1.0.0.3 false Operations by Line 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 Operations by Line of Business 1 us-gaap_ScheduleOfSegmentReportingInformationBySegmentTextBlock us-gaap true na duration string No definition available. false false false false false false false false false 1 false false 0 0 Note 12 - Operations by Line of Business Questar's major lines of business include gas and oil exploration and production (Questar E&P and Wexpro), midstream field services (Gas Management), energy marketing (Energy Trading), interstate gas transportation (Questar Pipeline), and retail gas distribution (Questar Gas). Line-of-business information is presented according to senior management's basis for evaluating performance considering differences in the nature of products, services and regulation among other factors. Following is a summary of operations by line of business: 3 Months Ended Sept. 30, 9 Months Ended Sept. 30, 2009 2008 2009 2008 (in millions)Revenues from Unaffiliated Customers Questar E&P $294.6 $381.0 $ 900.3 $1,030.1 Wexpro 5.2 12.0 11.0 28.8 Gas Management 65.3 73.8 166.5 209.1 Energy Trading and other 109.8 134.2 301.4 521.6 Market Resources 474.9 601.0 1,379.2 1,789.6 Questar Pipeline 42.6 43.8 126.3 131.8 Questar Gas 82.3 115.2 626.5 664.9 Total $599.8 $760.0 $2,132.0 $2,586.3 Revenues from Affiliated Companies Wexpro $ 53.8 $ 54.7 $166.6 $153.4 Gas Management 6.4 6.1 19.6 17.4 Energy Trading and other 80.6 229.2 250.9 713.3 Market Resources 140.8 290.0 437.1 884.1 Questar Pipeline18.3 18.2 55.7 56.4 Questar Gas 0.1 1.8 0.6 6.1 Total $159.2 $310.0 $493.4 $946.6 Operating Income(Loss) Questar E&P $104.6 $272.4 $317.1 $611.2 Wexpro 31.6 29.7 90.4 83.3 Gas Management 35.1 42.6 78.9 113.5 Energy Trading and other 0.5 8.9 9.9 28.2 Market Resources 171.8 353.6 496.3 836.2 Questar Pipeline 28.2 31.6 87.4 87.7 Questar Gas (8.4) (9.7) 50.4 44.8 Corporate 0.1 Total $191.6 $375.5 $634.2 $968.7 Net Income (Loss) Attributable to Questar Questar E&P $49.6 $146.8 $ 64.3 $360.1 Wexpro 20.6 20.4 59.2 55.4 Gas Management 21.5 24.5 47.4 64.7 Energy Trading and other 0.3 5.9 6.5 18.8 Market Resources 92.0 197.6 177.4 499.0 Questar Pipeline 14.1 15.4 43.8 44.0 Questar Gas (8.1) (8.8) 21.7 19.8 Corporate 0.2 0.4 (0.2)Total $98.2 $204.2 $243.3 $562.6 Note 12 - Operations by Line of Business Questar's major lines of business include gas and oil exploration and production (Questar E&P and Wexpro), midstream false false No definition available. No authoritative reference available. false false 1 2 false UnKnown UnKnown UnKnown false true