Acquisitions - Narrative (Details)				9 Months Ended
	Jul. 01, 2025 USD ($) a MMcf $ / shares shares	Jul. 22, 2024 USD ($) $ / shares shares	Apr. 11, 2024 USD ($)	Sep. 30, 2025 USD ($)	Sep. 30, 2024 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2021
Business Combination, Separately Recognized Transaction [Line Items]
Issuance of EQT common stock as consideration for acquisition (Note 11)				$ 1,471,365,000	$ 5,548,608,000
Goodwill				$ 2,062,462,000		$ 2,079,481,000
Olympus Energy Acquisition
Business Combination, Separately Recognized Transaction [Line Items]
Area of land acquired | a	90,000
Annual minimum volume (in Bcf per day) | MMcf	500
Equity interest issued or issuable, number of shares (in shares) | shares	25,229,166
Issuance of EQT common stock as consideration for acquisition (Note 11)	$ 1,471,365,000
Share price (in dollars per share) | $ / shares	$ 58.32
Cash payments to acquire business	$ 474,640,000
Goodwill	0
Consideration to be paid	$ 1,946,005,000
Equitrans Midstream Merger
Business Combination, Separately Recognized Transaction [Line Items]
Equity interest issued or issuable, number of shares (in shares) | shares		152,427,848
Issuance of EQT common stock as consideration for acquisition (Note 11)		$ 5,548,608,000
Share price (in dollars per share) | $ / shares		$ 35.88
Cash payments to acquire business		$ 29,000
Goodwill		$ 2,062,462,000
Number of shares issuable for each existing share converted (in shares)		0.3504
Purchase and redemption price		$ 685,337,000
Goodwill attributed to synergies expected from the vertical integration of the business		1,232,000,000
Goodwill attributable to additional tax liabilities arising from the difference between preliminary purchase price allocation and tax basis		831,000,000
Consideration to be paid		5,994,233,000
Equitrans Midstream Merger | Employees Of Equitrans Midstream
Business Combination, Separately Recognized Transaction [Line Items]
Issuance of EQT common stock as consideration for acquisition (Note 11)		$ 79,500,000
NEPA Gathering System Acquisition
Business Combination, Separately Recognized Transaction [Line Items]
Ownership interest acquired (in percent)			33.75%				50.00%
Consideration to be paid			$ 205,000,000