Usage fees under firm contracts (1) 8,661 5,331 — 13,992 Usage fees under interruptible contracts (2) 131,602 1,350 — 132,952 Total volumetric based fee revenues 140,263 6,681 — 146,944 Water service revenues — — 22,373 22,373 Total operating revenues $ 252,861 $ 89,350 $ 22,373 $ 364,584 Nine Months Ended September 30, 2018 Gathering Transmission Water Total (Thousands) Firm reservation fee revenues $ 334,233 $ 262,666 $ — $ 596,899 Volumetric based fee revenues: Usage fees under firm contracts (1) 30,725 13,981 — 44,706 Usage fees under interruptible contracts (2) 366,482 8,782 — 375,264 Total volumetric based fee revenues 397,207 22,763 — 419,970 Water service revenues — — 93,438 93,438 Total operating revenues $ 731,440 $ 285,429 $ 93,438 $ 1,110,307 (1) Includes fees on volumes gathered and transported in excess of firm contracted capacity as well as usage fees and fees on all volumes transported under firm contracts. (2) Includes volumes from contracts under which EQM has agreed to hold capacity available without charging a capacity reservation fee. Summary of Remaining Performance Obligations. The following table summarizes the transaction price allocated to EQM's remaining performance obligations under all contracts with firm reservation fees and MVCs as of September 30, 2018 . 2018 (1) 2019 2020 2021 2022 Thereafter Total (Thousands) Gathering firm reservation fees $ 113,018 $ 476,270 $ 552,197 $ 562,196 $ 562,196 $ 2,834,111 $ 5,099,988 Gathering revenues supported by MVCs — 65,700 71,370 71,175 71,175 136,875 416,295 Transmission firm reservation fees 94,077 346,893 344,328 339,588 334,522 2,477,808 3,937,216 Total $ 207,095 $ 888,863 $ 967,895 $ 972,959 $ 967,893 $ 5,448,794 $ 9,453,499 (1) October 1 through December 31 Based on total projected contractual revenues, including projected contractual revenues from additional pipeline capacity that will result from expansion projects that are not yet fully constructed, EQM's firm gathering contracts and firm transmission and storage contracts had weighted average remaining terms of approximately 8 and 15 years, respectively, as of December 31, 2017 .

Equity and Net Income per Limit

Equity and Net Income per Limited Partner Unit	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Equity and Net Income per Limited Partner Unit	Equity and Net Income per Limited Partner Unit The following table summarizes EQM's limited partner common units and general partner units issued from January 1, 2018 through September 30, 2018 . There were no issuances in 2017 . Limited Partner Common Units General Partner Units Total Balance at January 1, 2018 80,581,758 1,443,015 82,024,773 Common units issued (1) 9,608 — 9,608 May 2018 Acquisition consideration 5,889,282 — 5,889,282 Common units issued with the EQM-RMP Merger 33,975,777 — 33,975,777 Balance at September 30, 2018 120,456,425 1,443,015 121,899,440 (1) Units issued upon a resignation from the EQM General Partner's Board of Directors in February 2018. As of September 30, 2018 , EQGP owned 21,811,643 EQM common units, representing a 17.9% limited partner interest, 1,443,015 EQM general partner units, representing a 1.2% general partner interest, and all of the IDRs in EQM. As of September 30, 2018 , EQT owned 15,433,812 EQM common units, representing a 12.7% limited partner interest in EQM, 100% of the non-economic general partner interest in EQGP and a 91.3% limited partner interest in EQGP. Net Income per Limited Partner Unit. Net income attributable to the May 2018 Acquisition and the EQM-RMP Merger for the periods prior to May 1, 2018 and July 23, 2018, respectively, was not allocated to the limited partners for purposes of calculating net income per limited partner unit as these pre-acquisition amounts were not available to the EQM unitholders. The weighted average phantom unit awards included in the calculation of basic weighted average limited partner units outstanding was 17,816 and 21,298 for the three months ended September 30, 2018 and 2017 , respectively, and 19,699 and 20,757 for the nine months ended September 30, 2018 and 2017 , respectively. Distributions EQM Distributions. On October 23, 2018 , the Board of Directors of the EQM General Partner declared a cash distribution to EQM's unitholders for the third quarter of 2018 of $1.115 per common unit. The cash distribution will be paid on November 14, 2018 to unitholders of record at the close of business on November 2, 2018 . Based on the EQM common units outstanding on October 25, 2018 , cash distributions to EQGP will be approximately $24.3 million related to its limited partner interest, $2.5 million related to its general partner interest and $71.0 million related to its IDRs in EQM. The distribution amounts to EQGP related to its general partner interest and IDRs in EQM are subject to change if EQM issues additional common units on or prior to the record date for the third quarter 2018 distribution. RMP Distributions. Prior to the EQM-RMP Merger, the RMP partnership agreement required RMP to distribute all of its available cash (as defined in the RMP partnership agreement) to RMP unitholders within 45 days of the end of each quarter. Following the completion of the EQM-RMP Merger, RMP ceased to exist as a separate publicly traded entity and any future available cash will be subject to cash distributions under the EQM partnership agreement.

Financial Information by Busine

Financial Information by Business Segment	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Financial Information by Business Segment	Financial Information by Business Segment Prior to the EQM-RMP Merger , all of EQM's operating activities were conducted through two business segments: Gathering and Transmission. Following the EQM-RMP Merger , EQM adjusted its internal reporting structure to incorporate the newly acquired assets consistent with how EQM's chief operating decision maker reviews its business operations. EQM now conducts its business through three business segments: Gathering, Transmission and Water. Gathering primarily includes high pressure gathering lines and the FERC-regulated low pressure gathering system. Transmission includes EQM's FERC-regulated interstate pipeline and storage business. Water includes water pipelines, impoundment facilities, pumping stations, take point facilities and measurement facilities. EQM has recast the corresponding segment information for the period in which RMP was under the common control of EQT, which began on November 13, 2017. Three Months Ended Nine Months Ended 2018 2017 2018 2017 (Thousands) Revenues from external customers (including affiliates): Gathering $ 252,861 $ 116,522 $ 731,440 $ 330,996 Transmission 89,350 89,771 285,429 272,184 Water 22,373 — 93,438 — Total operating revenues $ 364,584 $ 206,293 $ 1,110,307 $ 603,180 Operating income (loss): Gathering $ 177,902 $ 85,932 $ 510,755 $ 243,061 Transmission 58,691 59,770 198,784 189,237 Water (3,093 ) — 35,627 — Total operating income $ 233,500 $ 145,702 $ 745,166 $ 432,298 Reconciliation of operating income to net income: Equity income (1) 16,087 6,025 35,836 15,413 Other income 1,345 637 3,193 3,576 Net interest expense 41,005 9,426 76,740 26,014 Net income $ 209,927 $ 142,938 $ 707,455 $ 425,273 (1) Equity income is included in the Transmission segment. September 30, December 31, (Thousands) Segment assets: Gathering $ 6,131,380 $ 5,656,094 Transmission (1) 2,833,519 1,947,566 Water 177,126 208,273 Total operating segments 9,142,025 7,811,933 Headquarters, including cash 124,166 186,902 Total assets $ 9,266,191 $ 7,998,835 (1) The equity investment in the MVP Joint Venture was included in the headquarters segment prior to June 30, 2018. As of June 30, 2018, the investment in the MVP Joint Venture was included in the Transmission segment and the amount at December 31, 2017 has been recast to conform with this presentation. Three Months Ended Nine Months Ended 2018 2017 2018 2017 (Thousands) Depreciation: Gathering $ 25,359 $ 9,983 $ 72,309 $ 28,398 Transmission 12,357 12,261 37,228 35,793 Water 5,851 — 17,420 — Total $ 43,567 $ 22,244 $ 126,957 $ 64,191 Expenditures for segment assets: Gathering $ 194,477 $ 48,182 $ 515,072 $ 150,728 Transmission 37,626 22,312 84,517 73,679 Water 7,981 — 17,358 — Total (1) $ 240,084 $ 70,494 $ 616,947 $ 224,407 (1) EQM accrues capital expenditures when work has been completed but the associated bills have not yet been paid. These accrued amounts are excluded from capital expenditures in the statements of consolidated cash flows until they are paid in a subsequent period. Accrued capital expenditures were approximately $91.3 million , $84.6 million and $90.7 million at September 30, 2018 , June 30, 2018 and December 31, 2017 , respectively. Accrued capital expenditures were approximately $26.5 million , $31.2 million and $26.7 million at September 30, 2017 , June 30, 2017 and December 31, 2016 , respectively.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions In the ordinary course of business, EQM engages in transactions with EQT and its affiliates including, but not limited to, gas gathering agreements, transportation service and precedent agreements, storage agreements and water services agreements. Pursuant to an omnibus agreement (the EQM Omnibus Agreement), EQT performs centralized corporate, general and administrative services for EQM. In exchange, EQM reimburses EQT for the expenses incurred by EQT in providing these services. The EQM Omnibus Agreement also provides for certain indemnification obligations between EQM and EQT. Pursuant to a secondment agreement, employees of EQT and its affiliates may be seconded to EQM to provide operating and other services with respect to EQM's business under the direction, supervision and control of EQM. EQM reimburses EQT and its affiliates for the services provided by the seconded employees. The expenses for which EQM reimburses EQT and its affiliates may not necessarily reflect the actual expenses that EQM would incur on a stand-alone basis. EQM is unable to estimate what those expenses would be on a stand-alone basis. In connection with the completion of the Rice Merger, RMP, EQT and other affiliates entered into an amended and restated omnibus agreement (the Amended RMP Omnibus Agreement). Pursuant to the Amended RMP Omnibus Agreement, EQT performed centralized corporate general and administrative services for RMP. In exchange, RMP reimbursed EQT for the expenses incurred by EQT in providing these services. Following the completion of the EQM-RMP Merger, RMP reimburses EQT for the expenses incurred by EQT providing services to RMP and its subsidiaries under the EQM Omnibus Agreement. The Amended RMP Omnibus Agreement continues in existence for purposes of certain indemnification obligations that survived the merger.

