Separation and Distribution and Discontinued Operations - Additional Information (Details)		12 Months Ended
Nov. 12, 2018	Dec. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]
Percentage of ownership transferred	80.10%
Stock dividend (in dollars per share)	0.80
Term of agreement		20 years

Sale of Stock, Percentage of Ownership Transferred

No definition available.

Name:	eqt_SaleofStockPercentageofOwnershipTransferred
Namespace Prefix:	eqt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration