Statements of Condensed Consolidated Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Noncontrolling Interests in Consolidated Subsidiaries
Beginning Balance (in shares) at Dec. 31, 2014		151,596
Beginning Balance at Dec. 31, 2014	$ 6,373,063	$ 1,466,192	$ 2,917,129	$ 199,494	$ 1,790,248
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	385,148		219,750		165,398
Net change in cash flow hedges:
Natural gas, net of tax benefit	(122,678)			(122,678)
Interest rate, net of tax expense	108			108
Pension and other post-retirement benefits liability adjustment, net of tax expense	606			606
Dividends ($0.09 per share)	(13,725)		(13,725)
Stock-based compensation plans, net (in shares)		982
Stock-based compensation plans, net	55,034	$ 54,238			796
Distributions to noncontrolling interests	(85,218)				(85,218)
Issuance of common units of EQT Midstream Partners, LP	758,812				758,812
Sale of common units of EQT GP Holdings, LP	674,010				674,010
Changes in ownership of consolidated subsidiaries	(269,512)	$ 453,778			(723,290)
Repurchase and retirement of common stock (in shares)		(38)
Repurchase and retirement of common stock	(3,375)	$ (1,597)	(1,778)
Ending Balance (in shares) at Sep. 30, 2015		152,540
Ending Balance at Sep. 30, 2015	7,752,273	$ 1,972,611	3,121,376	77,530	2,580,756
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	100,233
Net change in cash flow hedges:
Natural gas, net of tax benefit	(39,346)
Pension and other post-retirement benefits liability adjustment, net of tax expense	202
Ending Balance (in shares) at Sep. 30, 2015		152,540
Ending Balance at Sep. 30, 2015	7,752,273	$ 1,972,611	3,121,376	77,530	2,580,756
Beginning Balance (in shares) at Dec. 31, 2015		152,554
Beginning Balance at Dec. 31, 2015	8,028,042	$ 2,049,201	2,982,212	46,378	2,950,251
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(22,278)		(261,025)		238,747
Net change in cash flow hedges:
Natural gas, net of tax benefit	(43,104)			(43,104)
Interest rate, net of tax expense	108			108
Pension and other post-retirement benefits liability adjustment, net of tax expense	9,917			9,917
Dividends ($0.09 per share)	(14,966)		(14,966)
Stock-based compensation plans, net (in shares)		654
Stock-based compensation plans, net	26,372	$ 26,211			161
Distributions to noncontrolling interests	(137,719)				(137,719)
Issuance of common shares of EQT Corporation (in shares)		19,550
Issuance of common shares of EQT Corporation	1,225,999	$ 1,225,999
Issuance of common units of EQT Midstream Partners, LP	217,102				217,102
Changes in ownership of consolidated subsidiaries	(15,194)	$ 25,293			(40,487)
Ending Balance (in shares) at Sep. 30, 2016		172,758
Ending Balance at Sep. 30, 2016	9,274,279	$ 3,326,704	2,706,221	13,299	3,228,055
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	70,104
Net change in cash flow hedges:
Natural gas, net of tax benefit	(14,740)
Pension and other post-retirement benefits liability adjustment, net of tax expense	82
Ending Balance (in shares) at Sep. 30, 2016		172,758
Ending Balance at Sep. 30, 2016	$ 9,274,279	$ 3,326,704	$ 2,706,221	$ 13,299	$ 3,228,055