STATEMENTS OF CONSOLIDATED EQUITY (USD $) In Thousands, unless otherwise specified	Total	Common Stock	Retained Earnings	Accumulated Other Comprehensive (Loss) Income	Noncontrolling Interests in Consolidated Subsidiaries
Balance at Dec. 31, 2010	$ 3,078,696	$ 1,244,826	$ 1,795,766	$ 38,104
Balance (in shares) at Dec. 31, 2010		149,153
Increase (Decrease) in Stockholders' Equity
Net income	479,769		479,769
Net change in cash flow hedges:
Natural gas, net of tax (benefit) expense of ($50,200), ($61,757)and $110,186 during 2013, 2012 and 2011, respectively	166,840			166,840
Interest rate, net of tax expense (benefit) of $63, $4,833, and ($5,720) during 2013, 2012 and 2011, respectively	(7,433)			(7,433)
Unrealized gain on available-for-sale securities	(4,896)			(4,896)
Pension and other post-retirement benefits liability adjustment, net of tax (benefit) expense of $16,115, ($1,992) and ($2,752) during 2013, 2012 and 2011, respectively	(4,474)			(4,474)
Dividends ($0.12, $0.88 and $0.88 per share during 2013, 2012 and 2011, respectively)	(131,625)		(131,625)
Stock-based compensation plans, net	16,953	16,953
Stock-based compensation plans, net (in shares)		324
Balance at Dec. 31, 2011	3,593,830	1,261,779	2,143,910	188,141
Balance (in shares) at Dec. 31, 2011		149,477
Increase (Decrease) in Stockholders' Equity
Net income	196,411		183,395		13,016
Net change in cash flow hedges:
Natural gas, net of tax (benefit) expense of ($50,200), ($61,757)and $110,186 during 2013, 2012 and 2011, respectively	(93,878)			(93,878)
Interest rate, net of tax expense (benefit) of $63, $4,833, and ($5,720) during 2013, 2012 and 2011, respectively	6,369			6,369
Pension and other post-retirement benefits liability adjustment, net of tax (benefit) expense of $16,115, ($1,992) and ($2,752) during 2013, 2012 and 2011, respectively	(1,085)			(1,085)
Dividends ($0.12, $0.88 and $0.88 per share during 2013, 2012 and 2011, respectively)	(131,803)		(131,803)
Stock-based compensation plans, net	41,838	41,621			217
Stock-based compensation plans, net (in shares)		632
Distributions to noncontrolling interests ($1.55 and $0.35 per common unit during 2013 and 2012, respectively)	(5,031)				(5,031)
Issuance of common units of EQT Midstream Partners, LP	276,780				276,780
Deferred taxes related to the public offering of common units of EQT Midstream Partners, LP	5,371	5,371
Balance at Dec. 31, 2012	3,888,802	1,308,771	2,195,502	99,547	284,982
Balance (in shares) at Dec. 31, 2012		150,109
Increase (Decrease) in Stockholders' Equity
Net income	437,815		390,572		47,243
Net change in cash flow hedges:
Natural gas, net of tax (benefit) expense of ($50,200), ($61,757)and $110,186 during 2013, 2012 and 2011, respectively	(76,489)			(76,489)
Interest rate, net of tax expense (benefit) of $63, $4,833, and ($5,720) during 2013, 2012 and 2011, respectively	144			144
Pension and other post-retirement benefits liability adjustment, net of tax (benefit) expense of $16,115, ($1,992) and ($2,752) during 2013, 2012 and 2011, respectively	21,501			21,501
Dividends ($0.12, $0.88 and $0.88 per share during 2013, 2012 and 2011, respectively)	(18,094)		(18,094)
Stock-based compensation plans, net	115,429	114,975			454
Stock-based compensation plans, net (in shares)		775
Distributions to noncontrolling interests ($1.55 and $0.35 per common unit during 2013 and 2012, respectively)	(32,781)				(32,781)
Issuance of common units of EQT Midstream Partners, LP	529,442				529,442
Deferred taxes related to the public offering of common units of EQT Midstream Partners, LP	(1,641)	(1,641)
Balance at Dec. 31, 2013	$ 4,864,128	$ 1,422,105	$ 2,567,980	$ 44,703	$ 829,340
Balance (in shares) at Dec. 31, 2013		150,884