2.4.0.82111100 - Disclosure - Debttruefalsefalse1false falsefalseD2013Q2YTDhttp://www.sec.gov/CIK0000751652duration2013-01-01T00:00:002013-06-30T00:00:001true 1us-gaap_DebtDisclosureAbstractus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Debt Disclosure [Abstract]2false 2us-gaap_DebtDisclosureTextBlockus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;font-size:10pt;">Note 11 - Debt</div><div style="line-height:120%;font-size:10pt;"> </div><div style="line-height:120%;text-align:left;font-size:10pt;">The Company has a revolving credit facility with various lenders to provide back-up credit liquidity support for its commercial paper program. Credit commitments under this revolving credit facility totaled $750.0 million at June 30, 2013, with no amounts borrowed. This revolving credit facility has interest-rate options generally below the prime interest rate and carries commitment fees on the unused balance. In April 2013, Questar amended and restated its revolving credit facility to increase its size from $500.0 million to $750.0 million and extend its maturity from August 31, 2016 to April 19, 2018. Under the facility, consolidated funded debt cannot exceed 70% of consolidated capitalization. Commercial paper outstanding amounted to $206.0 million at June 30, 2013, $190.0 million at June 30, 2012 and $263.0 million at December 31, 2012.</div><div style="line-height:120%;font-size:10pt;"> </div><div style="line-height:120%;font-size:10pt;">Except for the amendment and restatement to the Company's revolving credit facility, there have not been any significant new borrowings or modifications of existing financing arrangements at Questar, Questar Gas or Questar Pipeline since December 31, 2012.</div></div>falsefalsefalsenonnum:textBlockItemTypenaThe entire disclosure for information about short-term and long-term debt arrangements, which includes amounts of borrowings under each line of credit, note payable, commercial paper issue, bonds indenture, debenture issue, own-share lending arrangements and any other contractual agreement to repay funds, and about the underlying arrangements, rationale for a classification as long-term, including repayment terms, interest rates, collateral provided, restrictions on use of assets and activities, whether or not in compliance with debt covenants, and other matters important to users of the financial statements, such as the effects of refinancing and noncompliance with debt covenants.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 129 -Paragraph 2, 4 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 false0DebtfalseDebtUnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.questar.com/role/Debt12