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Nature of Business	3 Months Ended
Nature of Business	Mar. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Nature of Business	Note 1 - Nature of Business Questar Corporation (Questar or the Company) is a Rockies-based integrated natural gas company with three complementary and wholly-owned lines of business: - Questar Gas Company (Questar Gas) provides retail natural gas distribution in Utah, Wyoming and Idaho. - Wexpro Company (Wexpro) develops and produces natural gas from cost-of-service reserves for Questar Gas. - Questar Pipeline Company (Questar Pipeline) operates interstate natural gas pipelines and storage facilities in the western United States and provides other energy services. Questar is headquartered in Salt Lake City, Utah. Shares of Questar common stock trade on the New York Stock Exchange (NYSE:STR).