Notes to Financial Statements [Abstract]
3ed0e638-36ef-11e1-ba93-1231380dc193
Operations by line of business
Segment Reporting Disclosure [Text Block]
Earnings Per Share [Abstract]
Earnings Per Share
Earnings Per Share [Text Block]
Rate regulation
Public Utilities Disclosure [Text Block]
Schedule Of Fair Value Of Financial Assets For Pension And Postretirement Benefits [Table]
Fair value of pension and postretirement plan assets by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets or liabilities (Level 1), Significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).
Defined Benefit Plan, Fair Value of Plan Assets by Measurement [Axis]
Defined Benefit Plan, Fair Value of Plan Assets by Measurement [Axis]
Fair Value Plan Asset Measurement [Domain]
Fair Value Plan Asset Measurement [Domain]
Level 1 [Member]
Fair Value, Inputs, Level 1 [Member]
Level 2 [Member]
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan by Plan Asset Categories [Axis]
Defined Benefit Plan by Plan Asset Categories [Axis]
Plan Asset Categories [Domain]
Plan Asset Categories [Domain]
Domestic equity mutual funds [Member]
Domestic Equity Mutual Funds [Member]
This category includes information about ownership interests or the right to acquire ownership interests in corporations and other legal entities which ownership interest is represented by shares of common or preferred stock (which is neither mandatorily redeemable no redeemable at the option of the holder), convertible securities, stock rights, or stock warrants in U.S. corporations.
Fixed income mutual funds [Member]
Fixed Income Mutual Funds [Member]
An investment that pools funds from many investors to invest in a combination of underlying investments, primarily fixed income mutual fund investments.
Inflation protection mutual funds [Member]
Inflation Protection Mutual Funds [Member]
This category includes mutual funds whose underlying securities and investment strategies are intended to offset the effects of increases in inflation.
Corporate bonds [Member]
Corporate Debt Securities [Member]
U.S. government securities [Member]
US Treasury and Government [Member]
Cash equivalent commingled funds [Member]
Cash Equivalent Funds [Member]
A fund that has underlying investments in short-term money-market instruments, such as commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and other highly liquid and safe securities and pays money market rates of interest.
Domestic equity index commingled funds [Member]
Domestic Equity Index Funds [Member]
An investment that pools funds from many investors to invest in a combination of underlying investments, primarily U.S. equity investments that represent the whole U.S. stock market.
Foreign equity growth commingled funds [Member]
Foreign Equity Growth Funds [Member]
An investment that pools funds from many investors to invest in a combination of underlying investments, primarily foreign growth (emerging) equity investments.
Foreign equity index commingled funds [Member]
Foreign Equity Index Funds [Member]
An investment that pools funds from many investors to invest in a combination of underlying investments, primarily foreign equity investments that represent a defined group of foreign stocks, such as the MSCI EAFE index.
Corporate debt commingled funds [Member]
Fixed Income Funds [Member]
Inflation protection commingled funds [Member]
Inflation Protection Funds [Member]
This category includes commingled funds whose underlying securities and investment strategies are intended to offset the effects of increases in inflation.
Foreign equity growth 103-12 investment entities [Member]
Foreign Equity Growth 103-12 Investment Entities [ Member]
An investment that pools funds from many investors to invest in a combination of underlying investments, primarily foreign growth (emerging) equity investments.
Defined Benefit Plan Disclosure Fair Value [Line Items]
Defined Benefit Plan Disclosure Fair Value [Line Items]
Defined Benefit Plan, Fair Value of Plan Assets
Defined Benefit Plan, Fair Value of Plan Assets
Income Statement [Abstract]
Statement [Table]
Statement [Table]
Legal Entity [Axis]
Entity [Domain]
Questar Pipeline [Member]
Questar Pipeline Company operates interstate natural gas pipelines and storage facilities in the western United States and provides other energy services.
Questar Gas [Member]
Questar Gas Company provides retail natural gas distribution services in Utah, Wyoming and Idaho.
Statement [Line Items]
Statement [Line Items]
REVENUES
Revenues [Abstract]
Questar Gas / Revenues from unaffiliated customers
Gas Domestic Regulated Revenue Distribution
Revenue derived from the regulated (by a federal, state, or local government or agency) distribution of natural gas.
Questar Pipeline / Revenues from unaffiliated customers
Gas Domestic Regulated Revenue Transmission
Revenue derived from the regulated (by a federal, state, or local government or agency) transmission of natural gas.
Wexpro
Natural Gas Production Revenue
Revenues from affiliated companies
Gas Domestic Regulated Revenue Transmission Affiliated Companies
Revenue derived from the regulated (by a federal, state, or local government or agency) transmission of natural gas to affiliated companies.
Revenues from affiliated company
Gas Domestic Regulated Revenue Distribution Affiliated Company
Revenue derived from the regulated (by a federal, state, or local government or agency) distribution of natural gas to an affiliated company.
Total Revenues
Revenues
OPERATING EXPENSES
Operating Expenses [Abstract]
Cost of sales (excluding operating expenses shown separately)
Cost of Goods Sold, Oil and Gas
Cost of natural gas sold
Cost of Goods Sold, Oil and Gas [Abstract]
Cost of natural gas sold / Unaffiliated parties
Cost of Purchased Oil and Gas Unaffiliated Parties
Cost of oil and gas purchased from unaffiliated parties during the reporting period.
Cost of natural gas sold / Affiliated companies
Cost of Purchased Oil and Gas Affiliated Companies
Cost of oil and gas purchased from affiliated companies during the reporting period.
Cost of natural gas sold (excluding operating expenses shown separately)
Cost of Purchased Oil and Gas
Operating and maintenance
Cost of Property Repairs and Maintenance
General and administrative
General and Administrative Expense
Separation costs
Severance Costs
Depreciation, depletion and amortization
Depreciation, Depletion and Amortization, Nonproduction
Depreciation and amortization
Utilities Operating Expense, Depreciation and Amortization
Other taxes
Taxes, Other
Cost of Goods and Services Sold (excluding operating expenses shown separately
Cost of Goods and Services Sold
Total Operating Expenses
Operating Expenses
Net gain from asset sales
Gain (Loss) on Disposition of Assets
Operating Income (loss)
Operating Income (Loss)
Interest and other income
Investment Income, Nonoperating
Income from unconsolidated affiliate
Income (Loss) from Equity Method Investments
Interest expense
Interest Expense
Income From Continuing Operations Before Income Taxes
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Cumulative Effects of Changes in Accounting Principles, Noncontrolling Interest
Income taxes
Income Tax Expense (Benefit)
Income from Continuing Operations
Income (Loss) from Continuing Operations Attributable to Parent
Discontinued operations, net of income taxes
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest
Discontinued operations, noncontrolling interest
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Noncontrolling Interest
Total Discontinued Operations, Net Of Income Taxes
Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent
NET INCOME ATTRIBUTABLE TO QUESTAR
Net Income (Loss) Attributable to Parent
Earnings Per Common Share Attributable To Questar
Basic from continuing operations
Income (Loss) from Continuing Operations, Per Basic Share
Basic from discontinued operations
Income (Loss) from Discontinued Operations, Net of Tax, Per Basic Share
Basic total
Earnings Per Share, Basic
Diluted from continuing operations
Income (Loss) from Continuing Operations, Per Diluted Share
Diluted from discontinued operations
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share
Diluted total
Earnings Per Share, Diluted
Weighted average common shares outstanding
Weighted Average Number of Shares Outstanding, Diluted [Abstract]
Used in basic calculation
Weighted Average Number of Shares Outstanding, Basic
Used in diluted calculation
Weighted Average Number of Shares Outstanding, Diluted
Long-term Purchase Commitment [Table]
Long-term Purchase Commitment [Table]
Legal Entity [Axis]
Entity [Domain]
Wexpro [Member]
Wexpro [Member]
Wexpro Company develops and produces natural gas from cost-of-service reserves for Questar Gas.
Questar Gas [Member]
Long-term Purchase Commitment by Category of Item Purchased [Axis]
Long-term Purchase Commitment by Category of Item Purchased [Axis]
Long-term Purchase Commitment, Category of Item Purchased [Domain]
Long-term Purchase Commitment, Category of Item Purchased [Domain]
Well-drilling commitment [Member]
Well Drilling Commitment Member
Commitments requiring payments for well-drilling services
Gas purchase agreements [Member]
Inventories [Member]
Transportation and underground storage commitments - Related party [Member]
Related Party Transportation And Storage Commitments Member
Commitments requiring yearly payments to related parties for transportation and underground storage services
Transportation and underground storage commitments - Third party [Member]
Third Party Transportation Commitments Member
Commitments requiring yearly payments to third-parties for transportation services
Long-term Purchase Commitment [Line Items]
Minimum gas supply provided by cost-of-service reserves (in hundredths)
Minimum Gas Supply Provided By Cost Of Service Reserves
Minimum percentage of gas supply provided by subsidiary.
Maximum gas supply provided by cost-of-service reserves (in hundredths)
Maximum Gas Supply Provided By Cost Of Service Reserves
Maximum percentage of gas supply provided by subsidiary.
Natural gas purchased under agreements
Natural Gas Purchased Under Agreements
Amount of natural gas bought under previous purchase agreements.
2012
Long Term Purchase Commitment Amount Year One
The aggregate amount of payments due in the first year.
2013
Long Term Purchase Commitment Amount Year Two
The aggregate amount of payments due in the second year.
2014
Long Term Purchase Commitment Amount Year Three
The aggregate amount of payments due in the third year.
2015
Long Term Purchase Commitment Amount Year Four
The aggregate amount of payments due in the fourth year.
2016
Long Term Purchase Commitment Amount Year Five
The aggregate amount of payments due in the fifth year.
Leases [Abstract]
Leases [Abstract]
Expiration date of lease on current headquarters building
Expiration Date of Lease on Current Headquarters Building
Expiration Date of Lease on Current Headquarters Building
Minimum future payments of long-term operating leases for current year
Operating Leases, Future Minimum Payments Due, Current
Rental expense
Operating Leases, Rent Expense
New Headquarters building lease term
New Headquarters Building Lease Term
Lease term of new headquarters building.
Annual initial lease payments for new headquarters building
Annual initial Lease Payments For New Headquarters Building
Annual initial lease payments for new headquarters building being constructed and expected to be treated as capital lease..
Subsidiary plan participation and Employee Investment Plan [Table]
Schedule Of Employee Investment Plans [Table]
This element represents a description of the terms and benefits provided by the employer's defined contribution plans.
Questar Pipeline [Member]
Questar Gas [Member]
Defined Benefit Plans Disclosures, Defined Benefit Plans [Axis]
Defined Benefit Plans Disclosures, Defined Benefit Plans [Axis]
Defined Benefit Plans [Domain]
Defined Benefit Plans [Domain]
Pension Plans, Defined Benefit [Member]
Pension Plans, Defined Benefit [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Other Postretirement Benefit Plans, Defined Benefit [Member]
Subsidiary plan participation and Employee Investment Plan [Line Items]
Employee Investment Plan [Line Items]
Employee Investment Plan [Line Items]
Periodic expense
Defined Benefit Plan, Net Periodic Benefit Cost
Percentage of employer contribution match on employees' pretax purchase of common stock (in hundredths)
Defined Contribution Pension Plan Employer Match Percentage Of Employee Deferred Eligible Earnings Range
This element represents the range of employer match percentage of the employees' eligible earnings that have been deferred.
The maximum percentage of an employees' qualifying earnings used to purchase pre-tax purchases of common stock (in hundredths)
Defined Contribution Pension And Other Postretirement Plans Employee Deferal Percentage Maximum Eligible For Employer Match
This element represents the maximum percentage of eligible earnings that an employee can defer that will receive the employer match contribution.
Yearly contribution expense amount recognized in the current period
Defined Contribution Pension Plan And Other Postretirement Plans Yearly Contribution Expense Recognized During The Peiod
This element represents the dollar value of the employer match on employees' eligible earnings that have been recognized during the period.
Statement of Cash Flows [Abstract]
OPERATING ACTIVITIES
Net Cash Provided by (Used in) Operating Activities [Abstract]
Net income
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest
Discontinued operations, net of income taxes
Adjustments to reconcile net income to net cash provided by operating activities of continuing operations:
Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract]
Depreciation, depletion and amortization
Depreciation, Depletion and Amortization
Depreciation and amortization
Depreciation and amortization expense
The aggregate expense recognized in the current period that allocates the cost of tangible and intangible assets to periods that benefit from use of the assets.
Deferred income taxes
Deferred Income Tax Expense (Benefit)
Share-based compensation
Share-based Compensation
Net (gain) from asset sales
Gain (Loss) on Sale of Property Plant Equipment
(Income) from unconsolidated affiliate
Distributions from unconsolidated affiliate
Equity Method Investment, Dividends or Distributions
Other operating
Adjustments, Noncash Items, to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities, Other
Changes in operating assets and liabilities
Increase (Decrease) in Operating Capital [Abstract]
Accounts receivable
Increase (Decrease) in Accounts Receivable
Inventories
Increase (Decrease) in Inventories
Prepaid expenses
Increase (Decrease) in Prepaid Expense
Accounts payable and accrued expenses
Increase (Decrease) in Accounts Payable and Accrued Liabilities
Interest rate hedge - current liability
Increase (Decrease) in Risk Management Assets and Liabilities
Federal income taxes
Increase (Decrease) in Accrued Income Taxes Payable
Regulatory assets and liabilities
Increase (Decrease) in Regulatory Assets and Liabilities
Other
Increase (Decrease) in Other Operating Liabilities
Net Cash Provided By Operating Activities Of Continuing Operations
Net Cash Provided by (Used in) Operating Activities, Continuing Operations
INVESTING ACTIVITIES
Net Cash Provided by (Used in) Investing Activities [Abstract]
Property, plant and equipment
Payments to Acquire Property, Plant, and Equipment
Unconsolidated affiliate
Payments to Acquire Equity Method Investments
Equity investment in QEP
Advances To Unconsolidated Affiliate
Amount of equity contributed to an affiliate prior to Spinoff. The affiliate is recorded as an equity method investment on the Company's consolidated balance sheets.
