1.0.0.3 false Nature of Business false 1 $ false false u000 Standard http://www.xbrl.org/2003/iso4217 USD iso4217 0 u001 Standard http://www.xbrl.org/2003/instance shares xbrli 0 u002 Divide http://www.xbrl.org/2003/iso4217 USD iso4217 http://www.xbrl.org/2003/instance shares xbrli 0 2 Notes To Financial Statements [Abstract] 0 str_NotesToFinancialStatementsAbstract str false na duration string No definition available. false false false false false true false false false 1 false false 0 0 false false No definition available. false 3 Nature of Business 1 us-gaap_NatureOfOperations us-gaap true na duration string No definition available. false false false false false false false false false 1 false false 0 0 Note 1 - Nature of Business Questar Corporation (Questar or the Company) is a natural gas-focused energy company with five major lines of business - gas and oil exploration and production, midstream field services, energy marketing, interstate gas transportation, and retail gas distribution - which are conducted through its three principal subsidiaries: - Questar Market Resources, Inc. (Market Resources) is a subholding company that operates through four principal subsidiaries. Questar Exploration and Production Company (Questar E&P) acquires, explores for, develops and produces natural gas, oil and NGL. Wexpro Company (Wexpro) manages, develops and produces cost-of-service reserves for gas utility affiliate Questar Gas. Questar Gas Management Company (Gas Management) provides midstream field services including natural gas-gathering and processing services for affiliates and third parties. Questar Energy Trading Company (Energy Trading) markets equity and third-party natural gas and oil, provides risk-management services and owns and operates an underground gas-storage reservoir. - Questar Pipeline Company (Questar Pipeline) provides interstate natural gas transportation and storage and other energy services. - Questar Gas Company (Questar Gas) provides retail natural gas distribution services in Utah, Wyoming and Idaho. Questar operates in the Rocky Mountain and Midcontinent regions of the United States of America and is headquartered in Salt Lake City, Utah. Shares of Questar common stock trade on the New York Stock Exchange (NYSE:STR). Note 1 - Nature of Business Questar Corporation (Questar or the Company) is a natural gas-focused energy company with five major lines of business - gas and false false No definition available. No authoritative reference available. false false 1 2 false UnKnown UnKnown UnKnown false true