Investment in Unconsolidated En

Investment in Unconsolidated Entity	9 Months Ended
	Sep. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]
Investment in Unconsolidated Entity	Investment in Unconsolidated Entity The MVP Joint Venture is constructing the Mountain Valley Pipeline (MVP), an estimated 300 -mile natural gas interstate pipeline spanning from northern West Virginia to southern Virginia. EQM is the operator of the MVP and owned a 45.5% interest in the MVP Joint Venture as of September 30, 2018 . The MVP Joint Venture is a variable interest entity because it has insufficient equity to finance its activities during the construction stage of the project. EQM is not the primary beneficiary because it does not have the power to direct the activities of the MVP Joint Venture that most significantly impact its economic performance. Certain business decisions require the approval of owners holding more than a 66 2/3% interest in the MVP Joint Venture and no one member owns more than a 66 2/3% interest. The MVP Joint Venture is an equity method investment for accounting purposes as EQM has the ability to exercise significant influence over operating and financial policies of the MVP Joint Venture. In April 2018, the MVP Joint Venture announced the MVP Southgate project, a proposed 70 -mile interstate pipeline that will extend from the MVP at Pittsylvania County, Virginia to new delivery points in Rockingham and Alamance Counties, North Carolina. As of September 30, 2018 , EQM had a 32.7% ownership interest in the MVP Southgate project and will operate the pipeline. In September 2018 , the MVP Joint Venture issued a capital call notice to MVP Holdco, LLC (MVP Holdco), a direct wholly owned subsidiary of EQM, for $456.0 million , of which $175.2 million was paid as of October 2018 , and $280.8 million is expected to be paid in the fourth quarter of 2018. In addition, in September 2018, the MVP Joint Venture issued a capital call notice to MVP Holdco for $7.7 million for funding of the MVP Southgate project that is expected to be paid in the fourth quarter of 2018. The capital contribution payables have been reflected on the consolidated balance sheet as of September 30, 2018 with corresponding increases to EQM's investment in the MVP Joint Venture. Equity income is EQM's portion of the MVP Joint Venture's AFUDC on construction of the MVP. As of September 30, 2018 , EQM had issued a $91 million performance guarantee in favor of the MVP Joint Venture. The guarantee provides performance assurances of MVP Holdco's obligations to fund its proportionate share of the MVP construction budget. As of September 30, 2018 , EQM's maximum financial statement exposure related to the MVP Joint Venture was approximately $1,391 million , which consists of the investment in unconsolidated entity balance on the consolidated balance sheet as of September 30, 2018 and amounts that could have become due under EQM's performance guarantee as of that date. The following tables summarize the unaudited condensed financial statements for the MVP Joint Venture. Condensed Consolidated Balance Sheets September 30, December 31, (Thousands) Current assets $ 1,260,789 $ 330,271 Noncurrent assets 2,330,467 747,728 Total assets $ 3,591,256 $ 1,077,999 Current liabilities $ 726,528 $ 65,811 Equity 2,864,728 1,012,188 Total liabilities and equity $ 3,591,256 $ 1,077,999 Condensed Statements of Consolidated Operations Three Months Ended Nine Months Ended 2018 2017 2018 2017 (Thousands) Net interest income $ 11,958 $ 3,227 $ 25,873 $ 8,205 AFUDC - equity 23,417 10,055 52,906 25,710 Net income $ 35,375 $ 13,282 $ 78,779 $ 33,915