Cash used in disposition of assets
Payments for (Proceeds from) Removal Costs
Proceeds from disposition of assets and other
Proceeds from Sale of Productive Assets
Change in notes receivable
Increase (Decrease) in Notes Receivables
Distribution from QEP
Proceeds from Dividends Received
Affiliated-company property, plant and equipment transfers
Payments for (Proceeds from) Productive Assets Affiliated Companies
The net cash inflow (outflow) from transfers, purchases, sales and disposals of property, plant and equipment and other productive assets, including intangibles, to or from affiliated companies.
Other
Payments for (Proceeds from) Other Investing Activities
Net Cash Used In Investing Activities Of Continuing Operations
Net Cash Provided by (Used in) Investing Activities, Continuing Operations
FINANCING ACTIVITIES
Net Cash Provided by (Used in) Financing Activities [Abstract]
Common stock issued
Proceeds from Issuance of Common Stock
Common stock repurchased
Payments for Repurchase of Common Stock
Equity contribution
Proceeds from Contributions from Parent
Long-term debt issued, net of issuance costs
Proceeds from Issuance of Long-term Debt
Long-term debt repaid
Repayments of Long-term Debt
Change in long-term note payable
Proceeds From (Repayments Of) Long Term Notes Payable
-- None. No documentation exists for this element. --
Change in short-term debt
Proceeds from (Repayments of) Short-term Debt
Change in notes payable
Proceeds from (Repayments of) Notes Payable
Change in notes receivable from Questar
Change in notes receivable from parent
The net change during the reporting period of the sum of amounts due within one year (or one business cycle) from notes receivable from the parent company for outstanding loans.
Change in notes payable to Questar
Change in notes payable to parent
The net change during the reporting period in current portion (due within one year or one business cycle) of obligation from parent company as evidenced by formal promissory notes.
Checks outstanding in excess of cash balances
Increase (Decrease) in Outstanding Checks, Financing Activities
Dividends paid
Payments of Dividends
Tax benefits from share-based compensation
Excess Tax Benefit from Share-based Compensation, Financing Activities
Net Cash Provided By (Used in) Financing Activities Of Continuing Operations
Net Cash Provided by (Used in) Financing Activities, Continuing Operations
CASH PROVIDED BY (USED IN) CONTINUING OPERATIONS
Net Cash Provided By (Used In) Continuing Operations
Net change in cash associated with the entity's continuing operations.
Cash provided by operating activities of discontinued operations
Cash Provided by (Used in) Operating Activities, Discontinued Operations
Cash used in investing activities of discontinued operations
Cash Provided by (Used in) Investing Activities, Discontinued Operations
Cash provided by (used in) financing activities of discontinued operations
Cash Provided by (Used in) Financing Activities, Discontinued Operations
Effect of change in cash and cash equivalents of discontinued operations
Net Cash Provided by (Used in) Discontinued Operations
Change in cash and cash equivalents
Cash and Cash Equivalents, Period Increase (Decrease)
Beginning cash and cash equivalents
Cash and Cash Equivalents, at Carrying Value
Ending cash and cash equivalents
Supplemental Disclosure of Cash Paid (Received) During the Year for:
Supplemental Cash Flow Information [Abstract]
Interest
Interest Paid, Net
Income taxes
Income Taxes Paid, Net
Share-based Compensation [Abstract]
Disclosure of Compensation Related Costs, Share-based Payments
Disclosure of Compensation Related Costs, Share-based Payments [Text Block]
Employee benefits
Pension and Other Postretirement Benefits Disclosure [Text Block]
Fair Value, Assets and Liabilities Measured on Recurring Basis [Abstract]
Fair Value Measurements
Fair Value Disclosures [Text Block]
Asset Retirement Obligation [Abstract]
Asset Retirement Obligations By Line Of Business [Table]
A table of asset retirement obligations by line of business.
Questar Pipeline [Member]
Asset Retirement Obligations By Line Of Business [Line Items]
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
ARO liability beginning balance
Asset Retirement Obligations, Noncurrent
Accretion
Asset Retirement Obligation, Accretion Expense
Liabilities incurred
Asset Retirement Obligation, Liabilities Incurred
Revisions
Asset Retirement Obligation, Revision of Estimate
Liabilities settled
Asset Retirement Obligation, Liabilities Settled
ARO liability ending balance
Asset Retirement Obligations By Line Of Business [Abstract]
Asset Retirement Obligations By Line Of Business [Abstract]
Asset Retirement Obligations for the line of business
Net investment base and yearly average rate of return
Net Investment Base And Yearly Average Rate Of Return Text Block
Schedule disclosing annual financial data in the financial statements. The disclosure includes a tabular presentation of financial information for each fiscal year for the current and two previous years and may include revenues, gross profit, investment base rate of return, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data.
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table]
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis]
Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis]
Share-based Compensation Arrangements by Share-based Payment Award, Award Type and Plan Name [Domain]
Share-based Compensation Arrangements by Share-based Payment Award, Award Type and Plan Name [Domain]
Restricted Shares [Member]
Restricted Shares [Member]
Shares of common stock issued that have restrictions as to when they can be sold.
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted share transactions under the terms of the LTSIP [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Unvested restricted shares, beginning balance (recast) (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number
Granted (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period
Distributed (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period
Forfeited (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period
Unvested restricted shares, ending balance (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosures [Roll Forward]
ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsAdditionalDisclosures [Roll Forward]
Minimum price of unvested restricted shares, beginning of period (in dollars per share)
Share Based Compensation Arrangement By Share Based Payment Award Unvested Restricted Shares Minimum Price
The minimum price within a price range of unvested restricted shares.
Maximum price of unvested restricted shares, beginning of the period (in dollars per share)
Share Based Compensation Arrangement By Share Based Payment Award Unvested Restricted Shares Maximum Price
The maximum price within a price range of unvested restricted shares.
Minimum price of unvested restricted shares, granted (in dollars per share)
Share Based Compensation Unvested Restricted Shares Grants In Period Minimum Price
The minimum price at which granted unvested restricted shares are converted into shares under the plan
Maximum price of unvested restricted shares, granted (in dollars per share)
Share Based Compensation Unvested Restricted Shares Grants In Period Maximum Price
The maximum price at which granted unvested restricted shares are converted into shares under the plan
Minimum price of unvested restricted shares, distributed (in dollars per share)
Share Based Compensation Unvested Restricted Shares Vested In Period Minimum Price
The minimum price at which unvested restricted shares are converted into shares and distributed under the plan
Maximum price of unvested restricted shares, distributed (in dollars per share)
Share Based Compensation Unvested Restricted Shares Vested In Period Maximum Price
The maximum price at which unvested restricted shares are converted into shares and distributed under the plan
Minimum price of unvested restricted shares, forfeited (in dollars per share)
Share Based Compensation Unvested Restricted Shares Forfeited In Period Minimum Price
The minimum price at which unvested restricted shares are forfeited under the plan
Maximum price of unvested restricted shares, forfeited (in dollars per share)
Share Based Compensation Unvested Restricted Shares Forfeited In Period Maximum Price
The maximum price at which unvested restricted shares are forfeited under the plan
Minimum price of unvested restricted shares, end of period (in dollars per share)
Maximum price of unvested restricted shares, end of period (in dollars per share)
Weighted-average price, beginning of period (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value
Weighted-average price, restricted shares granted (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value
Weighted-average price, restricted shares distributed (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Weighted Average Grant Date Fair Value
Weighted-average price, restricted shares forfeited (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period, Weighted Average Grant Date Fair Value
Weighted-average price, end of period (in dollars per share)
Vesting period for share-based awards (in months)
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period
Restricted share grants, vesting rights
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights
General Policies [Abstract]
Average depreciation, depletion and amortization rates of the Company's capitalized costs
Average Depreciation Depletion And Amortization Text Block
A schedule of the average depreciation, depletion and amortization rates of the Company's capitalized costs to periods that benefit from use of the assets.
Amounts recorded in the income statement for the capitalization of funds used during construction and interest costs
Amounts Recorded For Capitalization Of Funds Used During Construction And Interest Costs Text Block
A schedule of the average depreciation, depletion and amortization rates of the Company's capitalized costs to periods that benefit from use of the assets.
Components of accumulated comprehensive income (loss) and the respective income taxes allocated
Comprehensive Income Note [Text Block]
Component of Questar Pipeline AOCI and reconciliation of cash flow hedging AOCI
Component of Questar Pipeline AOCI and Reconciliation of AOCI - Cash Flow Hedging [Text Block]
Component of Questar Pipeline AOCI.
Reconciliation of after-tax AOCI related to cash flow hedging activities. Required by ASC 815-30-50.
Capitalized Interest By Legal Entity [Table]
The component of the allowance for funds used during construction during the period comprised of interest on borrowed funds used in financing the construction of regulated assets, detailed by legal entity.
Capitalized Interest by Legal Entity [Line Items]
Capitalized Interest by Legal Entity [Line Items]
Nature of Business [Abstract]
Number Of Business Lines
Number Of Business Lines
Describes the number of lines of business
Principles of Consolidation [Abstract]
Principles Of Consolidation Abstract
Approval date of Reincorporation Merger
Reincorporation Merger Date Of Approval
Month, day and year when the reincorporation merger was approved, and the merger is effective.
Distribution date of tax-free, pro rata dividend to Questar shareholders
Distribution Date Of Capital Stock Of Subsidiaries To Stockholders
Month, day and year when all of the shares of a subsidiaries' common stock held by the company was distributed to the company's shareholders as a tax-free, pro-rata dividend (the Spinoff).
Number of shares of QEP common stock received for each share of Questar common stock
Number Of Shares Of Subsidiary Common Stock Received For Each Share Of Parent Common Stock
Represents the number of shares of subsidiaries' common stock received by each shareholder, for each share of common stock held at the close of business on the record date, including fractional shares.
Equity contribution to QEP prior to Spinoff
Ownership percentage in unconsolidated affiliate (in hundredths)
Equity Method Investment, Ownership Percentage
Revenue Recognition [Abstract]
Revenue Recognition Abstract
After tax rate of return allowed per Wexpro agreement (In hundredths)
After Tax Rate Of Return Allowed Per Agreement
After tax rate of return allowed per Wexpro agreement.
Percentage of operating income retained by Wexpro after expenses (in hundredths)
Percentage Of Operating Income Retention
The percentage of operating income retained by the subsidiary from operations as outlined by agreement.
Rate Adjustment Time Period
Rate Adjustment Time Period
The number of months that rate adjustments occur under the conservation enabling tariff (CET) program.
Deferred CET adjustments amortization period
Deferred Conservation Adjustments Amortization Period
The number of months that the deferred conservation enabling tariff (CET) program rate adjustments are amortized over.
Rate adjustment limitation as a percent of non-gas revenues (In hundredths)
Rate Adjustment Limitation As Percent Of Nongas Revenues
The percentage limitation of adjustments as a percent of non-gas revenues.
Cash and Cash Equivalents [Abstract]
Cash And Cash Equivalents Abstract
Cash Equivalent Maturity Maximum Months
Cash Equivalent Maturity Maximum Months
The maximum number of maturity in months that cash securities are classified as cash.
Contributions-in-aid-of construction [Abstract]
Contributions In Aid Of Construction Abstract
Time period contributions are refundable if other customers pay to connect to the line (in years)
Period Contributions Are Refundable
This element represents the time frame allowable for a refund of the deposit if another customer connects to the pipeline.
Time period if no other customers connect to the line the funds are not refundable (in years)
Period Contributions Expire Without Refund
This element represents that when the time expires without additional plant connections.
Depreciation, depletion and amortization [Abstract]
Depreciation Depletion And Amortization Abstract
Crude Oil To Be Converted To Natural Gas
Crude Oil To Be Converted To Natural Gas
Crude oil to be converted into natural gas equivalents.
Oil Conversion To Natural Gas Cubic Feet
The amount of natural gas equivalents one barrel of crude oil or NGL is converted into.
Cost-of-service gas and oil properties, per Mcfe
Cost Of Service Gas And Oil Properties Avg Depreciation Per Mcfe
Cost of Service gas and oil reserves are accounted for under the successful efforts method while they are being developed and produced. The leasehold costs are depleted by using a unit of production method the estimated proved gas and oil reserves.
Questar Pipeline transportation, storage and other energy services
Transportation Storage And Other Energy Services Avg Depreciation Rate
Major categories of fixed assets in transportation and storage operations are grouped together and depreciated on a straight-line method.
Questar Gas distribution plant
Gas Distribution Plan Avg Depreciation Rate
Major categories of fixed assets such gas distribution plants are grouped together and depreciated on a straight-line method.
