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Regulatory Matters	6 Months Ended
Regulatory Matters	Jun. 30, 2017
Regulated Operations [Abstract]
Regulatory Matters	Note 7. Regulatory Matters As a public utility, Questar Gas is subject to the jurisdiction of the Utah Commission and the Wyoming Commission. Natural gas sales and transportation services are provided under rate schedules approved by the two regulatory commissions. There have been no significant developments regarding the pending regulatory matters disclosed in Note 10 to the Financial Statements in Questar Gas' Annual Report on Form 10-K for the year ended December 31, 2016.