Debt

Debt	9 Months Ended
	Sep. 30, 2018
Long-term Debt, Current and Noncurrent [Abstract]
Debt	Debt $1 Billion Facility. EQM has a $1 billion credit facility that expires in July 2022. The $1 Billion Facility is available to fund working capital requirements and capital expenditures, to purchase assets, to pay distributions and repurchase units and for general partnership purposes (including purchasing assets from EQT and other third parties). EQM's $1 Billion Facility contains various provisions that, if violated, could result in termination of the credit facility, require early payment of amounts outstanding or similar actions. The most significant covenants and events of default relate to maintenance of a permitted leverage ratio, limitations on transactions with affiliates, limitations on restricted payments, insolvency events, nonpayment of scheduled principal or interest payments, acceleration of and certain other defaults under other financial obligations and change of control provisions. Under the $1 Billion Facility, EQM is required to maintain a consolidated leverage ratio of not more than 5.00 to 1.00 (or not more than 5.50 to 1.00 for certain measurement periods following the consummation of certain acquisitions). EQM had $22 million in borrowings and $1 million of letters of credit outstanding under its credit facility as of September 30, 2018 . EQM had $180 million in borrowings and no letters of credit outstanding under its credit facility as of December 31, 2017 . During the three and nine months ended September 30, 2018 , the maximum amount of EQM's outstanding borrowings under the credit facility at any time was $74 million and $420 million , respectively, and the average daily balance was approximately $22 million and $147 million , respectively. EQM incurred interest at weighted average annual interest rates of approximately 3.7% and 3.2% for the three and nine months ended September 30, 2018 , respectively. During the three and nine months ended September 30, 2017 , the maximum amount of EQM's outstanding borrowings under the credit facility at any time was $177 million and the average daily balances were approximately $95 million and $32 million , respectively. Interest was incurred at a weighted average annual interest rate of approximately 2.7% for the three and nine months ended September 30, 2017 . Prior to the proposed separation of EQT's production and midstream businesses (the Separation), EQM intends to increase its borrowing capacity from $1 billion up to $3 billion . 364 -Day Facility. EQM has a $500 million , 364 -day, uncommitted revolving loan agreement with EQT. Interest accrues on outstanding borrowings at an interest rate equal to the rate then applicable to similar loans under the $1 Billion Facility, or a successor revolving credit facility, less the sum of (i) the then applicable commitment fee under the $1 Billion Facility and (ii) 10 basis points. EQM had no borrowings outstanding on the 364 -Day Facility as of September 30, 2018 and December 31, 2017 . There were no borrowings outstanding at any time during the three and nine months ended September 30, 2018 . During the three and nine months ended September 30, 2017 , the maximum amount of EQM's outstanding borrowings under the credit facility at any time was $40 million and $100 million , respectively, and the average daily balances were approximately $11 million and $30 million , respectively. EQM incurred interest at weighted average annual interest rates of approximately 2.4% and 2.2% for the three and nine months ended September 30, 2017 , respectively. EQM expects EQT to terminate the 364 -Day Facility at or prior to the Separation. EQM Term Loan Facility . On April 25, 2018, EQM entered into a $2.5 billion unsecured multi-draw 364 -day term loan facility with a syndicate of lenders. The EQM Term Loan Facility was used to fund the cash consideration for the May 2018 Acquisition , to repay borrowings under EQM's $1 Billion Facility and for other general partnership purposes. During the second quarter 2018, the balance outstanding under the EQM Term Loan Facility was repaid, and the EQM Term Loan Facility was terminated on June 25, 2018 in connection with EQM's issuance of the 2018 Senior Notes (defined below). As a result of the termination, EQM expensed $3 million of deferred issuance costs. From April 25, 2018 through June 25, 2018 , the maximum amount of EQM's outstanding borrowings under the EQM Term Loan Facility at any time was $1,825 million and the average daily balance was approximately $1,231 million . EQM incurred interest at a weighted average annual interest rate of approximately 3.3% for the period from April 25, 2018 through June 25, 2018 . RMP $850 Million Facility. RM Operating LLC (formerly known as R ice Midstream OpCo LLC) (Rice Midstream OpCo), a wholly owned subsidiary of RMP, had an $850 million credit facility. The RMP $850 Million Facility was available for general partnership purposes, including to purchase assets, and to fund working capital requirements and capital expenditures, pay dividends and repurchase units. The RMP $850 Million Facility was secured by mortgages and other security interests on substantially all of RMP's properties and was guaranteed by RMP and its restricted subsidiaries. As of December 31, 2017, Rice Midstream OpCo had $286 million of borrowings and $1 million of letters of credit outstanding under the RMP $850 Million Facility . For the periods from July 1, 2018 through July 23, 2018 and from January 1, 2018 through July 23, 2018, the maximum amounts of RMP's outstanding borrowings under the RMP $850 Million Facility at any time were $260 million and $375 million , respectively, and the average daily outstanding balances under the RMP $850 Million Facility were approximately $249 million and $300 million , respectively. Interest was incurred on the RMP $850 Million Facility at weighted average annual interest rates of 4.1% and 3.8% for the periods from July 1, 2018 through July 23, 2018 and from January 1, 2018 through July 23, 2018, respectively. In connection with the completion of the EQM-RMP Merger, on July 23, 2018, EQM repaid the approximately $260 million of borrowings outstanding under the RMP $850 Million Facility and the RMP $850 Million Facility was terminated. 2018 Senior Notes. During the second quarter of 2018, EQM issued 4.75% senior notes due July 15, 2023 in the aggregate principal amount of $1.1 billion , 5.50% senior notes due July 15, 2028 in the aggregate principal amount of $850 million and 6.50% senior notes due July 15, 2048 in the aggregate principal amount of $550 million (collectively, the 2018 Senior Notes). EQM received net proceeds from the offering of approximately $2,465.8 million , inclusive of a discount of $11.8 million and estimated debt issuance costs of $22.4 million . The net proceeds were used to repay the balances outstanding under the EQM Term Loan Facility and the RMP $850 Million Facility, and the remainder is expected to be used for general partnership purposes. The 2018 Senior Notes were issued pursuant to new supplemental indentures to EQM's existing indenture dated August 1, 2014. The 2018 Senior Notes contain covenants that limit EQM's ability to, among other things, incur certain liens securing indebtedness, engage in certain sale and leaseback transactions, and enter into certain consolidations, mergers, conveyances, transfers or leases of all or substantially all of the EQM's assets. As of September 30, 2018 , EQM was in compliance with all debt provisions and covenants.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The carrying values of cash and cash equivalents, accounts receivable, amounts due to/from related parties and accounts payable approximate fair value due to the short maturity of the instruments; these are considered Level 1 fair value measurements. The carrying value of the credit facility borrowings approximates fair value as the interest rates are based on prevailing market rates; this is considered a Level 1 fair value measurement. As EQM's senior notes are not actively traded, their fair values are considered Level 2 fair value measurements and are estimated using a standard industry income approach model that applies a discount rate based on market rates for debt with similar remaining time to maturity and credit risk. As of September 30, 2018 and December 31, 2017 , the estimated fair value of EQM's senior notes was approximately $3,532 million and $1,006 million , respectively, and the carrying value of EQM's senior notes was approximately $3,455 million and $987 million , respectively. The fair value of the Preferred Interest is a Level 3 fair value measurement and is estimated using an income approach model that applies a market-based discount rate. As of September 30, 2018 and December 31, 2017 , the estimated fair value of the Preferred Interest was approximately $122 million and $133 million , respectively, and the carrying value of the Preferred Interest was approximately $116 million and $119 million , respectively.

Distributions

Distributions	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Distributions	Equity and Net Income per Limited Partner Unit The following table summarizes EQM's limited partner common units and general partner units issued from January 1, 2018 through September 30, 2018 . There were no issuances in 2017 . Limited Partner Common Units General Partner Units Total Balance at January 1, 2018 80,581,758 1,443,015 82,024,773 Common units issued (1) 9,608 — 9,608 May 2018 Acquisition consideration 5,889,282 — 5,889,282 Common units issued with the EQM-RMP Merger 33,975,777 — 33,975,777 Balance at September 30, 2018 120,456,425 1,443,015 121,899,440 (1) Units issued upon a resignation from the EQM General Partner's Board of Directors in February 2018. As of September 30, 2018 , EQGP owned 21,811,643 EQM common units, representing a 17.9% limited partner interest, 1,443,015 EQM general partner units, representing a 1.2% general partner interest, and all of the IDRs in EQM. As of September 30, 2018 , EQT owned 15,433,812 EQM common units, representing a 12.7% limited partner interest in EQM, 100% of the non-economic general partner interest in EQGP and a 91.3% limited partner interest in EQGP. Net Income per Limited Partner Unit. Net income attributable to the May 2018 Acquisition and the EQM-RMP Merger for the periods prior to May 1, 2018 and July 23, 2018, respectively, was not allocated to the limited partners for purposes of calculating net income per limited partner unit as these pre-acquisition amounts were not available to the EQM unitholders. The weighted average phantom unit awards included in the calculation of basic weighted average limited partner units outstanding was 17,816 and 21,298 for the three months ended September 30, 2018 and 2017 , respectively, and 19,699 and 20,757 for the nine months ended September 30, 2018 and 2017 , respectively. Distributions EQM Distributions. On October 23, 2018 , the Board of Directors of the EQM General Partner declared a cash distribution to EQM's unitholders for the third quarter of 2018 of $1.115 per common unit. The cash distribution will be paid on November 14, 2018 to unitholders of record at the close of business on November 2, 2018 . Based on the EQM common units outstanding on October 25, 2018 , cash distributions to EQGP will be approximately $24.3 million related to its limited partner interest, $2.5 million related to its general partner interest and $71.0 million related to its IDRs in EQM. The distribution amounts to EQGP related to its general partner interest and IDRs in EQM are subject to change if EQM issues additional common units on or prior to the record date for the third quarter 2018 distribution. RMP Distributions. Prior to the EQM-RMP Merger, the RMP partnership agreement required RMP to distribute all of its available cash (as defined in the RMP partnership agreement) to RMP unitholders within 45 days of the end of each quarter. Following the completion of the EQM-RMP Merger, RMP ceased to exist as a separate publicly traded entity and any future available cash will be subject to cash distributions under the EQM partnership agreement.

Financial Statements (Policies)