Gas Distribution Plant Reduction In Annual Depreciation Expense
Gas Distribution Plant Reduction In Annual Depreciation Expense
Change in depreciation rates will reduce the annual depreciation expense for the gas distribution plant.
Impairment of long-lived assets [Abstract]
Impairment of Long-Lived Assets Held and Used [Abstract]
Total impairment expense
Other Asset Impairment Charges
Capitalized Interest and funds used for construction [Abstract]
Capitalized Interest And Funds Used For Construction [Abstract]
Capitalized Interest And Funds Used For Construction [Abstract]
AFUDC (recorded as an increase in interest and other income)
Public Utilities, Allowance for Funds Used During Construction, Capitalized Cost of Equity
Capitalized interest costs (recorded as a reduction of interest expense)
Public Utilities, Allowance for Funds Used During Construction, Capitalized Interest
Credit Risk [Abstract]
Credit Risk Abstract
Provision for Doubtful Accounts
Reduction in bad-debt expense from the settlement of a revenue dispute previously accrued for in allowance for bad debts
Allowance for Loan and Lease Losses, Recoveries of Bad Debts
Allowance for Doubtful Accounts Receivable
Allowance for Doubtful Accounts Receivable
Time period in months uncollected accounts are written off
Uncollected Accounts Writeoff In Months
Time period in months uncollected accounts are written off after gas is delivered and interest is no longer accrued.
Income Taxes [Abstract]
Income Taxes Abstract
Unrecognized tax benefits
Unrecognized Tax Benefits
Percent of capital expenditures deductible for federal income tax purposes under current statutes (in hundredths)
Percent of Capital Expenditures Deductible for Federal Income Tax Purposes under Current Statutes
Percent of capital expenditures deductible for federal income tax purposes under current statutes, i.e. "bonus depreciation."
Net operating loss (NOL) for federal income tax purposes
Unrealized Tax Benefits Resulting In Net Operating Loss Carryforward
Amount of an unrealized tax benefit that is directly related to a position taken in a tax year that results in a net operating loss carryforward. This amount should be presented as a reduction of the related deferred tax asset in the balance sheet if that deferred tax asset has not been used. This amount is presented separately from the deferred tax asset for a net operating loss carryforward if this unrelated tax benefit is associated with a different tax position.
Expiration date of net operating loss (NOL) for federal income tax purposes
Operating Loss Carryforwards, Expiration Dates
Accumulated other comprehensive loss [Abstract]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Pension liability
Accumulated Other Comprehensive Income Loss Defined Benefit Pension Plans Net Of Tax
The total of net (gain) loss, prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension plan(s) because they have yet to be recognized as components of net periodic benefit cost.
Postretirement benefits liability
Accumulated Other Comprehensive Income Loss Postretirement Benefit Plans Net Of Tax
The total of net (gain) loss, prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with postretirement benefit plan(s) because they have yet to be recognized as components of net periodic benefit cost.
Interest rate cash flow hedges
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax
Long-term investment
Accumulated Other Comprehensive Income Loss Long Term Investments
The total of net (gain) loss, prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with postretirement benefit plan(s) because they have yet to be recognized as components of net periodic benefit cost.
Accumulated other comprehensive loss
Accumulated Other Comprehensive Income (Loss), Net of Tax
Income taxes allocated to each component of other comprehensive income (loss) [Abstract]
Other Comprehensive Income, Defined Benefit Plans, Tax [Abstract]
Pension liability
Other Comprehensive Income Loss Defined Benefit Pension Plans, Tax
This element represents the tax benefit (expense) relating to the recognition of the under-funded position of the pension liability.
Postretirement benefits liability
Other Comprehensive Income Loss Postretirement Benefit Plans, Tax
This element represents the tax benefit (expense) relating to the recognition of the under-funded position of the post retirement benefits
Interest rate cash flow hedges
Other Comprehensive Income, Derivatives Qualifying as Hedges, Tax Effect
Discontinued operations, unrealized gain (loss) on derivatives
Other Comprehensive Income, Unrealized Gain (Loss) on Derivatives Arising During Period, Tax
Income Taxes
Other Comprehensive Income (Loss), Tax
Derivatives used in cash flow hedge, AOCI, net of tax [Roll Forward]
Derivatives used in Cash Flow Hedge, AOCI, Net of Tax [Roll Forward]
Derivatives used in Cash Flow Hedge, AOCI, Net of Tax [Roll Forward]
Interest rate cash flow hedges beginning balance
Net change associated with current period hedging transactions
Other Comprehensive Income, Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax
Net amount reclassified into earnings
Other Comprehensive Income, Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax
Interest rate cash flow hedges ending balance
Discontinued Operations [Abstract]
Discontinued operations
Disposal Groups, Including Discontinued Operations, Disclosure [Text Block]
Asset Retirement Obligation Disclosure
Asset Retirement Obligation Disclosure [Text Block]
Capitalized Cost Of Service Activities By Segment [Table]
Capitalized Cost Of Service Activities By Segment [Table]
Wexpro [Member]
Capitalized Costs Relating To Oil And Gas Producing Activities By Segment [Line Items]
Capitalized Costs Relating To Oil And Gas Producing Activities By Segment [Line Items]
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
Capitalized Costs, Oil and Gas Producing Activities, Net
Capitalized Costs, Oil and Gas Producing Activities, Net
Statement of Financial Position [Abstract]
ASSETS [Abstract]
Assets [Abstract]
Current Assets
Assets, Current [Abstract]
Cash and cash equivalents
Notes receivable
Notes, Loans and Financing Receivable, Net, Current
Notes receivable from Questar
Notes receivable from parent
An amount representing an agreement for an unconditional promise by the parent to pay the subsidiary a definite sum of money at a future date(s) within one year of the balance sheet date or the normal operating cycle, whichever is longer. Such amount may include accrued interest receivable in accordance with the terms of the debt.
Federal income taxes receivable
Income Taxes Receivable, Current
Accounts receivable, net
Accounts Receivable, Net, Current
Unbilled gas accounts receivable
Unbilled Contracts Receivable
Accounts receivable from affiliates
Accounts Receivable, Related Parties, Current
Inventories at lower of average cost or market:
Energy Related Inventory [Abstract]
Gas stored underground
Energy Related Inventory, Gas Stored Underground
Materials and supplies
Other Inventory, Supplies
Current regulatory assets
Regulatory Assets, Current
Prepaid expenses and other
Prepaid Expense, Current
Deferred income taxes - current
Deferred Tax Assets, Net, Current
Current assets of discontinued operations
Assets of Disposal Group, Including Discontinued Operation, Current
Total Current Assets
Assets, Current
Property, Plant and Equipment
Property, Plant and Equipment [Abstract]
Distribution property, plant and equipment
Public Utilities, Property, Plant and Equipment, Distribution
Transportation property, plant and equipment
Public Utilities, Property, Plant and Equipment, Transmission
Cost-of-service gas and oil property, plant and equipment, successful efforts method
Capitalized Costs, Oil and Gas Producing Activities, Gross
Other
Property, Plant and Equipment, Other
Storage
Property, Plant & Equipment, Storage
Property, plant & equipment supporting natural gas storage facilities.
Processing
Property, Plant & Equipment, Processing
Property, plant & equipment dedicated to the processing of natural gas.
General and intangible
Finite-Lived Intangible Assets, Gross
Construction work in progress
Construction in Progress, Gross
Total property, plant and equipment
Property, Plant and Equipment, Gross
Distribution accumulated depreciation and amortization
Distribution Accumulated Depreciation And Amortization
Period end amount of accumulated depreciation and amortization related to utility distribution.
Transportation accumulated depreciation and amortization
Transportation Accumulated Depreciation And Amortization
Period end amount of accumulated depreciation and amortization related to utility transmission.
Cost-of-service gas and oil accumulated depreciation depletion and amortization
Capitalized Costs, Accumulated Depreciation, Depletion, Amortization and Valuation Allowance for Relating to Oil and Gas Producing Activities
Other accumulated depreciation and amortization
Other Accumulated Depreciation And Amortization
This element represents accumulated depreciation and amortization not otherwise defined in the taxonomy
Total accumulated depreciation, depletion and amortization
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment
Property, plant and equipment of discontinued operations, net
Disposal Group, Including Discontinued Operation, Property, Plant, and Equipment, Net
Total Property, Plant and Equipment, net
Property, Plant and Equipment, Net
Investment in unconsolidated affiliate
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures
Other Assets
Other Assets, Noncurrent [Abstract]
Goodwill
Goodwill
Regulatory assets
Regulatory Assets, Noncurrent
Regulatory and other noncurrent assets
Regulatory and other noncurrent assets
The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period. Also includes aggregate carrying amount, as of the balance sheet date, of noncurrent assets not separately disclosed in the balance sheet due to materiality considerations. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).
Other noncurrent assets
Other Assets, Noncurrent
Total Other Assets
Other Assets
TOTAL ASSETS
Assets
LIABILITIES AND COMMON SHAREHOLDERS' EQUITY
Liabilities and Stockholders' Equity [Abstract]
Current Liabilities
Liabilities, Current [Abstract]
Short-term debt
Short-term Borrowings
Notes payable
Notes Payable, Current
Notes payable to Questar
Notes payable to parent
Sum of the carrying values as of the balance sheet date of the portions of long-term notes payable to the parent company, due within one year or the operating cycle if longer.
Accounts payable and accrued expenses
Accounts Payable, Current
Accounts payable to affiliates
Accounts Payable, Related Parties, Current
Production and other taxes
Taxes Payable, Current
Customer advances
Customer Advances, Current
Interest payable
Interest Payable, Current
Current regulatory liabilities
Regulatory Liability, Current
Current portion of long-term debt
Long-term Debt, Current Maturities
Federal income taxes payable
Accrued Income Taxes, Current
Total Current Liabilities
Liabilities, Current
Long-term debt, less current portion
Long-term Debt, Excluding Current Maturities
Deferred income taxes
Deferred Tax Assets (Liabilities), Net, Noncurrent
Asset retirement obligations
Defined benefit pension plan
Defined Benefit Pension Plan, Liabilities, Noncurrent
Other postretirement benefits
Other Postretirement Benefits Payable, Noncurrent
Customer contributions-in-aid-of-construction
Customer Contributions In Aid Of Construction
The amount provided by external customers or affiliates for the use of completing a construction project. This creates a liability upon completion or as stated by agreement.
Regulatory and other noncurrent liabilities
Regulatory and other noncurrent liabilities
The amount for the individual regulatory liability as itemized in a table of regulatory liabilities as of the end of the period. Also, includes the aggregate carrying amount, as of the balance sheet date, of noncurrent obligations not separately disclosed in the balance sheet due to materiality considerations. Noncurrent liabilities are expected to be paid after one year (or the normal operating cycle, if longer).
Noncurrent liabilities of discontinued operations
Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent
Commitments and contingencies - Note 8
Commitments and Contingencies
COMMON SHAREHOLDERS' EQUITY
Stockholders' Equity Attributable to Parent [Abstract]
Common stock
Common Stock, Value, Issued
Additional paid-in capital
Additional Paid in Capital
Retained earnings
Retained Earnings (Accumulated Deficit)
Accumulated other comprehensive (loss)
Total Common Shareholders' Equity
Stockholders' Equity Attributable to Parent
Noncontrolling interest of discontinued operations
Non Controlling Interest Of Discontinued Operations
3ed4f372-36ef-11e1-ba93-1231380dc193
TOTAL LIABILITIES AND COMMON SHAREHOLDERS' EQUITY
Liabilities and Stockholders' Equity
Selected Quarterly Financial Information [Abstract]
Revenues
Operating Income
Income from continuing operations
Discontinued operations, net of income taxes
Net income attributable to Questar
Per share information attributable to Questar
Basic EPS from continuing operations
Basic EPS attributable to Questar
Diluted EPS from continuing operations
Diluted EPS attributable to Questar
Revenues
Disposal Group, Including Discontinued Operation, Revenue
Operating income
Disposal Group, Including Discontinued Operation, Operating Income (Loss)
Discontinued operations, net of income taxes
Total Discontinued Operations, Net Of Income Taxes
Basic from discontinued operations (in dollars per share)
Diluted from discontinued operations (in dollars per share)
Discontinued operations income taxes
Discontinued Operation, Tax Effect of Discontinued Operation
Summary of Significant Accounting Policies
Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block]
Related-Party Transactions [Abstract]
Related-Party Transactions [Abstract]
Related Party Transactions
Related Party Transactions Disclosure [Text Block]
Income taxes
Income Tax Disclosure [Text Block]
Capitalized costs of cost-of-service gas and oil properties net of the related accumulated depreciation and amortization
Capitalized Costs Relating to Oil and Gas Producing Activities Disclosure [Text Block]
Results of operation of cost-of-service gas- and oil-producing activities, before corporate overhead and interest expenses
Results of Operations for Oil and Gas Producing Activities Disclosure [Text Block]
Estimated quantities of cost-of-service proved gas and oil reserves
Schedule of Proved Developed and Undeveloped Oil and Gas Reserve Quantities [Text Block]
Commitments and Contingencies
Commitments and Contingencies Disclosure [Text Block]
Wexpro Agreement
Wexpro Agreement [Text Block]
This element may be used to capture the relationship between Questar and its subsidiary, Wexpro. This relationship is defined in an agreement effective August 1 1981 and set forth the rights of Questar Gas to receive certain benefits from Wexpro's operations.
