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, 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)	(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	(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 units 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 income (loss)	(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
Beginning Balance (in shares) at Dec. 31, 2016		172,827
Beginning Balance at Dec. 31, 2016	9,119,247	$ 3,349,166	2,509,073	2,042	3,258,966
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	373,350		205,118		168,232
Net change in cash flow hedges:
Natural gas, net of tax benefit	(2,560)			(2,560)
Interest rate, net of tax expense	72			72
Pension and other post-retirement benefits liability adjustment, net of tax expense	153			153
Dividends	(10,413)		(10,413)
Stock-based compensation plans, net (in shares)		500
Stock-based compensation plans, net	9,715	$ 9,525			190
Distributions to noncontrolling interests	(111,994)				(111,994)
Ending Balance (in shares) at Jun. 30, 2017		173,327
Ending Balance at Jun. 30, 2017	9,377,570	$ 3,358,691	2,703,778	(293)	3,315,394
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	122,645
Net change in cash flow hedges:
Natural gas, net of tax benefit	(1,672)
Pension and other post-retirement benefits liability adjustment, net of tax expense	77
Ending Balance (in shares) at Jun. 30, 2017		173,327
Ending Balance at Jun. 30, 2017	$ 9,377,570	$ 3,358,691	$ 2,703,778	$ (293)	$ 3,315,394