Acquisitions - Unaudited Pro Forma Information (Details) - Alta Acquisition - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2021
Business Acquisition [Line Items]
Pro forma sales of natural gas, NGLs and oil	$ 1,839,002	$ 4,437,755
Pro forma loss on derivatives	(3,268,035)	(4,918,616)
Pro forma net marketing services and other	7,798	28,452
Pro forma total operating revenues	(1,421,235)	(452,409)
Pro forma net loss	(1,974,059)	(2,950,427)
Pro forma net loss attributable to noncontrolling interests	601	25
Pro forma net loss attributable to EQT Corporation	$ (1,974,660)	$ (2,950,452)
Pro forma loss per share (basic) (in dollars per share)	$ (5.53)	$ (9.67)
Pro forma loss per share (diluted) (in dollars per share)	$ (5.53)	$ (9.67)