Schedule of Defined Benefit Plans Disclosures [Table]
Schedule of Defined Benefit Plans Disclosures [Table]
Pension Plans, Defined Benefit, Qualified Only [Member]
Pension Plans, Defined Benefit, Qualified Only [Member]
A defined benefit pension plan is a plan that defines an amount of pension benefit to be provided, usually as a function of one or more factors such as age, years of service, or compensation. Any pension plan that is not a defined contribution pension plan is a defined benefit pension plan.
This item refers only to plans that are qualified under Employee Retirement Income Security Act (ERISA) regulations.
Pension Plans, Defined Benefit, Nonqualified Only [Member]
Pension Plans, Defined Benefit, Nonqualified Only [Member]
A defined benefit pension plan is a plan that defines an amount of pension benefit to be provided, usually as a function of one or more factors such as age, years of service, or compensation. Any pension plan that is not a defined contribution pension plan is a defined benefit pension plan.
This item refers only to plans that are not qualified under Employee Retirement Income Security Act (ERISA) regulations.
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan Disclosure [Line Items]
Disclosures regarding the benefits provided under the plan
Defined Benefit Plans, General Information
Period of time the transition obligation is being amortized over that began in 1992 (in years)
Defined Benefit Plan Amortization Of Net Transition Asset Transition Obligation Years
This element represents the number of years over which the amounts in accumulated other comprehensive income related to transition assets (obligations), originating from the adoption of FAS 87 and 106, are expected to be recognized since the beginning of such amortization in 1992.
Accumulated benefit obligation
Defined Benefit Plan, Accumulated Benefit Obligation
Assumptions used to calculate benefit obligations [Abstract]
Defined Benefit Plan, Weighted Average Assumptions Used in Calculating Benefit Obligation [Abstract]
Discount rate used to calculate benefit obligation (in hundredths)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate
Rate of increase in compensation used to calculate benefit obligation (in hundredths)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase
Long-term return on assets used to calculate benefit obligation (in hundredths)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Expected Long-Term Return on Assets
An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.
Assumed health care cost trend rates used to calculate benefit obligation [Abstract]
Defined Benefit Plan, Assumed Health Care Cost Trend Rates [Abstract]
Health-care inflation rate used to calculate benefit obligation (in hundredths)
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year, Benefit Obligation
The assumed health care cost trend rate for the next year used to measure the accumulated benefit obligation of the plan. This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.
Ultimate health care cost trend rate used to calculate benefit obligation (in hundredths)
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate, Benefit Obligation
The ultimate trend rate for health care costs.
Year that rate reaches ultimate trend rate, used to calculate benefit obligation
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate, Benefit Obligation
The year when the ultimate health care cost trend rate is expected to be reached.
Change in benefit obligation [Roll Forward]
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit obligation - beginning balance
Defined Benefit Plan, Benefit Obligation
Service cost
Defined Benefit Plan, Service Cost
Interest cost
Defined Benefit Plan, Interest Cost
Change in plan assumptions
Defined Benefit Plan, Plan Amendments
Actuarial loss
Defined Benefit Plan, Actuarial Net (Gains) Losses
Curtailment charge
Defined Benefit Plan, Curtailments
Transfer to QEP due to spinoff
Defined Benefit Plan, Divestitures, Benefit Obligation
Benefits paid
Defined Benefit Plan, Benefits Paid
Benefit obligation - ending balance
Change in plan assets [Roll Forward]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets - beginning balance
Actual gain on plan assets
Defined Benefit Plan, Actual Return on Plan Assets
Company contributions to the plan
Defined Benefit Plan, Contributions by Employer
Transfer to QEP due to spinoff
Defined Benefit Plan, Divestitures, Plan Assets
Fair value of plan assets - ending balance
Funded status of plan [Abstract]
Defined Benefit Plan, Funded Status of Plan [Abstract]
Underfunded status (current and long-term)
Defined Benefit Plan, Funded Status of Plan
Projected pension funding in the next fiscal year
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year
Estimated benefit-plan payments for the next five years and subsequent five years aggregated [Abstract]
Defined Benefit Plan, Estimated Future Benefit Payments [Abstract]
2012
Defined Benefit Plan, Expected Future Benefit Payments in Year One
2013
Defined Benefit Plan, Expected Future Benefit Payments in Year Two
2014
Defined Benefit Plan, Expected Future Benefit Payments in Year Three
2015
Defined Benefit Plan, Expected Future Benefit Payments in Year Four
2016
Defined Benefit Plan, Expected Future Benefit Payments in Year Five
2017 through 2021
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter
Components of pension and postretirement benefits expense [Abstract]
Defined Benefit Plan, Net Periodic Benefit Cost [Abstract]
Expected return on plan assets
Defined Benefit Plan, Expected Return on Plan Assets
Prior service and other costs
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)
Recognized net actuarial loss
Defined Benefit Plan, Amortization of Gains (Losses)
Cutailment charges
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments
Special-termination benefits
Defined Benefit Plan, Special Termination Benefits
Accretion of regulatory liability
Defined Benefit Plan Accretion Of Regulatory Liability
A periodic charge recognizing amounts collected in rates in excess of actual postretirement expenses.
Periodic expense
Quarterly financial information
Quarterly Financial Information [Text Block]
Summary of unaudited quarterly financial information
Quarterly Financial Results Text Block
Schedule disclosing quarterly financial data in the annual financial statements. The disclosure includes a tabular presentation of financial information for each fiscal quarter for the current and previous year and may include revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data.
Closing price of Questar stock (in dollars per share)
Common Stock Price Per Share
Price-per-share of common stock issued by the company.
Ratio used to modify the exercise price and the grant-day prices of stock options and restricted share awards, Questar (in hundredths)
Ratio Of Closing Prices Company To Total
The ratio used to modify the exercise price of options and the grant-day prices of restricted shares, to generally preserve the potential benefits under the LTSIP prior to the Spinoff.
Closing price of QEP stock (in dollars per share)
Subsidiary or Equity Method Investee, Price-Per-Share
Ratio used to modify the exercise price and the grant-day prices of stock options and restricted share awards, QEP (in hundredths)
Ratio Of Closing Prices Equity Method Investee To Total
The ratio used to modify the exercise price of options and the grant-day prices of restricted shares, to generally preserve the potential benefits under the LTSIP prior to the Spinoff.
Share-based compensation
Deferred share-based compensation on restricted share awards
Deferred Compensation Liability, Current and Noncurrent
Cash flow from income tax benefits in excess of recognized compensation expense
Shares available for future grant (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant
Major assumptions used in the calculation of fair value of options granted [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]
Fair value of options at grant date (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value
Fair value of options at grant date - minimum range (in dollars per share)
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value Minimum Range
The minimum weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.
Fair value of options at grant date - maximum range (in dollars per share)
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value Maximum Range
The maximum weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.
Risk-free interest rate (in hundredths)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate
Risk-free interest rate - minimum range (in hundredths)
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Minimum Range
The minimum risk-free interest rate assumption that is used in valuing an option on its own shares.
Risk-free interest rate - maximum range (in hundredths)
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate Maximum Range
The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.
Expected price volatility (in hundredths)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate
Expected price volatility - minimum range (in hundredths)
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Minimum Range
The estimated measure of the minimum percentage amount by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.
Expected price volatility - maximum range (in hundredths)
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate Maximum Range
The estimated maximum measure of the minimum percentage amount by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.
Expected dividend yield (in hundredths)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate
Expected dividend yield - minimum range (in hundredths)
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Minimum Range
The estimated minimum dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.
Expected dividend yield - maximum range (in hundredths)
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate Maximum Range
The estimated maximum dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.
Expected life (in years)
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term
Expected life - minimum range (in years)
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term Minimum Range
The minimum period of time a share-based award is expected to be outstanding. A share-based award's expected term shall be determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. An entity is required to aggregate individual awards into relatively homogeneous groups.
Expected life - maximum range (in years)
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Term Maximum Range
The maximum period of time a share-based award is expected to be outstanding. A share-based award's expected term shall be determined based on, among other factors, the instrument's contractual term and the effects of employees' expected exercise and post-vesting employment termination behavior. An entity is required to aggregate individual awards into relatively homogeneous groups.
Disclosure of fair value and related carrying amount of certain financial instruments [Table]
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis]
Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis]
Fair Value, Disclosure Item Amounts [Domain]
Fair Value, Disclosure Item Amounts [Domain]
Carrying Amount [Member]
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Estimated Fair Value [Member]
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value Assets and Liabilities Measured on Recurring Basis Disclosure Items [Axis]
Fair Value Assets and Liabilities Measured on Recurring Basis Disclosure Items [Axis]
This element represents a number of concepts which are required or desirable disclosure items concerning assets and liabilities, including [financial] instruments that are classified in stockholders' equity, which are measured at fair value on a recurring.
Fair Value Assets and Liabilities Measured on Recurring Basis Disclosure Items [Domain]
Fair Value Assets and Liabilities Measured on Recurring Basis Disclosure Items [Domain]
Provides the general information items required or determined to be disclosed with respect to assets and liabilities, including [financial] instruments that are classified in stockholders' equity, which are measured at fair value on a recurring basis.
Fair Value, Inputs, Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financial assets [Abstract]
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Cash and cash equivalents
Cash and Cash Equivalents, Fair Value Disclosure
Notes receivable from Questar
Notes Receivable Affiliated Fair Value Disclosure
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. An amount representing an agreement for an unconditional promise by the maker to pay the affiliated Company (holder) a definite sum of money at a future date(s).
Long-term investment
Investments, Fair Value Disclosure
Financial liabilities [Abstract]
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]
Short-term debt
Short Term Debt Fair Value Disclosure
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. This item represents short-term debt as of the balance sheet date.
Notes payable to Questar
Notes Payable Affiliated Fair Value Disclosure
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents affiliated notes payable as of the balance sheet date.
Long-term debt, including current portion
Long-term debt, including current portion Fair Value Disclosure
This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. This item represents short-term debt as of the balance sheet date.
Entities [Table]
Entities [Table]
Components of income tax expense
Components Of Income Tax Expense Text Block
This element includes the components of income tax expense on continuing operations, including current and deferred income taxes.
Difference between statutory federal income tax rate and the Company's effective income tax rate
Difference Between Statutory Federal Income Tax Rate And The Effective Income Tax Rate Text Block
Reconciliation between the Company's effective rate of the actual provision for income taxes on continuing operations and that computed by applying the federal statutory rate to income from continuing operations before income taxes.
Significant components of deferred income taxes
Significant Components Of Deferred Income Taxes Text Block
This element includes the components of deferred tax assets and liabilities.
Debt
Debt Disclosure [Text Block]
Schedule Of Weighted Average Number Of Shares Basic And Diluted
Schedule Of Weighted Average Number Of Shares Basic And Diluted [Text Block]
Schedule of the reconciliation of the components of basic and diluted shares used in the earnings per share calculation.
Details of regulatory assets and liabilities
Schedule Of Regulatory Assets Liabilities Text Block
Detailed information about assets and liabilities caused by a regulation. Assets are created when regulatory agencies permit public utilities to defer certain costs included in rate-setting to the balance sheet, which is reported as a single block of text. Rate actions of a regulator can impose a liability on a regulated enterprise resulting in a regulatory liability.
Oil and Gas Exploration and Production Industries Disclosures
Oil and Gas Exploration and Production Industries Disclosures [Text Block]
Summary of Derivative Instruments [Abstract]
Derivative Instruments and Hedging Activities Disclosure
Derivative Instruments and Hedging Activities Disclosure [Text Block]
Proved Developed and Undeveloped Oil and Gas Reserve Quantities [Table]
Proved Developed and Undeveloped Oil and Gas Reserve Quantities [Table]
Reserve Quantities by Type of Reserve [Axis]
Reserve Quantities by Type of Reserve [Axis]
Type of Reserve [Domain]
Type of Reserve [Domain]
Natural Gas (in Bcf) [Member]
Natural Gas Reserves [Member]
Oil and NGL (in MMbbl) [Member]
Oil Reserves [Member]
Natural Gas Equivalents (in Bcfe) [Member]
Natural Gas Equivalent Reserves [Member]
Reserves of natural gas and crude oil, including condensate represented in equivalent volumes of natural gas.
Reserve Quantities [Line Items]
Reserve Quantities [Line Items]
Number of years for development plan
Number Of Years For Development Plan
The number of years established by the compnay for the development plan outlined.
Percent of prior year-end proved undeveloped reserves converted to developed status
Percent of prior year-end proved undeveloped reserves converted to developed status
Percent of prior year-end proved undeveloped reserves converted to developed status
Increase (Decrease) in Proved Developed and Undeveloped Reserves [Roll Forward]
Increase (Decrease) in Proved Developed and Undeveloped Reserves [Roll Forward]
Proved Reserves Abstract
Proved Reserves Abstract
3df526f2-36ef-11e1-ba93-1231380dc193
Beginning balance
Proved Developed and Undeveloped Reserves, Net
Revisions - previous estimates
Proved Developed and Undeveloped Reserves, Revisions of Previous Estimates Increase (Decrease)
Extensions and discoveries
Proved Developed and Undeveloped Reserves, Extensions, Discoveries, and Additions
Production
Proved Developed and Undeveloped Reserves, Production
Ending balance
Proved Developed Reserves Abstract
Proved Developed Reserves Abstract
3ee30156-36ef-11e1-ba93-1231380dc193
Proved Developed Reserves (Volume)
Proved Developed Reserves (Volume)
Proved Undeveloped Reserves Abstract
Proved Undeveloped Reserves Abstract
3e0f919a-36ef-11e1-ba93-1231380dc193
Proved Undeveloped Reserves (Volume)
Proved Undeveloped Reserves (Volume)
Schedule Of Regulatory Assets Liabilities [Table]
A table of assets and liabilities that are created when regulatory agencies permit public utilities to defer certain costs that are included in rate-setting to the balance sheet.
