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Midstream Streamlining Transactions and Financing - Additional Information (Details)				3 Months Ended	9 Months Ended
	Jul. 23, 2018 USD ($) shares	May 22, 2018 USD ($) shares	May 01, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	May 21, 2018	Apr. 25, 2018 USD ($)
Business Acquisition [Line Items]
Payments to acquire businesses, gross					$ 0	$ 818,957,000
Noncontrolling interest, decrease					$ 175,000,000
Drop-Down Transactions
Business Acquisition [Line Items]
Equity interests issued and issuable (in shares)		$ 5,889,282
Payments to acquire businesses, gross		1,150,000,000
Additional paid in capital, increase (decrease)		15,500,000
Noncontrolling interest, decrease		20,300,000
Deferred tax liabilities, increase (decrease)		4,800,000
IDR Transaction
Business Acquisition [Line Items]
Additional paid in capital, increase (decrease)		(35,100,000)
Increase from business combination		46,100,000
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets		$ 11,000,000
Midstream Mergers
Business Acquisition [Line Items]
Additional paid in capital, increase (decrease)	$ (138,800,000)
Increase from business combination	189,100,000
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets	$ 50,300,000
EQM | Senior Notes | Senior Notes Due 2023
Business Acquisition [Line Items]
Interest rate, stated percentage				4.75%	4.75%
Face amount				$ 1,100,000,000.0	$ 1,100,000,000.0
EQM | Senior Notes | Senior Notes Due 2028
Business Acquisition [Line Items]
Interest rate, stated percentage				5.50%	5.50%
Face amount				$ 850,000,000	$ 850,000,000
EQM | Senior Notes | Senior Notes Due 2048
Business Acquisition [Line Items]
Interest rate, stated percentage				6.50%	6.50%
Face amount				$ 550,000,000	$ 550,000,000
EQM | Senior Notes | The Notes
Business Acquisition [Line Items]
Proceeds from debt				2,465,800,000
Unamortized discount				11,800,000	11,800,000
Debt issuance costs, gross				22,400,000	22,400,000
EQM | EQM Term Loan Facility
Business Acquisition [Line Items]
Line of credit facility, maximum borrowing capacity								$ 2,500,000,000.0
EQM | Revolving credit facility
Business Acquisition [Line Items]
Line of credit facility, maximum borrowing capacity				$ 1,000,000,000	$ 1,000,000,000
EQM | Gulfport Transaction
Business Acquisition [Line Items]
Payments to acquire businesses and interest in affiliates			$ 175,000,000
EQM | Midstream Mergers
Business Acquisition [Line Items]
Equity interest issued or issuable, number of shares (in shares) | shares	34,000,000.0
Repayments of debt	$ 260,000,000
EQM | Midstream Mergers | Indirect Wholly Owned Subsidiary
Business Acquisition [Line Items]
Equity interest issued or issuable, number of shares (in shares) | shares	9,554,530
EQGP | IDR Transaction
Business Acquisition [Line Items]
Equity interest issued or issuable, number of shares (in shares) | shares		36,293,766
Rice Midstream Partners, LP | Midstream Mergers
Business Acquisition [Line Items]
Common share conversion ratio	0.3319
SpinCo
Business Acquisition [Line Items]
Distribution rate of common stock				80.10%	80.10%
Strike Force Midstream LLC | Strike Force Midstream Holdings
Business Acquisition [Line Items]
General partner interest					75.00%
Strike Force Midstream LLC | EQM
Business Acquisition [Line Items]
Ownership percentage by parent			25.00%	100.00%	100.00%
EQGP | IDR Transaction
Business Acquisition [Line Items]
Ownership percentage by parent		91.30%					90.10%

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