Debt	6 Months Ended
Jun. 30, 2013
Debt Disclosure [Abstract]
Debt	Note 11 - Debt 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. 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.

Debt

6 Months Ended

Jun. 30, 2013

Note 11 - Debt

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.

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.