Regulatory Assets Liabilities [Axis]
The list of the regulatory assets and liabilities itemized in a table by current or nocurrent items .
Regulatory Assets Liabilities [Domain]
The name of the regulatory assets and liabilities itemized in a table.
Gas imbalance [Member]
Gas Imbalance Asset Liability Member
The value of gas imbalance asset or liability as of the end of the period.
Revenue sharing [Member]
Revenue Sharing Member
Discloses the amount of regulatory assets and liabilities related to revenue sharing.
Cost of reacquired debt [Member]
Loss on Reacquired Debt [Member]
Income taxes recoverable from customers [Member]
Deferred Income Tax Charges [Member]
Other [Member]
Other [Member]
Postretirement medical [Member]
Postretirement Benefit Costs [Member]
DSM [Member]
Asset Recoverable Gas Costs [Member]
Purchased-gas adjustment [Member]
Purchased Gas Adjustment Member
Purchased gas costs that are different from those provided for in present rates are accumulated and recovered in future rate changes
Deferred production taxes [Member]
Deferred Production Taxes Member
Carrying amount as of the balance sheet date of production taxes on cost-of-service gas production of a regulated entity that are recoverable through future rate adjustments within one year of the balance sheet date or the normal operating cycle, if longer.
Pipeline integrity costs [Member]
Pipeline Integrity Costs Member
Pipeline-integrity regulations are recovered in rates subject to a PSCU order.
ARO cost-of-service gas wells [Member]
Asset Retirement Obligation Costs [Member]
Conservation enabling tariff [Member]
Conservation Enabling Tariff Member
A tariff that was established for conversation efforts.
Regulatory Asset Liabilities [Line Items]
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
Noncurrent regulatory assets
Noncurrent Regulatory Liabilities
Regulatory Liability, Noncurrent
Weighted-average life of reacquired debt
Weighted Average Life Of Reacquired Debt
The weighted-average life for reacquired debt which is deferred and amortized.
Amount of allowed yearly recover through pipeline integrity regulations
Amount Of Allowed Yearly Recover Through Pipeline Integrity Regulations
The limit of costs that can be recovered yearly under pipeline-integrity conditions. These costs are a from a regulatory asset that are expected to be recoverable through rate adjustments after one year (or beyond the operating cycle if longer).
Regulatory asset amortization period
Regulatory Noncurrent Asset, Amortization Period
Recording period for production taxes on cost-of-service gas production
Recording Period For Production Taxes On Cost Of Service Gas Production
The length of time in which production taxes on cost-of-service gas production are recorded. It is based on the time period between gas production and recovery from customers when taxes are paid.
Rate Changes [Abstract]
Public Utilities, General Disclosures [Abstract]
Original authorized return on equity in Utah
Original Authorized Return On Equity In Utah
Percentage of return equity allowed by the state of Utah for the filed rate case before changes.
Current authorized return on equity in Utah
Current Authorized Return On Equity In Utah
Percentage of return equity allowed by the state of Utah for the filed rate case after appeal process.
Amount of increase in customer rates in Utah
Amount Of Increase In Rates In Utah
The amount of increase in rates allowed for by the state of Utah.
Amount of requested increase in customer rates in Wyoming
Amount Of Requested Increase In Rates In Wyoming
The amount of requested increase in rates allowed for by the state of Wyoming under the rate case filed in November 2011.
Requested return on equity in Wyoming
Requested Return On Equity In Wyoming
Requested percentage of return equity allowed by the state of Wyoming for the rate case filed in November 2011.
Major provisions of Agreement [Table]
Major Provisions Of Agreement [Table]
A table or schedule providing information of major provisions pertaining to the agreement.
Major provisions of Agreement [Axis]
Major Provisions Of Agreement [Axis]
Information about each of the major financial provisions of the agreement.
Major provisions of Agreement [Domain]
Major Provisions Of Agreement Domain
Agreement information, such as after tax rate of return, percentage retention, and income sharing amounts.
Gas-development drilling [Member]
Gas Development Drilling Member
Gas-development drilling operations with produced gas being delivered to Questar Gas.
Natural Gas operations [Member]
Natural Gas Operations Member
Natural gas operations from certain properties for Questar Gas.
Developmental Oil Drilling [Member]
Developmental Oil Drilling Member
Development oil drilling operations on productive oil properties.
Crude Oil Production [Member]
Crude Oil Production Member
Crude oil production operations from certain properties.
Agreement [Line Items]
Agreement [Line Items]
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
Percentage of Wexpro after tax rate of return (in hundredths)
Percentage Of After Tax Rate Of Return
The percentage of after-tax return allowed to subsidiary from operations as outlined by the agreement.
Percentage of Wexpro retention (in hundredths)
Percentage of Questar Gas retention (in hundredths)
Percentage Of Operating Income Retention Gas
The percentage of operating income retained by subsidiary from operations as outlined by agreement that are other than Wexpro.
Oil Income Sharing Amounts Per Agreement
Oil Income Sharing Amounts Per Agreement
The amount of operating income received by subsidiary from operations as outlined by the agreement.
Wexpro's net investment base (in millions)
Net Investment Base
Net investment base of the subsidiary.
Average annual rate of return (after tax) (in hundredths)
Average Annual Rate Of Return After Tax
The after tax average rate of return from operations under the agreement.
Summary of continuing operations by line of business
Schedule of Segment Reporting Information, by Segment [Text Block]
Schedule of pension and other postretirement benefit plan asset allocation
Schedule Of Defined Benefit Plan Asset Allocation [Text Block]
Schedule Of Defined Benefit Plan Asset Allocation [Text Block]
Pension and postretirement benefit assets fair value by level
Schedule Of Fair Value Of Financial Assets For Pension And Postretirement Benefits Text Block
Fair value of plan assets by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets or liabilities (Level 1), Significant other observable inputs (Level 2), and significant unobservable inputs (Level 3).
Assumptions used to calculate benefit obligations
Schedules of Assumptions Used To Calculate Benefit Obligations [Text Block]
Schedules of Assumptions Used To Calculate Benefit Obligations [Text Block]
Changes in benefit obligation, changes in fair value of plan assets, and underfunded status
Schedule of Changes in Benefit Obligation, Fair Value of Plan Assets and Underfunded Balance [Text Block]
Schedule of Changes in Benefit Obligation, Fair Value of Plan Assets and Underfunded Status [Text Block]
Estimated benefit plan payments for the next five years and the subsequent five years aggregated
Schedule of Estimated Benefit Plan Payments For The Next Five Years And The Subsequent Five Years Aggregated [Text Block]
Schedule of Estimated Benefit Plan Payments For The Next Five Years [Text Block]
Pension and other postretirement benefits expense components
Schedule Of Pension and Other Postretirement Benefits Expense Components [Text Block]
Schedule Of Pension and Other Postretirement Benefit Expense Components [Text Block]
Assumptions used to calculate benefits expense
Schedule Of Assumptions Used To Calculate Benefits Expense [Text Block]
Schedule Of Assumptions Used To Calculate Benefits Expense [Text Block]
Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table]
Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table]
Derivative Instruments, Gain (Loss) by Hedging Relationship [Axis]
Derivative Instruments, Gain (Loss) by Hedging Relationship [Axis]
Hedging Relationship [Domain]
Hedging Relationship [Domain]
Fair Value Hedging [Member]
Fair Value Hedging [Member]
Cash Flow Hedging [Member]
Derivative Instruments, Gain (Loss) by Derivative Instrument Risk [Axis]
Derivative Instruments, Gain (Loss) by Derivative Instrument Risk [Axis]
Derivative Contract Type [Domain]
Derivative Contract Type [Domain]
Interest Rate Derivative Instrument [Member]
Interest Rate Derivative Instruments [Member]
A forward-based contract in which two parties agree to swap streams of payments over a specified period. The payment streams are based on an agreed-upon (or notional) principal amount. The term notional is used because swap contracts generally involve no exchange of principal at either inception or maturity. Rather, the notional amount serves as a basis for calculation of the payment streams to be exchanged.
Notes Due 2016, 2.75% [Member]
Notes Due 2016, 2.75% [Member]
A forward-based contract in which two parties agree to swap streams of payments over a specified period. The payment streams are based on an agreed-upon (or notional) principal amount. The term notional is used because swap contracts generally involve no exchange of principal at either inception or maturity. Rather, the notional amount serves as a basis for calculation of the payment streams to be exchanged.
Derivative Instruments, Gain (Loss) by Income Statement Location [Axis]
Derivative Instruments, Gain (Loss) by Income Statement Location [Axis]
Income Statement and Other Comprehensive Income Location [Domain]
Income Statement and Other Comprehensive Income Location [Domain]
Other Comprehensive Income [Member]
Interest Expense [Member]
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Derivative Instruments, Gain (Loss) [Line Items]
Realized and unrealized gain
Derivative Instruments, Gain (Loss) Recognized in Income, Net
Unrealized loss
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge
Deferrals of effective portions
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income, Effective Portion, Net
Losses reclassified from AOCI into earnings for effective portions
Cash Flow Hedge Gain (Loss) Reclassified to Earnings, Net
Changes in ARO
Changes In A R O Text Block
A rollforward of the asset retirement obligation (ARO) liability for the period.
Asset Retirement Obligations by line of business
Asset Retirement Obligations By Line Of Business Text Block
Asset Retirement Obligations by line of business at the end of each period presented
Derivative instruments on Consolidated Statements of Income and Accumulated Other Comprehensive Income
Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Text Block]
Derivative instruments in Condensed Consolidated Balance Sheets
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Text Block]
Information about derivative instruments
Schedule of Derivative Instruments [Text Block]
Restricted Stock Units [Member]
Restricted Stock Units [Member]
Shares of stock for which sale is contractrally or governmentally restricted for a given period of time.
Performance Shares [Member]
Performance Shares [Member]
Other than option units awarded based on certain performance goals as an incentive to remain with the company.
Restricted stock unit grants, vesting rights
Number of restricted stock units issued (in shares)
Number Of Restricted Stock Units Issued
The number of restricted stock units issued during the period.
Weighted-average price of restricted stock units issued (in dollars per share)
Weighted Average Price Of Restricted Stock Units Issued
The weighted average fair value at grant for nonvested restricted stock units issued during the period.
Weighted-average vesting period of restricted stock units issued (in months)
Weighted Average Vesting Period Of Restricted Stock Units Issued
Description of the period of time over which an employee's right to exercise a restricted stock unit award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).
Number of unvested restricted shares awarded as result of spinoff and bifurcation of share-based awards (in shares)
Share Based Compensation Arrangement By Share Based Payment Award Unvested Restricted Shares Related To Spinoff And Bifurcation Of Awards
The number of outstanding unvested restricted shares for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares. Granted to certain officers, employees and non-employee directors of the Company as a result of the Spinoff and bifurcation of share-based awards.
Weighted-average price per share of unvested restricted shares awarded as result of spinoff and bifurcation of share-based awards (in dollars per share)
Share Based Compensation Arrangement By Share Based Payment Award Unvested Restricted Shares Weighted Average Grant Date Fair Value Related To Spinoff And Bifurcation Of Awards
The weighted average fair value of unvested restricted shares for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares. Granted to certain officers, employees and non-employee directors of the Company as a result of the Spinoff and bifurcation of share-based awards.
Number of unvested stock options awarded as result of spinoff and bifurcation of share-based awards (in shares)
Share Based Compensation Arrangement By Share Based Payment Award Options Nonvested Number Related To Spinoff And Bifurcation Of Awards
The number of outstanding awards on stock option plans for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares. Granted to certain officers, employees and non-employee directors of the Company as a result of the Spinoff and bifurcation of share-based awards.
Weighted-average price per share of unvested stock options awarded as result of spinoff and bifurcation of share-based awards (in dollars per share)
Share Based Compensation Arrangement By Share Based Payment Award Options Nonvested Weighted Average Exercise Price Related To Spinoff And Bifurcation Of Awards
As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are nonvested. Granted to certain officers, employees and non-employee directors of the Company as a result of the Spinoff and bifurcation of share-based awards.
Number of stock options held by certain officers, employees and nonemployee directors of QEP (in shares)
Share Based Compensation Arrangement By Share Based Payment Award Options Awarded To Equity Method Investee
The number of shares reserved for issuance under stock option agreements awarded under the plan, to officers, employees and nonemployee directors of the equity method investee, that validly exist and are outstanding as of the balance-sheet date, including vested options.
Weighted-average exercise price of stock options awarded to certain officers, employees and nonemployee directors of QEP (in dollars per share)
Share Based Compensation Arrangement By Share Based Payment Award Weighted Average Exercise Price Options Awarded To Equity Method Investee
The weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. These grantees are certain officers, employees and nonemployee directors of the equity method investee.
