Interim Financial Information (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Quarterly Financial Information Disclosure [Abstract]
Total operating revenues	$ 1,129,286	$ 660,313	$ 690,893	$ 897,523	$ 379,022	$ 556,726	$ 127,531	$ 545,069	$ 3,378,015	$ 1,608,348	$ 2,339,762
Operating income	214,849	137,694	189,794	390,644	(189,466)	108,457	(324,492)	127,201	932,981	(278,300)	563,139
Net income (loss)	1,379,335	105,457	122,645	250,705	(108,785)	70,104	(180,807)	88,425	1,858,142	(131,063)	321,886
Net income (loss) attributable to EQT Corporation	$ 1,280,071	$ 23,340	$ 41,126	$ 163,992	$ (191,958)	$ (8,016)	$ (258,645)	$ 5,636	$ 1,508,529	$ (452,983)	$ 85,171
Basic:
Net income (loss) (in dollars per share)	$ 5.85	$ 0.13	$ 0.24	$ 0.95	$ (1.11)	$ (0.05)	$ (1.55)	$ 0.04	$ 8.05	$ (2.71)	$ 0.56
Diluted:
Net income (loss) (in dollars per share)	$ 5.83	$ 0.13	$ 0.24	$ 0.95	$ (1.11)	$ (0.05)	$ (1.55)	$ 0.04	$ 8.04	$ (2.71)	$ 0.56