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 (loss) income	284,915		178,963		105,952
Net change in cash flow hedges:
Natural gas, net of tax benefit	(83,332)			(83,332)
Interest rate, net of tax expense	72			72
Pension and other post-retirement benefits liability adjustment, net of tax expense	404			404
Dividends ($0.06 per share)	(9,141)		(9,141)
Stock-based compensation plans, net (in shares)		846
Stock-based compensation plans, net	28,555	$ 28,006			549
Distributions to noncontrolling interests	(52,672)				(52,672)
Issuance of common units of EQT Midstream Partners, LP	696,582				696,582
Sale of common units of EQT GP Holdings, LP	674,374				674,374
Changes in ownership of consolidated subsidiaries	(264,204)	$ 444,841			(709,045)
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 Jun. 30, 2015		152,404
Ending Balance at Jun. 30, 2015	7,645,241	$ 1,937,442	3,085,173	116,638	2,505,988
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	63,747
Net change in cash flow hedges:
Natural gas, net of tax benefit	(42,581)
Pension and other post-retirement benefits liability adjustment, net of tax expense	202
Ending Balance (in shares) at Jun. 30, 2015		152,404
Ending Balance at Jun. 30, 2015	7,645,241	$ 1,937,442	3,085,173	116,638	2,505,988
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 (loss) income	(92,382)		(253,009)		160,627
Net change in cash flow hedges:
Natural gas, net of tax benefit	(28,364)			(28,364)
Interest rate, net of tax expense	72			72
Pension and other post-retirement benefits liability adjustment, net of tax expense	9,835			9,835
Dividends ($0.06 per share)	(9,776)		(9,776)
Stock-based compensation plans, net (in shares)		643
Stock-based compensation plans, net	10,023	$ 9,862			161
Distributions to noncontrolling interests	(87,911)				(87,911)
Issuance of common shares of EQT Corporation (in shares)		19,550
Issuance of common shares of EQT Corporation	1,226,006	$ 1,226,006
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 Jun. 30, 2016		172,747
Ending Balance at Jun. 30, 2016	9,257,453	$ 3,310,362	2,719,427	27,921	3,199,743
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(180,807)
Net change in cash flow hedges:
Natural gas, net of tax benefit	(15,940)
Pension and other post-retirement benefits liability adjustment, net of tax expense	9,622
Ending Balance (in shares) at Jun. 30, 2016		172,747
Ending Balance at Jun. 30, 2016	$ 9,257,453	$ 3,310,362	$ 2,719,427	$ 27,921	$ 3,199,743