Weighted-average remaining life of stock options held by certain officers, employees and nonemployee directors of QEP (in years)
Share Based Compensation Arrangement By Share Based Payment Award Weighted Average Remaining Life Options Awarded To Equity Method Investee
The weighted-average period remaining as of the balance-sheet date until option expiration pertaining to the outstanding stock options awarded to certain officers, employees and nonemployee directors of the equity method investee, which may be expressed in a variety of ways (for example, years, months).
Number of unvested restricted shares held by certain officers, employees and nonemployee directors of QEP (in shares)
Share Based Compensation Arrangement By Share Based Payment Award Unvested Restricted Shares Awarded To Equity Method Investee
The number of unvested restricted shares awarded under the plan, to officers, employees and nonemployee directors of the equity method investee, that validly exist and are outstanding as of the balance-sheet date.
Weighted-average price of unvested restricted shares held by certain officers, employees and nonemployee directors of QEP (in dollars per share)
Share Based Compensation Arrangement By Share Based Payment Award Unvested Restricted Shares Weighted Average Grant Date Fair Value
The weighted average fair value of unvested restricted shares for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares, awarded to officers, employees and nonemployee directors of the equity method investee.
Number of shares granted under award plan (in shares)
Performance period (in years) that the target number of performance shares for each exectutive officer is subject to adjustment based on the companys performance
Share Based Compensation Arrangement By Share Based Payment Award Number Of Years Of Award Is Subject To Adjustment
The number of years the target number of performance shares for each executive officer is subject to adjustment upward or downward based on the company's performance with respect to specified performance criteria relative to a specified peer group of companies.
End date of performance share performance period
End date of performance share performance period
End date of performance share performance period
The date actual performance shares awarded will be distributed
The date the share based award will be distributed
The time period in which the shares awarded will be distributed as long as such executive officer was employed by the company or its affiliates.
Grant date fair value of the award
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost
Total unrecognized compensation cost related to all share-based award types
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized
Weighted-average period of recognition for total unrecognized compensation cost (in months)
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table]
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table]
Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Axis]
Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Axis]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Domain]
Options Outstanding Exercise Price Range 1 [Member]
This element represents exercise price range 1 of options outstanding at the end of period.
Options Outstanding Exercise Price Range 2 [Member]
This element represents exercise price range 2 of options outstanding at the end of period.
Options Outstanding Exercise Price Range 3 [Member]
This element represents exercise price range 3 of options outstanding at the end of period.
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Unvested stock options decrease in period (in shares)
Share Based Compensation Arrangement By Share Based Payment Award Options Vested In Period
The decrease in the number of unvested stock options, or conversely, the number of stock options vested during the period.
Stock-option transactions under the terms of the LTSIP [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Options outstanding, beginning balance (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number
Granted (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period
Exercised (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period
Forfeited (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period
Options outstanding, ending balance (in shares)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Minimum exercise price of options outstanding, beginning of period (in dollars per share)
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Minimum Exercise Price
The minimum exercise price within a price range of options outstanding.
Maximum exercise price of options outstanding, beginning of the period (in dollars per share)
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Maximum Exercise Price
The maximum exercise price within a price range of options outstanding.
Minimum exercise price of options granted during the period (in dollars per share)
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Minimum Exercise Price
The minimum exercise price of options granted during the reporting period
Maximum exercise price of options granted during the period (in dollars per share)
Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Maximum Exercise Price
The maximum exercise price of options granted during the reporting period
Minimum exercise price of options exercised during the period (in dollars per share)
Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Minimum Exercise Price
The minimum exercise price of options exercised during the reporting period
Maximum exercise price of options exercised during the period (in dollars per share)
Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Maximum Exercise Price
The maximum exercise price of options exercised during the reporting period
Minimum exercise price of options outstanding, end of period (in dollars per share)
Maximum exercise price of options outstanding, end of period (in dollars per share)
Weighted-average exercise price, options outstanding, beginning of period (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price
Weighted average exercise price of options exercised during the period (in dollars per share)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price
Weighted-average exercise price, options outstanding, end of period (in dollars per share)
Weighted-average remaining term (in years)
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Outstanding Options, Weighted Average Remaining Contractual Term
Number of exercisable options at end of period
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Exercisable Options
Weighted-average exercise price, options exercisable
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price
Number of unvested options at end of period
Share Based Compensation Arrangement By Share Based Payment Award Options Nonvested Number
The number of outstanding awards on stock option plans for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares.
Weighted-average exercise price, unvested options
Share Based Compensation Arrangement By Share Based Payment Award Options Nonvested Weighted Average Exercise Price
As of the balance sheet date, the weighted-average exercise price for outstanding stock options that are nonvested.
Maturities of Long-term Debt Table
Maturities of Long-term Debt [Table]
-- None. No documentation exists for this element. --
Questar Corp [Member]
Questar Corp [Member]
[Parent Company] Questar Corporation (Questar or the Company) is a Rockies-based integrated natural gas company.
Debt Maturities [Line Items]
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
Number of years of long-term debt maturities
Number Of Years Of Long Term Debt Maturities
This is the number of years that are being disclosed for long-term debt maturities beginning with the current year.
Maturities of Long-term Debt [Abstract]
Maturities of Long-term Debt [Abstract]
2012
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months
2013
Long-term Debt, Maturities, Repayments of Principal in Year Two
2014
Long-term Debt, Maturities, Repayments of Principal in Year Three
2015
Long-term Debt, Maturities, Repayments of Principal in Year Four
2016
Long-term Debt, Maturities, Repayments of Principal in Year Five
Derivative [Table]
Derivative [Table]
Cash Flow Hedging [Member]
Derivative, by Nature [Axis]
Derivative, by Nature [Axis]
Derivative, Name [Domain]
Derivative, Name [Domain]
Interest Rate Swap [Member]
Forward Starting Interest Rate Swaps Terminating October 2011 [Member]
An agreement to exchange two different, defined streams of interest beginning on a specified date in the future.
Forward Starting Interest Rate Swap Terminating December 2011 [Member]
An agreement to exchange two different, defined streams of interest beginning on a specified date in the future.
Forward Starting Interest Rate Swaps Terminating Q4 2011 [Member]
An agreement to exchange two different, defined streams of interest beginning on a specified date in the future.
Derivative [Line Items]
Derivative [Line Items]
Notional amount
Derivative, Notional Amount
Weighted-average fixed interest rate (in hundredths)
Derivative, Average Fixed Interest Rate
Debt Instrument, Face Amount
Debt Instrument, Face Amount
Maturity date
Maturity date derivative
The date the derivative matures.
Interest payment for terminated derivative instrument
Interest payment for terminated swaps
Interest payment due to decline in fixed interest rate on fixed-rate debt.
Ineffectiveness recognized on the fair value hedge
Gain (Loss) on Fair Value Hedge Ineffectiveness, Net
Interest rate cash flow hedge ineffectiveness is immaterial
Interest Rate Cash Flow Hedge Ineffectiveness is Immaterial
Pre-tax net losses (gain) expected to be reclassified from AOCI to Consolidated statement of income
Pre-tax net losses (gain) expected to be reclassified from AOCI to Consolidated statement of income
The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.
Reclassification from accumulated OCI to income, estimated time to transfer (in months)
Reclassification from accumulated OCI to income, estimated time to transfer
The time period estimated for the anticipated transfer of gains (losses), net from accumulated other comprehensive income into earnings.
Life of long-term debt associated with cash flow hedges
Life of Long-Term Debt Associated with Cash Flow Hedges
Life of Long-Term Debt Associated with Cash Flow Hedges (in years)
Date through which reclassifications into earnings from AOCI will take place
Date Through Which Reclassifications Into Earnings From AOCI Will Take Place
Date Through Which Reclassifications Into Earnings From AOCI Will Take Place
Results of Operations for Cost-of-Service Oil and Gas Producing Activities [Table]
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Table]
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Axis]
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Axis]
Geographic Area for Oil and Gas Disclosures [Domain]
Geographic Area for Oil and Gas Disclosures [Domain]
Results of Operations for Cost-of-Service Oil and Gas Producing Activities [Line Items]
Results of Operations for Oil and Gas Producing Activities, by Geographic Area [Line Items]
Cost incurred for cost-of-service gas and oil producing activities
Costs Incurred, Development Costs
Cost incurred to develop proved undeveloped reserves
Costs Incurred Development Costs Proved Undeveloped Reserves
Development costs incurred in oil and gas activities of proved undeveloped reserves.
Results of Operations, Oil and Gas Producing Activities Net Income (Excluding Corporate Overhead and Interest Costs) [Abstract]
Results of Operations, Oil and Gas Producing Activities Net Income (Excluding Corporate Overhead and Interest Costs) [Abstract]
Revenues [Abstract]
Results of Operations, Revenue from Oil and Gas Producing Activities [Abstract]
From unaffiliated customers
Results of Operations, Sales Revenue to Unaffiliated Enterprises
From affiliated company
Results of Operations, Sales or Transfers to Entity's Other Operations
Total revenues
Results of Operations, Revenue from Oil and Gas Producing Activities
Production costs
Results of Operations, Production or Lifting Costs
Depreciation, depletion and amortization
Results of Operations, Depreciation, Depletion and Amortization, and Valuation Provisions
Total expenses
Results of Operations, Total Expenses
Total expenses related to gas- and oil-producing activities, excluding income taxes
Revenues less expenses
Results of Operations, Income before Income Taxes
Income Taxes
Results of Operations, Income Tax Expense
Results of operations for cost-of-service gas- and oil-producing activities excluding corporate overhead and interest expenses
Results of Operations, Oil and Gas Producing Activities Net Income (Excluding Corporate Overhead and Interest Costs)
Reimbursement of general and administrative expenses from Questar Gas
Revenues Includes Reimbursement Of General And Administrative Expenses
Additional disclosure of what is included in the line item "Revenues" which includes reimbursement of general and administrative expenses from another line of business.
Schedule Of Debt [Table]
A table or schedule providing information pertaining to debt instruments or arrangements, including identification, terms, features, collateral requirements and other information necessary to a fair presentation.
Questar Corp [Member]
Debt, Type [Axis]
Debt Type [Axis]
Pertinent information about each debt arrangement including the carrying amount as of the balance sheet date, by type of debt.
Debt Type [Domain]
Type of debt arrangement, such as notes, line of credit, commercial paper, asset-based financing, project financing, letter of credit financing.
Revolving credit arrangement [Member]
Line of Credit [Member]
Commercial paper [Member]
Commercial Paper [Member]
Notes payable to Questar [Member]
Notes Payable to Parent [Member]
Notes Payable to Parent [Member]
2.75% Notes due 2016 [Member]
Questar Corp 2.75% Notes Due 2016 Member
A written promise to pay a note to a third party that have a maturity date of February 2016 and interest rate of 2.75%.
6.45% and 6.48% Medium-term Notes due 2015 and 2018 [Member]
Questar Pipeline Medium-Term Notes Due 2015 and 2018 Member
Debt instruments with maturities ranging from 2015 to 2018 that have an interest rate between 6.45% and 6.48%.
6.57% and 7.09% Medium-term Notes due 2011 [Member]
Questar Pipeline Medium-Term Notes Due 2011 [Member]
Debt instruments with maturities in 2011 that have an interest rate between 6.57% and 7.09%.
5.83% Notes due 2018 [Member]
Questar Pipeline 5.83% Notes Due 2018 Member
A written promise to pay a note to a third party that have a maturity date in 2018 and are at 5.83%.
4.875% Notes due 2041 [Member]
Questar Pipeline 4.875% notes due 2041 [Member]
Questar Pipeline 4.875% notes due 2041 [Member]
5.00% to 6.91% Medium-term Notes due 2012 to 2018 [Member]
Questar Gas Medium Term-Notes Due 2012 to 2018 Member
Debt instruments with maturities ranging from 2012 to 2018 that have an interest rate between 5.00% and 6.91%.
6.89% Medium-term Notes due 2011 [Member]
Questar Gas Medium-Term Notes Due 2011 [Member]
Debt instruments with maturities in 2011 that have an interest rate of 6.89%.
6.30% notes due 2018 [Member]
Questar Gas 6.30% Notes Due 2018 Member
A written promise to pay a note to a third party that have a maturity date in 2018 and are at 6.30%.
7.20% notes due 2038 [Member]
Questar Gas 7.20% Notes Due 2038 Member
A written promise to pay a note to a third party that have a maturity date in 2038 and are at 7.20%.
Questar Pipeline 7.09% Medium-Term Notes Due 2011 [Member]
Questar Pipeline 7.09% Medium-Term Notes Due 2011 [Member]
Questar Pipeline 7.09% Medium-Term Notes Due 2011 [Member]
Questar Pipeline 6.57% Medium-Term Notes Due 2011 [Member]
Questar Pipeline 6.57% Medium-Term Notes Due 2011 [Member]
Questar Pipeline 6.57% Medium-Term Notes Due 2011 [Member]
Debt [Line Items]
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
Revolving credit arrangement credit commitments
Line of Credit Facility, Maximum Borrowing Capacity
Covenant compliance, revolving credit arrangement
Line of Credit Facility, Covenant Compliance
Commercial paper with variable-interest rates
Notes payable to parent
Weighted-average interest rate
Short-term Debt, Weighted Average Interest Rate
Debt Instrument, Interest Rate, Stated Percentage
Debt Instrument, Interest Rate, Stated Percentage
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum
Debt Instrument Maturity Dates
Debt Instrument Maturity Dates
Debt Instrument, Maturity Date Range, Start
Debt Instrument, Maturity Date Range, Start
Debt Instrument, Maturity Date Range, End
Debt Instrument, Maturity Date Range, End
Debt Instrument, Interest Rate, Effective Percentage
Debt Instrument, Interest Rate, Effective Percentage
Net Proceeds from Public Issuance of Long-Term Debt
Net Proceeds from Public Issuance of Long-Term Debt
Net Proceeds from Public Issuance of Long-Term Debt
Intercompany short-term debt repaid with proceeds
Short-Term Intercompany Debt Repaid With Proceeds
The amount of short-term intercompany debt repaid with net proceeds from public issuance of long-term debt.