Financial Statements (Policies)	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Basis of Presentation	The accompanying unaudited consolidated financial statements have been prepared in accordance with 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 Form 10-Q) necessary for a fair presentation of the financial position of EQM as of September 30, 2018 and December 31, 2017 , the results of its operations for the three and nine months ended September 30, 2018 and 2017 , and its cash flows and equity for the nine months ended September 30, 2018 and 2017 . Certain previously reported amounts have been reclassified to conform to the current year presentation. The balance sheet at December 31, 2017 has been derived from the audited financial statements at that date but does not include all of the information and footnotes required by GAAP for complete financial statements. EQM's consolidated financial statements have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control. The recast is for the period the acquired businesses were under the common control of EQT, which began on November 13, 2017 as a result of EQT's merger with Rice Energy Inc. (Rice) (the Rice Merger). EQM recorded the assets and liabilities acquired in the May 2018 Acquisition and the EQM-RMP Merger at their carrying amounts to EQT on the effective dates of the transactions. The consolidated financial statements are not necessarily indicative of the actual results of operations if EQM and the assets acquired in the May 2018 Acquisition and the EQM-RMP Merger had been operated together during the pre-acquisition periods. Due to the seasonal nature of EQM's utility customer contracts, the interim statements for the three and nine months ended September 30, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018 . For further information, refer to the consolidated financial statements and related footnotes for the year ended December 31, 2017 and "Management's Discussion and Analysis of Financial Condition and Results of Operations," in each case as included in EQM's Current Report on Form 8-K as filed with the SEC on June 12, 2018.
Recently Issued Accounting Standards	Recently Issued Accounting Standards In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers . The standard requires an entity to recognize revenue in a manner that depicts the transfer of goods or services to customers at an amount that reflects the consideration the entity expects in exchange for those goods or services. EQM adopted this standard on January 1, 2018 using the modified retrospective method of adoption. Adoption of the ASU did not require an adjustment to the opening balance of equity. EQM does not expect the standard to have a significant effect on its results of operations, liquidity or financial position. EQM implemented processes and controls to ensure new contracts are reviewed for the appropriate accounting treatment and to generate the disclosures required under the new standard in the first quarter of 2018. For the disclosures required by this ASU, see Note C. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments-Overall: Recognition and Measurement of Financial Assets and Financial Liabilities . The standard primarily affects accounting for equity investments, financial liabilities under the fair value option, the presentation and disclosure requirements for financial instruments and eliminates the cost method of accounting for equity investments. EQM adopted this standard in the first quarter of 2018 with no significant effect on its financial statements or related disclosures. In February 2016, the FASB issued ASU No. 2016-02, Leases . The standard requires an entity to record assets and obligations for contracts currently recognized as operating leases. In July 2018, the FASB also targeted improvements to this ASU in ASU 2018-11. This update provides entities with an optional transition method, which permits an entity to initially apply the new leases standard at the adoption date and recognize a cumulative-effect adjustment to the opening balance of retained earnings in the period of adoption. EQM has elected to utilize the optional transition method. The ASU will be effective for annual reporting periods beginning after December 15, 2018, including interim periods within that reporting period, with early adoption permitted. EQM is utilizing a lease accounting system to document its current population of contracts classified as leases, which will be updated as EQM's lease population changes. EQM continues to evaluate new business processes and related internal controls and is assessing and documenting the accounting impacts related to the new standard. Although the evaluation is ongoing, EQM expects that the adoption will impact its financial statements as the standard requires recognition on the balance sheet of a right of use asset and corresponding lease liability. In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses: Measurement of Credit Losses on Financial Instruments. This ASU amends guidance on reporting credit losses for assets held at amortized cost basis and available for sale debt securities. For assets held at amortized cost basis, this ASU eliminates the probable initial recognition threshold in current GAAP and requires an entity to reflect its current estimate of all expected credit losses. The amendments affect loans, debt securities, trade receivables, net investments in leases, off balance sheet credit exposures, reinsurance receivables, and any other financial assets not excluded from the scope that have the contractual right to receive cash. The ASU will be effective for annual reporting periods beginning after December 15, 2019, including interim periods within that reporting period. EQM is currently evaluating the effect this standard will have on its financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-04, Simplifying the Test of Goodwill Impairment . ASU 2017-04 simplifies the quantitative goodwill impairment test requirements by eliminating the requirement to calculate the implied fair value of goodwill. Instead, a company would record an impairment charge based on the excess of a reporting unit’s carrying value over its fair value. The standard’s provisions are to be applied prospectively. EQM adopted this standard in the first quarter of 2018 with no significant effect on its financial statements or related disclosures. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement, Changes to the Disclosure Requirements for Fair Value Measurement , which makes a number of changes to the hierarchy associated with Level 1, 2 and 3 fair value measurements and the related disclosure requirements. This guidance is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. Early adoption is permitted. EQM is currently evaluating the effect this standard will have on its financial statements and related disclosures but does not expect the adoption of this standard to have a material impact on its financial statements and related disclosures.

Acquisitions and Merger (Tables

Acquisitions and Merger (Tables)	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
Schedule Fair Value of Assets Acquired and Liabilities Assumed	The following table summarizes the allocation of the fair value of the assets and liabilities of RMP, ROM, Strike Force and Rice WV as of November 13, 2017 through pushdown accounting from EQT. The preliminary allocation to certain assets and/or liabilities may be adjusted by material amounts as EQT continues to finalize the fair value estimates. At November 13, 2017 (Thousands) Estimated fair value of RMP, ROM, Strike Force and Rice WV (1) $ 4,014,984 Estimated Fair Value of Assets Acquired and Liabilities Assumed: Current assets (2) 132,459 Intangible assets (3) 623,200 Property and equipment, net (4) 2,265,900 Other non-current assets 118 Current liabilities (2) (116,242 ) RMP $850 Million Facility (5) (266,000 ) Other non-current liabilities (5) (9,323 ) Total estimated fair value of assets acquired and liabilities assumed 2,630,112 Goodwill $ 1,384,872 (1) Includes the estimated fair value attributable to noncontrolling interest of $166 million . (2) The fair value of current assets and current liabilities were assumed to approximate their carrying values. (3) The identifiable intangible assets for customer relationships were estimated by applying a discounted cash flow approach which was adjusted for customer attrition assumptions and projected market conditions. (4) The estimated fair value of long-lived property and equipment were determined utilizing estimated replacement cost adjusted for a usage or obsolescence factor. (5) The estimated fair value of long-term liabilities was determined utilizing observable market inputs where available or estimated based on their then current carrying values.
Schedule of Change in Asset Retirement Obligation	The following table presents a reconciliation of the AROs for the periods from November 13, 2017 through September 30, 2018. Asset Retirement Obligations (Thousands) Balance at November 13, 2017 $ 9,286 Accretion expense 35 Balance at December 31, 2017 $ 9,321 Accretion expense 321 Balance at September 30, 2018 $ 9,642

Revenue from Contracts with C_2

Revenue from Contracts with Customers (Tables)	9 Months Ended
	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Schedule of Disaggregated Revenue Information, by Business Segment	The tables below provide disaggregated revenue information by EQM business segment. Three Months Ended September 30, 2018 Gathering Transmission Water Total (Thousands) Firm reservation fee revenues $ 112,598 $ 82,669 $ — $ 195,267 Volumetric based fee revenues: Usage fees under firm contracts (1) 8,661 5,331 — 13,992 Usage fees under interruptible contracts (2) 131,602 1,350 — 132,952 Total volumetric based fee revenues 140,263 6,681 — 146,944 Water service revenues — — 22,373 22,373 Total operating revenues $ 252,861 $ 89,350 $ 22,373 $ 364,584 Nine Months Ended September 30, 2018 Gathering Transmission Water Total (Thousands) Firm reservation fee revenues $ 334,233 $ 262,666 $ — $ 596,899 Volumetric based fee revenues: Usage fees under firm contracts (1) 30,725 13,981 — 44,706 Usage fees under interruptible contracts (2) 366,482 8,782 — 375,264 Total volumetric based fee revenues 397,207 22,763 — 419,970 Water service revenues — — 93,438 93,438 Total operating revenues $ 731,440 $ 285,429 $ 93,438 $ 1,110,307 (1) Includes fees on volumes gathered and transported in excess of firm contracted capacity as well as usage fees and fees on all volumes transported under firm contracts. (2) Includes volumes from contracts under which EQM has agreed to hold capacity available without charging a capacity reservation fee.
Summary of Remaining Performance Obligations	The following table summarizes the transaction price allocated to EQM's remaining performance obligations under all contracts with firm reservation fees and MVCs as of September 30, 2018 . 2018 (1) 2019 2020 2021 2022 Thereafter Total (Thousands) Gathering firm reservation fees $ 113,018 $ 476,270 $ 552,197 $ 562,196 $ 562,196 $ 2,834,111 $ 5,099,988 Gathering revenues supported by MVCs — 65,700 71,370 71,175 71,175 136,875 416,295 Transmission firm reservation fees 94,077 346,893 344,328 339,588 334,522 2,477,808 3,937,216 Total $ 207,095 $ 888,863 $ 967,895 $ 972,959 $ 967,893 $ 5,448,794 $ 9,453,499 (1) October 1 through December 31

Equity and Net Income per Lim_2

Equity and Net Income per Limited Partner Unit (Tables)	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Summary of Units Issued	The following table summarizes EQM's limited partner common units and general partner units issued from January 1, 2018 through September 30, 2018 . There were no issuances in 2017 . Limited Partner Common Units General Partner Units Total Balance at January 1, 2018 80,581,758 1,443,015 82,024,773 Common units issued (1) 9,608 — 9,608 May 2018 Acquisition consideration 5,889,282 — 5,889,282 Common units issued with the EQM-RMP Merger 33,975,777 — 33,975,777 Balance at September 30, 2018 120,456,425 1,443,015 121,899,440 (1) Units issued upon a resignation from the EQM General Partner's Board of Directors in February 2018.

