Income Taxes (Tables)

9 Months Ended

Sep. 30, 2018

Income Tax Disclosure [Abstract]

Schedule of Effective Income Tax Rate Reconciliation

For continuing operations, the statutory U.S. federal income tax rate reconciles to Questar Gas’ effective income tax rate as follows:

Nine Months Ended September 30,	2018			2017
U.S. statutory rate		21.0	%		35.0	%
Increases (reductions) resulting from:
State taxes, net of federal benefit		3.7			3.1
Reversal of excess deferred income taxes		(4.6	)		—
State legislative change		(1.0	)		—
Other, net		(0.6	)		(0.2	)
Effective tax rate		18.5	%		37.9	%