Long-Term Debt Amounts Repaid During the Year
Long-Term Debt Amounts Repaid During the Year
Long-Term Debt Amounts Repaid During the Year
Total long-term debt outstanding
Long-term Debt, Gross
Less current portion
Less unamortized-debt discount
Debt Instrument, Unamortized Discount
Plus unamortized-debt premium
Debt Instrument, Unamortized Premium
Plus fair value hedge adjustment
Fair Value Hedge Adjustment to Long-Term Debt
Adjustment to carrying amount of long-term debt resulting from interest rate fair value hedging activities
Total long-term debt
Schedule to Financial Statements [Abstract]
Valuation and Qualifying Accounts Disclosure [Table]
Valuation and Qualifying Accounts Disclosure [Table]
Valuation Allowances and Reserves Type [Axis]
Valuation Allowances and Reserves Type [Axis]
Valuation Allowances and Reserves [Domain]
Valuation Allowances and Reserves [Domain]
Allowance for Bad Debt [Member]
Allowance for Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Valuation and Qualifying Accounts Disclosure [Line Items]
Movement in Valuation Allowances and Reserves [Roll Forward]
Movement in Valuation Allowances and Reserves [Roll Forward]
Beginning Balance
Valuation Allowances and Reserves, Balance
Amounts charged to expense
Valuation Allowances and Reserves, Charged to Cost and Expense
Deductions for accounts written off and other
Valuation Allowances and Reserves, Deductions
Ending Balance
Calculated fair value of options granted and major assumptions used in the Black-Scholes-Merton model
Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Text Block
Disclosure of assumptions used to determine fair value of a stock option or other award plan under which share-based compensation is awarded to employees. Disclosure may also include method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period.
Transactions involving stock options under the terms of the LTSIP
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Text Block]
Transactions involving restricted shares under the terms of the LTSIP
Disclosure Of Share Based Compensation Arrangements By Share Based Payment Award Restricted Stock [Text Block]
Disclosure Of Share Based Compensation Arrangements By Share Based Payment Award Restricted Stock [Text Block]
Options held under the LTSIP of Questar Pipeline and Questar Gas
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Text Block]
Restricted shares held under the LTSIP of Questar Pipeline and Questar Gas
Disclosure Of Share Based Compensation Arrangements By Share Based Payment Award LTSIP [Text Block]
Disclosure Of Share Based Compensation Arrangements By Share Based Payment Award LTSIP [Text Block]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Fair Values Derivatives, Balance Sheet Location, by Derivative Contract Type [Table]
Derivatives, Fair Value, by Derivative Instrument Risk [Axis]
Derivatives, Fair Value, by Balance Sheet Location [Axis]
Derivatives, Fair Value, by Balance Sheet Location [Axis]
Balance Sheet Location [Domain]
Balance Sheet Location [Domain]
Prepaid Expenses and Other [Member]
Prepaid Expenses and Other [Member]
Line item in the statement of financial position in which the fair value amounts of the derivative instruments are included.
Other Noncurrent Assets [Member]
Other Noncurrent Assets [Member]
Line item in the statement of financial position in which the fair value amounts of the derivative instruments are included.
Derivatives, Fair Value [Line Items]
Derivatives, Fair Value [Line Items]
Interest rate derivative instrument, Current
Derivative Assets, Current
Interest rate derivative instrument, Noncurrent
Derivative Assets, Noncurrent
Consolidated total, derivative assets
Derivative Assets
Statement of Stockholders' Equity [Abstract]
Statement, Equity Components [Axis]
Statement, Equity Components [Axis]
Equity Component [Domain]
Equity Component [Domain]
Common Stock Including Additional Paid in Capital [Member]
Common Stock Including Additional Paid in Capital [Member]
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income [Member]
Total [Member]
Subtotal Equity [Member]
The total of common sharholders equity which excludes the amounts of the non-controlling interest.
Noncontrolling Interest [Member]
Noncontrolling Interest [Member]
Beginning Balance
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest
Beginning Balance (in shares)
Shares, Issued
Common stock issued
Stock Issued During Period, Value, New Issues
Common stock issued (in shares)
Stock Issued During Period, Shares, New Issues
Common stock repurchased
Treasury Stock, Value, Acquired, Cost Method
Common stock repurchased (in shares)
Stock Repurchased During Period, Shares
Dividends paid
Dividends, Common Stock, Cash
Share-based compensation
Stock Issued During Period, Value, Share-based Compensation
Tax benefits from share-based compensation
Adjustments to Additional Paid in Capital, Tax Effect from Share-based Compensation
Equity Contribution from Parent
Equity Contribution from Parent
Additions to paid-in capital provided by the parent company.
Noncontrolling interest equity adjustment
Adjustments to Additional Paid in Capital, Reallocation of Noncontrolling Interest
Tax on equity adjustment
Income Tax Effects Allocated Directly to Equity, Equity Transactions
Spinoff of QEP
Stockholders' Equity Note, Spinoff Transaction
Distribution to noncontrolling interest
Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders
Other Comprehensive Income (Loss)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Change in unrealized fair value of derivatives
Other Comprehensive Income, Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax
Unrealized fair value of derivatives transferred to QEP
Unrealized Fair Value Of Derivatives Transferred To QEP
The unrealized fair value of derivatives that have been transferred to a subsidiary.
Change in unrecognized actuarial gain
Other Comprehensive Income, Defined Benefit Plan's Net Unamortized Gain (Loss) Arising During Period, before Tax
Change in unrecognized prior-service costs
Other Comprehensive Income, Defined Benefit Plan, Net Prior Service Cost (Credit) Arising During Period, before Tax
Interest rate cash flow hedges
Other comprehensive income unrealized gain loss on interest rate cash flow hedges, before tax
Pre tax change in accumulated gains and losses from interest rate cash flow hedge. A cash flow hedge is a hedge of the exposure to variability in the cash flows of a recognized asset or liability or a forecasted transaction that is attributable to a particular risk. Includes an entity's share of an equity investee's increase (decrease) in deferred hedging gains or losses.
Change in fair value of long-term investment
Other Comprehensive Income, Unrealized Holding Gain (Loss) on Securities Arising During Period, before Tax
Income taxes
Total comprehensive income
Comprehensive Income, Net of Tax, Including Portion Attributable to Noncontrolling Interest
Ending Balance
Ending Balance (in shares)
Schedule of Valuation and Qualifying Accounts Disclosure
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Schedule of Valuation and Qualifying Accounts
Schedule Of Valuation And Qualifying Accounts Text Block
An element designated to encapsulate the entire schedule of Bad Debt and Notes Receivable allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements.
Schedule of Related Party Transactions, by Related Party [Table]
Schedule of Related Party Transactions, by Related Party [Table]
Related Party Transactions, by Related Party [Axis]
Related Party Transactions, by Related Party [Axis]
Related Party [Domain]
Related Party [Domain]
Affiliated Entity [Member]
Questar And Other Affiliates [Member]
Questar And Other Affiliates [Member]
Income Type [Axis]
Income Type [Axis]
Income Type [Axis]
Revenues [Member]
Revenues [Member]
General and Administrative Expense [Member]
Operating Lease Expense [Member]
Interest Income [Member]
Transportation Storage And Processing Expense [Member]
Transportation Storage And Processing Expense [Member]
Cost of Sales [Member]
Cost of Sales [Member]
Related Party Transaction [Line Items]
Related Party Transaction [Line Items]
Related Party Transaction Expense From Transactions With Related Party
Related Party Transaction Expense From Transactions With Related Party
Related Party Transaction Rent Expense From Transactions With Related Party
Related Party Transaction Revenue From Transactions With Related Party
Related Party Transaction Revenue From Transactions With Related Party
Related Party Transaction Revenue From Transactions With Related Party
Operating Leases, Future Minimum Payments Due, Current
Amount Of Mdth Per Day Reserved Transportation Capacity On Questar Pipeline
Amount Of Mdth Per Day Reserved Transportation Capacity On Questar Pipeline
Amount Of Mdth Per Day Reserved Transportation Capacity On Questar Pipeline
Fair Value, by Balance Sheet Grouping [Table]
Fair Value, by Balance Sheet Grouping
Fair Value, by Balance Sheet Grouping [Text Block]
Schedule of discontinued operations
Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Text Block]
Assumptions used to calculate pension and postretirement benefits expenses [Abstract]
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]
Discount rate used to calculate benefits expenses (in hundredths)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate
Rate of increase in compensation used to calculate benefits expenses (in hundredths)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase
Long-term return on assets used to calculate benefits expenses (in hundredths)
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets
Assumed health care cost trend rates used to calculate benefits expenses [Abstract]
Health-care inflation rate used to calculate benefits expenses (in hundredths)
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year
Ultimate health care cost trend rate used to calculate benefits expenses (in hundredths)
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate
Year that rate reaches ultimate trend rate, used to calculate benefits expenses
Defined Benefit Plan, Year that Rate Reaches Ultimate Trend Rate
Estimated benefits expense for next fiscal year
Defined Benefit Plan, Estimated Expense In Next Fiscal Year
The employer's best estimate of benefits expense for the next fiscal year. For postretirement benefits, amount is before accretion of a regulatory liability.
Estimated amortization of actuarial loss from AOCI for next fiscal year
Defined Benefit Plan, Estimated Actuarial Loss Amortization From AOCI In Next Fiscal Year
The employer's best estimate of the actuarial loss to be amortized from AOCI related to defined benefit plans for the next fiscal year.
Estimated amortization of prior service cost from AOCI for next fiscal year
Defined Benefit Plan, Estimated Prior Service Cost Amortization From AOCI In Next Fiscal Year
The employer's best estimate of the prior service cost to be amortized from AOCI related to defined benefit plans for the next fiscal year.
Estimated amortization of net transition obligation from AOCI for next fiscal year
Defined Benefit Plan, Estimated Net Transition Obligation Amortization From AOCI In Next Fiscal Year
The employer's best estimate of the net transition obligation to be amortized from AOCI related to defined benefit plans for the next fiscal year.
Effect of 1% increase in the health care inflation rate on the yearly service and interest cost
Defined Benefit Plan, Effect of One Percentage Point Increase on Service and Interest Cost Components
Effect of 1% increase in the health care inflation rate on the accumulated post-retirement benefit obligation
Defined Benefit Plan, Effect of One Percentage Point Increase on Accumulated Postretirement Benefit Obligation
Effect of 1% decrease in the health care inflation rate on the yearly service and interest cost
Defined Benefit Plan, Effect of One Percentage Point Decrease on Service and Interest Cost Components
Effect of 1% decrease in the health care inflation rate on the accumulated post-retirement benefit obligation
Defined Benefit Plan, Effect of One Percentage Point Decrease on Accumulated Postretirement Benefit Obligation
Schedule of Short-term Debt
Schedule of Short-term Debt [Text Block]
Schedule Of Notes Payable
Schedule Of Notes Payable [Text Block]
Schedule Of Notes Payable [Text Block]
Schedule of Debt
Schedule Of Debt Text Block
This element may be used to capture the complete disclosure about debt arrangements including: (1) description of the debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified debt arrangement as of the balance-sheet date; (6) description of the refinancing of a debt obligation when that obligation is excluded from current liabilities in the balance sheet; (7) amount of an obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation; and (8) collateral requirements and other information necessary to a fair presentation.