Financial Information by Busi_2

Financial Information by Business Segment (Tables)	9 Months Ended
	Sep. 30, 2018
Segment Reporting [Abstract]
Schedule of Revenue from External Customers and Operating Income and Reconciliation to Net Income	Three Months Ended Nine Months Ended 2018 2017 2018 2017 (Thousands) Revenues from external customers (including affiliates): Gathering $ 252,861 $ 116,522 $ 731,440 $ 330,996 Transmission 89,350 89,771 285,429 272,184 Water 22,373 — 93,438 — Total operating revenues $ 364,584 $ 206,293 $ 1,110,307 $ 603,180 Operating income (loss): Gathering $ 177,902 $ 85,932 $ 510,755 $ 243,061 Transmission 58,691 59,770 198,784 189,237 Water (3,093 ) — 35,627 — Total operating income $ 233,500 $ 145,702 $ 745,166 $ 432,298 Reconciliation of operating income to net income: Equity income (1) 16,087 6,025 35,836 15,413 Other income 1,345 637 3,193 3,576 Net interest expense 41,005 9,426 76,740 26,014 Net income $ 209,927 $ 142,938 $ 707,455 $ 425,273 (1) Equity income is included in the Transmission segment.
Schedule of Segment Assets	September 30, December 31, (Thousands) Segment assets: Gathering $ 6,131,380 $ 5,656,094 Transmission (1) 2,833,519 1,947,566 Water 177,126 208,273 Total operating segments 9,142,025 7,811,933 Headquarters, including cash 124,166 186,902 Total assets $ 9,266,191 $ 7,998,835 (1) The equity investment in the MVP Joint Venture was included in the headquarters segment prior to June 30, 2018. As of June 30, 2018, the investment in the MVP Joint Venture was included in the Transmission segment and the amount at December 31, 2017 has been recast to conform with this presentation.
Schedule of Depreciation, Amortization, and Expenditures for Segment Assets	Three Months Ended Nine Months Ended 2018 2017 2018 2017 (Thousands) Depreciation: Gathering $ 25,359 $ 9,983 $ 72,309 $ 28,398 Transmission 12,357 12,261 37,228 35,793 Water 5,851 — 17,420 — Total $ 43,567 $ 22,244 $ 126,957 $ 64,191 Expenditures for segment assets: Gathering $ 194,477 $ 48,182 $ 515,072 $ 150,728 Transmission 37,626 22,312 84,517 73,679 Water 7,981 — 17,358 — Total (1) $ 240,084 $ 70,494 $ 616,947 $ 224,407 (1) EQM accrues capital expenditures when work has been completed but the associated bills have not yet been paid. These accrued amounts are excluded from capital expenditures in the statements of consolidated cash flows until they are paid in a subsequent period. Accrued capital expenditures were approximately $91.3 million , $84.6 million and $90.7 million at September 30, 2018 , June 30, 2018 and December 31, 2017 , respectively. Accrued capital expenditures were approximately $26.5 million , $31.2 million and $26.7 million at September 30, 2017 , June 30, 2017 and December 31, 2016 , respectively.

Investment in Unconsolidated _2

Investment in Unconsolidated Entity (Tables)	9 Months Ended
	Sep. 30, 2018
Equity Method Investments and Joint Ventures [Abstract]
Schedule of Unaudited Condensed Financial Statements for the Investment in Unconsolidated Equity	The following tables summarize the unaudited condensed financial statements for the MVP Joint Venture. Condensed Consolidated Balance Sheets September 30, December 31, (Thousands) Current assets $ 1,260,789 $ 330,271 Noncurrent assets 2,330,467 747,728 Total assets $ 3,591,256 $ 1,077,999 Current liabilities $ 726,528 $ 65,811 Equity 2,864,728 1,012,188 Total liabilities and equity $ 3,591,256 $ 1,077,999 Condensed Statements of Consolidated Operations Three Months Ended Nine Months Ended 2018 2017 2018 2017 (Thousands) Net interest income $ 11,958 $ 3,227 $ 25,873 $ 8,205 AFUDC - equity 23,417 10,055 52,906 25,710 Net income $ 35,375 $ 13,282 $ 78,779 $ 33,915

Acquisitions and Merger - Narra

Acquisitions and Merger - Narrative (Details)

Jul. 23, 2018shares

May 01, 2018USD ($)shares

Apr. 25, 2018shares

Nov. 13, 2017USD ($)

Sep. 30, 2018USD ($)

Sep. 30, 2017USD ($)

Sep. 30, 2018USD ($)

Sep. 30, 2017USD ($)

Dec. 31, 2017USD ($)

Business Acquisition [Line Items]

Goodwill

[1]

$ 1,384,872,000

$ 1,384,872,000

$ 1,384,872,000

Amortization of intangible assets

[2]

10,387,000

$ 0

31,160,000

[3]

$ 0

[3]

Strike Force Midstream

Business Acquisition [Line Items]

Membership interest (as a percent)

100.00%

May 2018 Acquisition

Business Acquisition [Line Items]

Equity interest issued or issuable (in shares) | shares

5,889,282

Payments to acquire businesses, gross

$ 1,150,000,000

Amortization of intangible assets

$ 0

Estimated annual amortization expense, 2019

41,500,000

41,500,000

Estimated annual amortization expense, 2020

41,500,000

41,500,000

Estimated annual amortization expense, 2021

41,500,000

41,500,000

Estimated annual amortization expense, 2022

41,500,000

41,500,000

EQM-RMP Merger

Business Acquisition [Line Items]

Goodwill

$ 1,384,872,000

Intangible assets acquired

$ 623,200,000

Weighted average useful life

15 years

Amortization of intangible assets

10,400,000

$ 0

31,200,000

Accumulated amortization

36,700,000

36,700,000

$ 5,500,000

Estimated annual amortization expense, current

$ 41,500,000

$ 41,500,000

Consideration transferred

$ 4,014,984,000

Strike Force Midstream

Business Acquisition [Line Items]

Percentage of voting interests acquired

25.00%

Consideration transferred

$ 175,000,000

Strike Force Midstream Holdings LLC | May 2018 Acquisition | Strike Force Midstream

Business Acquisition [Line Items]

Membership interest (as a percent)

75.00%

Rice Midstream Partners, LP | EQM-RMP Merger

Business Acquisition [Line Items]

Equity interest issued or issuable (in shares) | shares

34,000,000

Common share conversation ratio

0.3319

EQT | EQM-RMP Merger | EQM

Business Acquisition [Line Items]

Equity interest issued or issuable (in shares) | shares

9,544,530

[1]

As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.

[2]

As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of Rice Olympus Midstream LLC (ROM), Strike Force Midstream Holdings LLC (Strike Force) and Rice West Virginia Midstream LLC (Rice WV), which were acquired by EQM effective on May 1, 2018 (the May 2018 Acquisition), and Rice Midstream Partners LP (RMP), which was acquired by EQM effective on July 23, 2018 (the EQM-RMP Merger), because these transactions were between entities under common control.

[3]

As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.

Acquisitions and Merger - Sched

Acquisitions and Merger - Schedule Fair Value of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands		Nov. 13, 2017	Sep. 30, 2018	Dec. 31, 2017
Estimated Fair Value of Assets Acquired and Liabilities Assumed:
Goodwill	[1]		$ 1,384,872	$ 1,384,872
EQM-RMP Merger
Business Acquisition [Line Items]
Estimated fair value of RMP, ROM, Strike Force and Rice WV		$ 4,014,984
Estimated Fair Value of Assets Acquired and Liabilities Assumed:
Current assets		132,459
Intangible assets		623,200
Property and equipment, net		2,265,900
Property and equipment, net		118
Current liabilities		(116,242)
RMP $850 Million Facility		(266,000)
Other non-current liabilities		(9,323)
Total estimated fair value of assets acquired and liabilities assumed		2,630,112
Goodwill		1,384,872
Estimated fair value of noncontrolling interest		$ 166,000
[1]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.

Acquisitions and Merger - Sch_2

Acquisitions and Merger - Schedule of Change in Asset Retirement Obligation (Details) - USD ($) $ in Thousands	2 Months Ended	9 Months Ended
	Dec. 31, 2017	Sep. 30, 2018
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Balance, beginning of the year	$ 9,286	$ 9,321
Accretion expense	35	321
Balance, end of the year	$ 9,321	$ 9,642

Revenue from Contracts with C_3

Revenue from Contracts with Customers - Narrative (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Contract billing cycle	21 days
Water
Disaggregation of Revenue [Line Items]
Contract billing cycle	21 days
Gathering
Disaggregation of Revenue [Line Items]
Weighted average remaining term		8 years
Transmission
Disaggregation of Revenue [Line Items]
Weighted average remaining term		15 years

Revenue from Contracts with C_4

Revenue from Contracts with Customers - Schedule of Disaggregated Revenue Information, by Business Segment (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Total operating revenues	[1],[2]	$ 364,584	$ 206,293	$ 1,110,307	$ 603,180
Firm reservation fee revenues | Firm reservation fee revenues
Disaggregation of Revenue [Line Items]
Total operating revenues		195,267		596,899
Volumetric based fee revenues
Disaggregation of Revenue [Line Items]
Total operating revenues		146,944		419,970
Volumetric based fee revenues | Usage fees under firm contracts
Disaggregation of Revenue [Line Items]
Total operating revenues		13,992		44,706
Volumetric based fee revenues | Usage fees under interruptible contracts
Disaggregation of Revenue [Line Items]
Total operating revenues		132,952		375,264
Gathering
Disaggregation of Revenue [Line Items]
Total operating revenues		252,861		731,440
Gathering | Firm reservation fee revenues | Firm reservation fee revenues
Disaggregation of Revenue [Line Items]
Total operating revenues		112,598		334,233
Gathering | Volumetric based fee revenues
Disaggregation of Revenue [Line Items]
Total operating revenues		140,263		397,207
Gathering | Volumetric based fee revenues | Usage fees under firm contracts
Disaggregation of Revenue [Line Items]
Total operating revenues		8,661		30,725
Gathering | Volumetric based fee revenues | Usage fees under interruptible contracts
Disaggregation of Revenue [Line Items]
Total operating revenues		131,602		366,482
Transmission
Disaggregation of Revenue [Line Items]
Total operating revenues		89,350		285,429
Transmission | Firm reservation fee revenues | Firm reservation fee revenues
Disaggregation of Revenue [Line Items]
Total operating revenues		82,669		262,666
Transmission | Volumetric based fee revenues
Disaggregation of Revenue [Line Items]
Total operating revenues		6,681		22,763
Transmission | Volumetric based fee revenues | Usage fees under firm contracts
Disaggregation of Revenue [Line Items]
Total operating revenues		5,331		13,981
Transmission | Volumetric based fee revenues | Usage fees under interruptible contracts
Disaggregation of Revenue [Line Items]
Total operating revenues		1,350		8,782
Water
Disaggregation of Revenue [Line Items]
Total operating revenues		22,373		93,438
Water | Firm reservation fee revenues | Firm reservation fee revenues
Disaggregation of Revenue [Line Items]
Total operating revenues		0		0
Water | Volumetric based fee revenues
Disaggregation of Revenue [Line Items]
Total operating revenues		0		0
Water | Volumetric based fee revenues | Usage fees under firm contracts
Disaggregation of Revenue [Line Items]
Total operating revenues		$ 0		0
Water | Volumetric based fee revenues | Usage fees under interruptible contracts
Disaggregation of Revenue [Line Items]
Total operating revenues				$ 0
[1]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of Rice Olympus Midstream LLC (ROM), Strike Force Midstream Holdings LLC (Strike Force) and Rice West Virginia Midstream LLC (Rice WV), which were acquired by EQM effective on May 1, 2018 (the May 2018 Acquisition), and Rice Midstream Partners LP (RMP), which was acquired by EQM effective on July 23, 2018 (the EQM-RMP Merger), because these transactions were between entities under common control.
[2]	Operating revenues included affiliate revenues from EQT Corporation and subsidiaries (collectively, EQT) of $276.9 million and $154.2 million for the three months ended September 30, 2018 and 2017, respectively, and $827.8 million and $445.8 million for nine months ended September 30, 2018 and 2017, respectively. See Note F.

Revenue from Contracts with C_5

Revenue from Contracts with Customers - Summary of Remaining Performance Obligations (Details) $ in Thousands	Sep. 30, 2018USD ($)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 207,095
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	888,863
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	967,895
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	972,959
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	967,893
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	5,448,794
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	9,453,499
Transmission | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 94,077
Remaining performance obligations, expected timing	3 months
Transmission | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 346,893
Remaining performance obligations, expected timing	1 year
Transmission | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 344,328
Remaining performance obligations, expected timing	1 year
Transmission | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 339,588
Remaining performance obligations, expected timing	1 year
Transmission | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 334,522
Remaining performance obligations, expected timing	1 year
Transmission | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 2,477,808
Remaining performance obligations, expected timing
Transmission | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 3,937,216
Time-and-materials contract | Gathering | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 113,018
Remaining performance obligations, expected timing	3 months
Time-and-materials contract | Gathering | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 476,270
Remaining performance obligations, expected timing	1 year
Time-and-materials contract | Gathering | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 552,197
Remaining performance obligations, expected timing	1 year
Time-and-materials contract | Gathering | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 562,196
Remaining performance obligations, expected timing	1 year
Time-and-materials contract | Gathering | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 562,196
Remaining performance obligations, expected timing	1 year
Time-and-materials contract | Gathering | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 2,834,111
Remaining performance obligations, expected timing
Time-and-materials contract | Gathering | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 5,099,988
Minimum volume commitment contract | Gathering | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2018-10-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 0
Remaining performance obligations, expected timing	3 months
Minimum volume commitment contract | Gathering | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 65,700
Remaining performance obligations, expected timing	1 year
Minimum volume commitment contract | Gathering | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 71,370
Remaining performance obligations, expected timing	1 year
Minimum volume commitment contract | Gathering | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 71,175
Remaining performance obligations, expected timing	1 year
Minimum volume commitment contract | Gathering | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 71,175
Remaining performance obligations, expected timing	1 year
Minimum volume commitment contract | Gathering | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 136,875
Minimum volume commitment contract | Gathering | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: (nil)
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total	$ 416,295

Equity and Net Income per Lim_3

Equity and Net Income per Limited Partner Unit - Narrative (Details) - shares	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Class of Stock [Line Items]
Partners' capital account, units issued (in shares)			9,608		0
Number of common units held by parent (in shares)	120,456,425		120,456,425		80,581,758
Number of general partner units held by parent (in shares)	121,899,440		121,899,440		82,024,773
Partners' capital, units acquired (in shares)			5,889,282
Phantom Units
Class of Stock [Line Items]
Weighted average limited partner units outstanding - basic (in shares)	17,816	21,298	19,699	20,757
EQT | EQGP
Class of Stock [Line Items]
General partner's ownership interest (as a percent)			100.00%
Limited Partner Common Units
Class of Stock [Line Items]
Partners' capital account, units issued (in shares)			9,608
Number of general partner units held by parent (in shares)	120,456,425		120,456,425		80,581,758
Partners' capital, units acquired (in shares)			5,889,282
Limited Partner Common Units | EQGP | EQM
Class of Stock [Line Items]
Number of common units held by parent (in shares)	21,811,643		21,811,643
Ownership interest (as a percent)			17.90%
Limited Partner Common Units | EQT | EQM
Class of Stock [Line Items]
Ownership interest (as a percent)			12.70%
Partners' capital, units acquired (in shares)			15,433,812
Limited Partner Common Units | EQT | EQGP
Class of Stock [Line Items]
Ownership interest (as a percent)			91.30%
General Partner Units
Class of Stock [Line Items]
Partners' capital account, units issued (in shares)			0
Number of general partner units held by parent (in shares)	1,443,015		1,443,015		1,443,015
Partners' capital, units acquired (in shares)			0
General Partner Units | EQGP | EQM
Class of Stock [Line Items]
Number of general partner units held by parent (in shares)	1,443,015		1,443,015
General partner's ownership interest (as a percent)			1.20%

