Related-Party Transaction	12 Months Ended
Related-Party Transaction	Dec. 31, 2011
Related-Party Transactions [Abstract]
Related Party Transactions	Note 14 - Related-Party Transactions Questar Pipeline Questar Pipeline receives a substantial portion of its revenues from Questar Gas. Revenues received from Questar Gas were $74.1 million in 2011, $73.9 million in 2010 and $72.1 million in 2009. In 2011, 2010 and 2009 Questar Gas provided technical and communication services to Questar Pipeline. In 2010 and 2009 Questar Gas also provided administrative, accounting, legal, data-processing and regulatory support to Questar Pipeline. Questar Gas provided these services at its cost of $9.6 million in 2011, $20.2 million in 2010 and $20.4 million in 2009. The majority of these costs are allocated and included in operating expenses. The allocation methods are based on the specific nature of the charges. Management believes that the allocation methods are reasonable. Questar performs certain administrative functions for Questar Pipeline. The company was charged for its allocated portion of these services that totaled $22.2 million in 2011, $7.0 million in 2010 and $4.1 million in 2009. These costs are included in operating expenses and are allocated based on each affiliate's proportional share of revenues, net of gas costs; property, plant and equipment; and payroll. Management believes that the allocation method is reasonable. Questar Pipeline has a lease with an affiliate for space in an office building located in Salt Lake City, Utah. Rent expense was $0.9 million in 2011 and $0.8 million in 2010 and 2009. The lease term ends on April 30, 2012, and payments through that date will be $0.3 million. Questar Pipeline borrowed cash from Questar and incurred interest expense of $0.1 million in 2011. Questar Pipeline loaned excess funds to Questar and earned interest income of $0.1 million in 2011, $0.3 million in 2010 and $0.5 million in 2009. Questar Gas In 2011, 2010 and 2009 Questar Gas provided technical and communication services to affiliates. In 2010 and 2009 Questar Gas also provided administrative, accounting, legal, data-processing and regulatory support to affiliates. Questar Gas provided these services at its cost and charged $14.0 million in 2011, $25.9 million in 2010 and $25.6 million in 2009. The majority of these costs are allocated. The allocation methods are based on the specific nature of the charges. Management believes that the allocation methods are reasonable. Questar Gas has reserved transportation capacity on Questar Pipeline for 881 Mdth per day. Questar Gas periodically releases excess capacity and receives a credit from Questar Pipeline for the released capacity revenues and a portion of Questar Pipeline's interruptible transportation revenues. Questar Gas paid for transportation, storage and processing services provided by Questar Pipeline and a subsidiary amounting to $73.7 million in 2011, $73.5 million in 2010 and $71.8 million in 2009, which included demand charges. The costs of these services were included in cost of natural gas sold. Under the terms of the Wexpro Agreement, Questar Gas receives a portion of Wexpro's income from oil operations after recovery of Wexpro's operating expenses and a return on investment. This amount, which is included in revenues and reduces amounts billed to gas distribution customers, was $3.3 million in 2011, $1.1 million in 2010 and $1.0 million in 2009. The amounts that Questar Gas paid Wexpro for the operation of cost-of-service gas properties were $253.4 million in 2011, $240.0 million in 2010 and $225.0 million in 2009. Questar Gas reports these amounts in cost of natural gas sold. Questar Gas has a lease with an affiliate for space in an office building located in Salt Lake City, Utah. Rent expense was $1.1 million in 2011 and $2.5 million in 2010 and 2009. The lease term ends on April 30, 2012, and payments through that date will be $0.4 million. Questar charged Questar Gas for certain administrative functions amounting to $46.9 million in 2011, $13.2 million in 2010 and $8.4 million in 2009. These costs are included in operating expenses and are allocated based on each affiliated company's proportional share of revenues less product costs; property, plant and equipment; and labor costs. Management believes that the allocation method is reasonable. Questar Gas borrowed cash from Questar and incurred interest expense of $0.3 million in 2011, $0.4 million in 2010 and $0.3 million in 2009. Questar Gas loaned excess funds to Questar and earned interest income of $0.1 million in 2009.

This element may be used for the entire related party transactions disclosure as a single block of text. Disclosure may include: the nature of the relationship(s), a description of the transactions, the amount of the transactions, the effects of any change in the method of establishing the terms of the transaction from the previous period, stated interest rate, expiration date, terms and manner of settlement per the agreement with the related party, and amounts due to or from related parties. If the entity and one or more other entities are under common ownership or management control and this control affects the operating results or financial position, disclosure includes the nature of the control relationship even if there are no transactions between the entities. Disclosure may also include the aggregate amount of current and deferred tax expense for each statement of earnings presented where the entity is a member of a group that files a consolidated tax return, the amount of any tax related balances due to or from affiliates as of the date of each statement of financial position presented, the principal provisions of the method by which the consolidated amount of current and deferred tax expense is allocated to the members of the group and the nature and effect of any changes in that method. Examples of related party transactions include transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners; and (d) affiliates.

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