Equity and Net Income per Lim_4

Equity and Net Income per Limited Partner Unit - Summary of Units Issued (Details) - shares	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Increase (Decrease) in Partners' Capital
Balance at January 1, 2018	82,024,773
Common units issued (in shares)	9,608	0
May 2018 Acquisition consideration	5,889,282
Balance at September 30, 2018	121,899,440	82,024,773
Limited Partner Common Units
Increase (Decrease) in Partners' Capital
Balance at January 1, 2018	80,581,758
Common units issued (in shares)	9,608
May 2018 Acquisition consideration	5,889,282
Balance at September 30, 2018	120,456,425	80,581,758
General Partner Units
Increase (Decrease) in Partners' Capital
Balance at January 1, 2018	1,443,015
Common units issued (in shares)	0
May 2018 Acquisition consideration	0
Balance at September 30, 2018	1,443,015	1,443,015
EQM-RMP Merger
Increase (Decrease) in Partners' Capital
Common units issued (in shares)	33,975,777
EQM-RMP Merger | Limited Partner Common Units
Increase (Decrease) in Partners' Capital
Common units issued (in shares)	33,975,777
EQM-RMP Merger | General Partner Units
Increase (Decrease) in Partners' Capital
Common units issued (in shares)	0

Financial Information by Busi_3

Financial Information by Business Segment - Narrative (Details) - segment	2 Months Ended	7 Months Ended
	Sep. 30, 2018	Jul. 22, 2018
Segment Reporting [Abstract]
Number of business segments	3	2

Financial Information by Busi_4

Financial Information by Business Segment - Schedule of Segment Information (Details) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018		Sep. 30, 2017		Jun. 30, 2018	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2016
Revenues from external customers (including affiliates):
Total operating revenues	[1],[2]	$ 364,584	$ 206,293	$ 1,110,307		$ 603,180
Operating income (loss):
Total operating income	[1]	233,500	145,702	745,166		432,298
Reconciliation of operating income to net income:
Equity income	[1],[3]	16,087	6,025	35,836	[4]	15,413	[4]
Other income	[1]	1,345	637	3,193		3,576
Net interest expense	[1],[5]	41,005	9,426	76,740		26,014
Net income	[1]	209,927	142,938	707,455	[4],[6]	425,273	[4],[6]
Segment assets:
Total assets	[7]	9,266,191		9,266,191					$ 7,998,835
Depreciation:
Depreciation	[1]	43,567	22,244	126,957	[4]	64,191	[4]
Expenditures for segment assets:
Accrued capital expenditures		91,300	26,500	91,300		26,500		$ 84,600	90,700	$ 31,200	$ 26,700
Operating Segments
Segment assets:
Total assets		9,142,025		9,142,025					7,811,933
Depreciation:
Depreciation		43,567	22,244	126,957		64,191
Expenditures for segment assets:
Expenditures for segment assets		240,084	70,494	616,947		224,407
Headquarters, including cash
Segment assets:
Total assets		124,166		124,166					186,902
Gathering
Revenues from external customers (including affiliates):
Total operating revenues		252,861		731,440
Gathering | Operating Segments
Revenues from external customers (including affiliates):
Total operating revenues		252,861	116,522	731,440		330,996
Operating income (loss):
Total operating income		177,902	85,932	510,755		243,061
Segment assets:
Total assets		6,131,380		6,131,380					5,656,094
Depreciation:
Depreciation		25,359	9,983	72,309		28,398
Expenditures for segment assets:
Expenditures for segment assets		194,477	48,182	515,072		150,728
Transmission
Revenues from external customers (including affiliates):
Total operating revenues		89,350		285,429
Transmission | Operating Segments
Revenues from external customers (including affiliates):
Total operating revenues		89,350	89,771	285,429		272,184
Operating income (loss):
Total operating income		58,691	59,770	198,784		189,237
Segment assets:
Total assets		2,833,519		2,833,519					1,947,566
Depreciation:
Depreciation		12,357	12,261	37,228		35,793
Expenditures for segment assets:
Expenditures for segment assets		37,626	22,312	84,517		73,679
Water
Revenues from external customers (including affiliates):
Total operating revenues		22,373		93,438
Water | Operating Segments
Revenues from external customers (including affiliates):
Total operating revenues		22,373	0	93,438		0
Operating income (loss):
Total operating income		(3,093)	0	35,627		0
Segment assets:
Total assets		177,126		177,126					$ 208,273
Depreciation:
Depreciation		5,851	0	17,420		0
Expenditures for segment assets:
Expenditures for segment assets		$ 7,981	$ 0	$ 17,358		$ 0
[1]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of Rice Olympus Midstream LLC (ROM), Strike Force Midstream Holdings LLC (Strike Force) and Rice West Virginia Midstream LLC (Rice WV), which were acquired by EQM effective on May 1, 2018 (the May 2018 Acquisition), and Rice Midstream Partners LP (RMP), which was acquired by EQM effective on July 23, 2018 (the EQM-RMP Merger), because these transactions were between entities under common control.
[2]	Operating revenues included affiliate revenues from EQT Corporation and subsidiaries (collectively, EQT) of $276.9 million and $154.2 million for the three months ended September 30, 2018 and 2017, respectively, and $827.8 million and $445.8 million for nine months ended September 30, 2018 and 2017, respectively. See Note F.
[3]	Represents equity income from Mountain Valley Pipeline, LLC (the MVP Joint Venture). See Note G.
[4]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.
[5]	Net interest expense included interest income on the Preferred Interest in EES of $1.6 million and $1.7 million for the three months ended September 30, 2018 and 2017, respectively, and $5.0 million and $5.1 million for the nine months ended September 30, 2018 and 2017, respectively.
[6]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.
[7]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.

Investment in Unconsolidated _3

Investment in Unconsolidated Entity - Narrative (Details) $ in Thousands		1 Months Ended		3 Months Ended	9 Months Ended
		Oct. 31, 2018USD ($)	Sep. 30, 2018USD ($)mi	Dec. 31, 2018USD ($)	Sep. 30, 2018USD ($)mi	Sep. 30, 2017USD ($)	Dec. 31, 2017USD ($)
Schedule of Equity Method Investments [Line Items]
Capital call notice paid in July 2018	[1]				$ 446,049	$ 103,448
Capital call notice expected to be paid	[2]		$ 463,733		$ 463,733		$ 105,734
Variable Interest Entity, Not Primary Beneficiary | MVP Joint Venture
Schedule of Equity Method Investments [Line Items]
Ownership interest			45.50%		45.50%
Capital contribution payable to MVP Joint Venture			$ 456,000
Maximum financial statement exposure			$ 1,391,000		$ 1,391,000
Variable Interest Entity, Not Primary Beneficiary | MVP Southgate Project
Schedule of Equity Method Investments [Line Items]
Ownership interest			32.70%		32.70%
MVP
Schedule of Equity Method Investments [Line Items]
Length of pipeline (in miles) | mi			300		300
MVP | Variable Interest Entity, Not Primary Beneficiary
Schedule of Equity Method Investments [Line Items]
Issuance of performance guarantee			$ 91,000		$ 91,000
Beneficial Owner | MVP Joint Venture
Schedule of Equity Method Investments [Line Items]
Percentage of ownership interest					66.67%
Scenario, Forecast | Variable Interest Entity, Not Primary Beneficiary | MVP Joint Venture
Schedule of Equity Method Investments [Line Items]
Capital call notice paid in July 2018		$ 175,200
Capital call notice expected to be paid				$ 280,800
Scenario, Forecast | Variable Interest Entity, Not Primary Beneficiary | MVP Southgate Project
Schedule of Equity Method Investments [Line Items]
Capital contribution payable to MVP Joint Venture				$ 7,700
EQM | MVP Southgate Project
Schedule of Equity Method Investments [Line Items]
Length of pipeline (in miles) | mi			70		70
[1]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.
[2]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.

Investment in Unconsolidated _4

Investment in Unconsolidated Entity - Schedule of Unaudited Condensed Financial Statements for the Investment in Unconsolidated Equity (Details) - MVP Joint Venture - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Condensed Consolidated Balance Sheets
Current assets	$ 1,260,789		$ 1,260,789		$ 330,271
Noncurrent assets	2,330,467		2,330,467		747,728
Total assets	3,591,256		3,591,256		1,077,999
Current liabilities	726,528		726,528		65,811
Equity	2,864,728		2,864,728		1,012,188
Total liabilities and equity	3,591,256		3,591,256		$ 1,077,999
Condensed Statements of Consolidated Operations
Net interest income	11,958	$ 3,227	25,873	$ 8,205
AFUDC - equity	23,417	10,055	52,906	25,710
Net income	$ 35,375	$ 13,282	$ 78,779	$ 33,915

Debt - $1 Billion Facility (Det

Debt - $1 Billion Facility (Details)		Dec. 31, 2017USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)
Debt Instrument [Line Items]
Letters of credit outstanding	[1]	$ 466,000,000	$ 22,000,000		$ 22,000,000
Revolving Credit Facility | $1 Billion Credit Facility
Debt Instrument [Line Items]
Borrowings outstanding		180,000,000	22,000,000		22,000,000
Letters of credit outstanding		0	1,000,000		1,000,000
Revolving Credit Facility | RMP $850 Million Facility
Debt Instrument [Line Items]
Letters of credit outstanding			1,000,000		1,000,000
Line of Credit | $1 Billion Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 1,000,000,000		$ 1,000,000,000
Consolidated leverage ratio for certain measurement periods (not more than)			5		5
Consolidated leverage ratio (not more than)			5.50		5.50
Maximum amount of outstanding short-term loans at any time during the period			$ 74,000,000	$ 177,000,000	$ 420,000,000
Average daily balance of short-term loans outstanding			$ 22,000,000	$ 95,000,000	$ 147,000,000	$ 32,000,000
Weighted average annual interest rate			3.70%	2.70%	3.20%
Line of Credit | RMP $850 Million Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 850,000,000		$ 850,000,000
Maximum amount of outstanding short-term loans at any time during the period		$ 286,000,000	260,000,000		375,000,000
Average daily balance of short-term loans outstanding			$ 249,000,000		$ 300,000,000
Weighted average annual interest rate			4.10%		3.80%
Line of Credit | $2 Billion Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity			$ 3,000,000,000		$ 3,000,000,000
EQM | Line of Credit | $1 Billion Credit Facility
Debt Instrument [Line Items]
Maximum amount of outstanding short-term loans at any time during the period						$ 177,000,000
Weighted average annual interest rate						2.70%
[1]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.

Debt - 364-Day Facility (Detail

Debt - 364-Day Facility (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Line of Credit | $1 Billion Credit Facility
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 1,000,000,000		$ 1,000,000,000
Maximum amount of outstanding short-term loans at any time during the period	74,000,000	$ 177,000,000	420,000,000
Average daily balance of short-term loans outstanding	$ 22,000,000	$ 95,000,000	$ 147,000,000	$ 32,000,000
Weighted average annual interest rate	3.70%	2.70%	3.20%
Revolving Credit Facility
Short-term Debt [Line Items]
Basis spread above commitment fee			0.10%
Revolving Credit Facility | $500 Million Uncommitted Revolving Loan Agreement
Short-term Debt [Line Items]
Line of credit expiration period			364 days
Maximum borrowing capacity	$ 500,000,000		$ 500,000,000
Borrowings outstanding	0		0
Maximum amount of outstanding short-term loans at any time during the period	0	$ 40,000,000		100,000,000
Average daily balance of short-term loans outstanding		$ 11,000,000		$ 30,000,000
Weighted average annual interest rate		2.40%		2.20%
Revolving Credit Facility | $1 Billion Credit Facility
Short-term Debt [Line Items]
Borrowings outstanding	22,000,000		$ 22,000,000		$ 180,000,000
EQM | Line of Credit | $1 Billion Credit Facility
Short-term Debt [Line Items]
Maximum amount of outstanding short-term loans at any time during the period				$ 177,000,000
Weighted average annual interest rate				2.70%
EQM | Revolving Credit Facility | $500 Million Uncommitted Revolving Loan Agreement
Short-term Debt [Line Items]
Borrowings outstanding					$ 0
Maximum amount of outstanding short-term loans at any time during the period	$ 0

Debt - EQM Term Loan Facility (

Debt - EQM Term Loan Facility (Details) - USD ($)	Apr. 25, 2018	Jun. 25, 2018	Sep. 30, 2018	Jun. 25, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Line of Credit | $2.5 Billion EQM Term Loan Facility
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 2,500,000,000
Line of credit expiration period	364 days
Write off of deferred issuance costs				$ 3,000,000
Maximum amount of outstanding short-term loans at any time during the period		$ 1,825,000,000
Average daily balance of short-term loans outstanding		$ 1,231,000,000
Weighted average annual interest rate		3.30%
Line of Credit | $1 Billion Credit Facility
Short-term Debt [Line Items]
Maximum borrowing capacity			$ 1,000,000,000			$ 1,000,000,000
Maximum amount of outstanding short-term loans at any time during the period			74,000,000		$ 177,000,000	420,000,000
Average daily balance of short-term loans outstanding			$ 22,000,000		$ 95,000,000	$ 147,000,000	$ 32,000,000
Weighted average annual interest rate			3.70%		2.70%	3.20%

Debt - RMP $850 Million Facilit

Debt - RMP $850 Million Facility (Details) - USD ($)		Jul. 23, 2018	Dec. 31, 2017	Sep. 30, 2018	Sep. 30, 2018
Debt Instrument [Line Items]
Letters of credit outstanding	[1]		$ 466,000,000	$ 22,000,000	$ 22,000,000
Line of Credit | RMP $850 Million Facility
Debt Instrument [Line Items]
Maximum borrowing capacity				850,000,000	850,000,000
Maximum amount of outstanding short-term loans at any time during the period			$ 286,000,000	260,000,000	375,000,000
Average daily balance of short-term loans outstanding				$ 249,000,000	$ 300,000,000
Weighted average annual interest rate				4.10%	3.80%
Repayment of outstanding borrowings		$ 0
Revolving Credit Facility | RMP $850 Million Facility
Debt Instrument [Line Items]
Letters of credit outstanding				$ 1,000,000	$ 1,000,000
[1]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of the May 2018 Acquisition and the EQM-RMP Merger because these transactions were between entities under common control.

Debt - 2018 Senior Notes (Detai

Debt - 2018 Senior Notes (Details) - USD ($)	3 Months Ended
	Jun. 30, 2018	Sep. 30, 2018
Senior Notes
Debt Instrument [Line Items]
Net proceeds from offering	$ 2,465,800,000
Discount	11,800,000
Debt issuance costs	$ 22,400,000
Senior Notes | EQM 4.75% Senior Notes Due 2023
Debt Instrument [Line Items]
Interest rate (as a percent)	4.75%
Aggregate principal amount	$ 1,100,000,000
Senior Notes | EQM 5.50% Senior Notes Due 2028
Debt Instrument [Line Items]
Interest rate (as a percent)	5.50%
Aggregate principal amount	$ 850,000,000
Senior Notes | EQM 6.50% Senior Notes Due 2048
Debt Instrument [Line Items]
Interest rate (as a percent)	6.50%
Aggregate principal amount	$ 550,000,000
Line of Credit | RMP $850 Million Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 850,000,000

Fair Value Measurements (Detail

Fair Value Measurements (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
EES | Carrying Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Value of preferred interest	$ 116	$ 119
Level 3 | EES | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Value of preferred interest	122	133
Fair Value, Measurements, Recurring | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Carrying value of long-term debt	3,455	987
Fair Value, Measurements, Recurring | Level 2 | Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Estimated fair value of long-term debt	$ 3,532	$ 1,006

Distributions (Details)

Distributions (Details) - USD ($) $ / shares in Units, $ in Millions		Oct. 25, 2018	Oct. 23, 2018	Apr. 24, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	[2]	Sep. 30, 2017	[2]
Distribution Made to Limited Partner [Line Items]
Cash distribution to the company's common and subordinated unitholders declared (in dollars per share)	[1]				$ 1.115	$ 0.98	$ 3.270		$ 2.805
Rice Midstream Partners, LP
Distribution Made to Limited Partner [Line Items]
Maximum period for distribution of available cash to unit holders				45 days
Subsequent Event
Distribution Made to Limited Partner [Line Items]
Cash distribution to the company's common and subordinated unitholders declared (in dollars per share)			$ 1.115
Incentive distribution rights		$ 71
Subsequent Event | Limited Partner
Distribution Made to Limited Partner [Line Items]
Cash distribution declared to the limited partner		24.3
Subsequent Event | General Partner Units
Distribution Made to Limited Partner [Line Items]
Cash distribution declared to the general partner		$ 2.5
[1]	Represents the cash distributions declared related to the period presented. See Note J.
[2]	As discussed in Note A, the consolidated financial statements of EQM have been retrospectively recast to include the pre-acquisition results of Rice Olympus Midstream LLC (ROM), Strike Force Midstream Holdings LLC (Strike Force) and Rice West Virginia Midstream LLC (Rice WV), which were acquired by EQM effective on May 1, 2018 (the May 2018 Acquisition), and Rice Midstream Partners LP (RMP), which was acquired by EQM effective on July 23, 2018 (the EQM-RMP Merger), because these transactions were between entities under common control.