Schedule Of Debt Maturities
Schedule Of Debt Maturities [Text Block]
Schedule Of Debt Maturities [Text Block]
Income Taxes By Legal Entity [Table]
Table of activity by line of business
Income Taxes By Legal Entity [Line Items]
Income Taxes By Legal Entity [Line Items]
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
Components of Income Tax Expense [Abstract]
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current
Current Federal Tax Expense (Benefit)
Deferred
Deferred Federal Income Tax Expense (Benefit)
State [Abstract]
State and Local Income Tax Expense (Benefit), Continuing Operations [Abstract]
Current
Current State and Local Tax Expense (Benefit)
Deferred
Deferred State and Local Income Tax Expense (Benefit)
Deferred investment tax credits recognized
Investment Tax Credit
Total income tax expense
Difference between the statutory federal income tax rate and the Company's effective income tax rate [Abstract]
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Federal income taxes statutory rate (in hundredths)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate
State income taxes, net of federal income tax benefit (in hundredths)
Effective Income Tax Rate Reconciliation, State and Local Income Taxes
Tax benefits from dividends paid to employee stock plan (in hundredths)
Effective Income Tax Rate Reconciliation, Deductions, Employee Stock Ownership Plan Dividends
Amortize investment tax credits related to rate regulated assets (in hundredths)
Effective Income Tax Rate Reconciliation, Tax Credits, Investment
Other (in hundredths)
Effective Income Tax Rate Reconciliation, Deductions, Other
Effective income tax rate (in hundredths)
Effective Income Tax Rate, Continuing Operations
Deferred tax liabilities [Abstract]
Deferred Tax Liabilities [Abstract]
Property, plant and equipment
Deferred Tax Liabilities, Property, Plant and Equipment
Employee benefits and compensation costs
Deferred Tax Liabilities, Prepaid Pension Costs
Deferred tax liabilities - noncurrent
Deferred Tax Liabilities, Noncurrent
Deferred tax assets [Abstract]
Deferred Tax Assets, Net [Abstract]
Employee benefits and compensation costs
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits
Hedging activities
Deferred Tax Assets, Hedging Transactions
Net operating loss carryforward
Deferred Tax Assets, Operating Loss Carryforwards
Other
Deferred Tax Assets, Other
Deferred tax assets - noncurrent
Deferred Tax Assets, Gross, Noncurrent
Deferred income taxes - noncurrent
Deferred income taxes - current asset
Deferred Tax Assets, Gross, Current
Deferred income taxes - current liability
Deferred Tax Liabilities, Current
Deferred income taxes - current
Actual Allocation [Abstract]
Defined Benefit Plan, Actual Plan Asset Allocations [Abstract]
Total domestic equity securities (in hundredths)
Defined Benefit Plan, Equity Securities
Foreign equity securities [Abstract]
Foreign Equity Securities Actual [Abstract]
-- None. No documentation exists for this element. --
Developed market foreign equity securities (in hundredths)
Defined Benefit Plan Developed Market Foreign Equity Securities
This element represents the percentage of the fair value of foreign equity securities, to the fair value of total plan assets held as of the measurement date.
Emerging market foreign equity securities (in hundredths)
Defined Benefit Plan Developed Market Emerging Market Foreign Equity Securities
This element represents the percentage of the fair value of foreign emerging market equity securities, to the fair value of total plan assets held as of the measurement date.
Total foreign securities (in hundredths)
Defined Benefit Plan, Foreign Equity Securities
This element represents the total percentage of the fair value of foreign securities, to the fair value of total plan assets held as of the measurement date.
Debt securities [Abstract]
Debt Securities Actual [Abstract]
-- None. No documentation exists for this element. --
Investment grade intermediate term debt (in hundredths)
Defined Benefit Plan Investment Grade Intermediate Term Debt Securities
The percentage of the fair value of investment grade intermediate term debt securities to the fair value of total plan assets held as of the measurement date.
Investment grade long-term debt (in hundredths)
Defined Benefit Plan Investment Grade Long Term Debt Securities
The percentage of the fair value of investment grade long-term debt securities to the fair value of total plan assets held as of the measurement date.
Below-investment grade debt (in hundredths)
Defined Benefit Plan Below Investment Grade Debt Securities
The percentage of the fair value of below-investment grade debt securities to the fair value of total plan assets held as of the measurement date.
Total debt securities (in hundredths)
Defined Benefit Plan, Debt Securities
Cash and short-term investments (in hundredths)
Defined Benefit Plan Cash And Short Term Investments
This element represents the total percentage of the fair value of cash and short-term investments, to the fair value of total plan assets held as of the measurement date.
Inflation protection securities (in hundredths)
Defined Benefit Plan Inflation Protection Securities
This element represents the total percentage of the fair value of inflation protection securities, to the fair value of total plan assets held as of the measurement date.
Policy Range [Abstract]
Defined Benefit Plan, Assets, Target Allocations [Abstract]
Total domestic equity securities - minimum range (in hundredths)
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities, Range Minimum
Total domestic equity securities - maximum range (in hundredths)
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities, Range Maximum
Foreign equity securities [Abstract]
Foreign Equity Securities Policy [Abstract]
Foreign Equity Securities Policy [Abstract]
Total foreign securities - minimum range (in hundredths)
Defined Benefit Plan Target Allocation Percentage Of Assets Foreign Securities Range Minimum
Target allocation minimum percentage of investments in foreign securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.
Total foreign securities - maximum range (in hundredths)
Defined Benefit Plan Target Allocation Percentage Of Assets Foreign Securities Range Maximum
Target allocation maximum percentage of investments in foreign securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.
Debt securities [Abstract]
Debt Securities Policy [Abstract]
Debt Securities Policy [Abstract]
Total debt securities - minimum range (in hundredths)
Defined Benefit Plan, Target Allocation Percentage of Assets, Debt Securities, Range Minimum
Total debt securities - maximum range (in hundredths
Defined Benefit Plan, Target Allocation Percentage of Assets, Debt Securities, Range Maximum
Inflation protection securities - minimum range (in hundredths)
Defined Benefit Plan Target Allocation Percentage Of Assets Inflation Protection Securities Range Minimum
Target allocation percentage of investments in inflation protection securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.
Inflation protection securities - maximum range (in hundredths)
Defined Benefit Plan Target Allocation Percentage Of Assets Inflation Protection Securities Range Maximum
Target allocation percentage of investments in inflation protection securities to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.
Cash and short-term investments - minimum range (in hundredths)
Defined Benefit Plan Target Allocation Percentage Of Assets Cash And Short Term Investments Range Minimum
Target allocation percentage of investments in cash and short-term investments to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.
Cash and short-term investments - maximum range (in hundredths)
Defined Benefit Plan Target Allocation Percentage Of Assets Cash And Short Term Investments Range Maximum
Target allocation percentage of investments in cash and short-term investments to total plan assets presented on a weighted-average basis as of the measurement date of the latest statement of financial position.
Total debt securities [Abstract]
Total Debt Securities Abstract
Average maturities for investment grade intermediate term debt (in years)
Defined Benefit Plan Additional Disclosures About Investment Grade Intermediate Term Debt
Disclosure of additional asset categories and additional information about specific assets within a category that is useful in understanding the risks associated with each asset category and the overall expected long-term rate of return on assets, specifically the average maturities of the investment in years.
Average maturities for investment grade long-term debt (in years)
Defined Benefit Plan Additional Disclosures About Investment Grade Long Term Debt
Disclosure of additional asset categories and additional information about specific assets within a category that is useful in understanding the risks associated with each asset category and the overall expected long-term rate of return on assets, specifically the average maturities of the investment in years.
Average maturities for below-investment grade debt (in years)
Defined Benefit Plan Additional Disclosures About Below Investment Grade Debt
Disclosure of additional asset categories and additional information about specific assets within a category that is useful in understanding the risks associated with each asset category and the overall expected long-term rate of return on assets, specifically the average maturities of the investment in years.
Time over which set performance objectives for each investment manager is expected to be met
Defined Benefit Plan Additional Disclosures About Performance Objectives
This element represents the period of time in which set performance objectives for each investment manager is expected to be met.
Schedule of Earnings Per Share, Diluted, by Common Class [Table]
Class of Stock [Axis]
Class of Stock [Domain]
Earnings Per Share, Diluted [Line Items]
Reconciliation of the components of basic and diluted shares in the EPS Calculation [Abstract]
Weighted-average basic common shares outstanding (in shares)
Potential number of shares issuable under the Long-term Stock Incentive Plan (in shares)
Incremental Common Shares Attributable to Share-based Payment Arrangements
Average diluted common shares outstanding (in shares)
Dividend Reinvestment and Stock Purchase Plan (Reinvestment Plan) [Abstract]
Dividend Reinvestment And Stock Purchase Plan Reinvestment Plan Abstract
Shares issued
Stock Issued During Period, Shares, Dividend Reinvestment Plan
Shares reserved for future issuance
Common Stock, Capital Shares Reserved for Future Issuance
Long-Term Stock Incentive Plan [Abstract]
Long Term Stock Incentive Plan Abstract
Stock option minimum term (in years)
Stock Option Minimum Term
Reflects the minimum dating as to when the share-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).
Stock option maximum term (in years)
Stock Option Maximum Term
Reflects the maximum dating as to when the share-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).
Stock option majority minimum term (in years)
Stock Option Majority Minimum Term
Reflects the minimum dating for the majority of share-based awards that expires as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).
Stock option majority maximum term (in years)
Stock Option Majority Maximum Term
Reflects the maximum dating for the majority of share-based awards that expires as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).
Minimum number of installments for vesting of options held by employees
Minimum Number Of Installments For Vesting Of Options Held By Employees
The minimum number of equal annual installments needed to fully vest employee options provided for in long-term stock incentive plan.
Maximum number of installments for vesting of options held by employees
Maximum Number Of Installments For Vesting Of Options Held By Employees
The maximum number of equal annual installments needed to fully vest employee options provided for in long-term stock incentive plan.
Number of installments for vesting of options held by non-employee directors
Number Of Installments For Vesting Of Options Held By Non Employee Directors
The number of installments needed to fully vest non-employee director's options provided for in long-term stock incentive plan.
Vesting period for options held by non-employee directors after grant (in months)
Minimum vesting period for majority of restricted shares (in years)
Minimum Vesting Period For Majority Of Restricted Shares
Description of the minimum period of time over which an employee's right to exercise restricted shares is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).
Maximum vesting period for majority of restricted shares (in years)
Maximum Vesting Period For Majority Of Restricted Shares
Description of the maximum period of time over which an employee's right to exercise restricted shares is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).
Performance share performance period (in years)
The date the share based award will be distributed
Nature of Business
Nature Of Operations Policy Text Block
Describes the nature of an entity's business, the major products or services it sells or provides and its principal markets, including the locations of those markets. If the entity operates in more than one business, the disclosure also indicates the relative importance of its operations in each business and the basis for the determination (for example, assets, revenues, or earnings). Disclosures about the nature of operations need not be quantified; relative importance could be conveyed by use of terms such as "predominately", "about equally", or "major and other". This element is also referred to as "Business Description".
Principles of Consolidation
Consolidation, Policy [Text Block]
Investment in Unconsolidated Affiliate
Equity Method Investments Policy [Text Block]
Describes an entity's application of the equity method of accounting to investments. The description includes information such as: initially recording an investment in the stock of an investee at cost; adjusting the carrying amount of the investment to recognize the investor's share of the earnings or losses of the investee and adjustments to reflect the investor's share of changes in the investee's capital. An entity also may describe how such investments are assessed for impairment.
Use of Estimates
Use Of Estimates Policy Text Block
Provides an entity's explanation that the preparation of financial statements in conformity with generally accepted accounting principles requires the use of management estimates. Estimates used in the determination of carrying amounts of assets or liabilities, or in disclosure of gain or loss contingencies should be disclosed if known information available prior to issuance of the financial statements indicates that both of these criteria are met: (1) It is at least reasonably possible that the estimate of the effect on the financial statements of a condition, situation, or set of circumstances that existed at the date of the financial statements will change in the near term (less than one year from the date of issuance) due to one or more future confirming events, and (2) The effect of the change would be material to the financial statements. The disclosure should indicate the nature of the uncertainty and include an indication that it is at least reasonably possible that a change in the estimate will occur in the near term. Disclosure of the factors that cause the estimate to be sensitive to change also is encouraged. Entities also may identify those areas that are subject to significant estimates.
Revenue Recognition
Revenue Recognition, Policy [Text Block]
Regulation
Regulatory Assets And Liabilities Recognition Criteria Policy Text Block
Describes the entity's criteria for recording regulatory assets and regulatory liabilities only because they are included in the rate-setting process, and rate-related accruals and deferrals, such as amounts receivable from (or due to) customers under fuel adjustment clauses and interim rates collected prior to regulatory approval.
Cash and Cash Equivalents
Cash and Cash Equivalents, Policy [Text Block]
Notes Receivable and Notes Payable
Notes Receivable And Notes Payable Policy Text Block
Describes the entities management of Notes Receivable and Notes Payable. It encompasses the Company's interest rate policy.
Property, Plant and Equipment
Property, Plant and Equipment, Policy [Text Block]
Cost-of-service gas and oil operations
Full Cost Or Successful Efforts Policy Text Block
Denotes whether the enterprise uses the Successful Efforts method or Full Cost method for accounting for costs incurred in oil and gas activities.
Contributions-in-aid-of construction
Contributions In Aid Of Construction Policy Text Block
Describes the customer contributions-in-aid of construction for main-line extensions, to extend its services to their properties.
Depreciation, depletion and amortization
Regulated And Non Regulated Depreciation And Amortization Policy Text Block
For regulatory assets - describes the accounting and regulatory policies and methodologies and assumptions used to systematically allocate capitalized costs to periods that benefit from the use thereof. May include descriptions of regulatory treatment for: estimated removal and disposal costs, which could result in recording asset retirement obligations or regulatory liabilities. The amortization of plant-related regulatory assets could also be described. For nonregulated assets -describes an entity's accounting policy for property, plant and equipment which may include the basis of such assets, depreciation methods used and estimated useful lives, the entity's capitalization policy, including its accounting treatment for costs incurred for repairs and maintenance activities, whether such asset balances include capitalized interest and the method by which such is calculated, how disposals of such assets are accounted for and how impairment of such assets is assessed and recognized.
Impairment of Long-Lived Assets
Impairment or Disposal of Long-Lived Assets, Policy [Text Block]
Goodwill and Other Intangible Assets
Goodwill and Intangible Assets, Policy [Text Block]
Capitalized Interest and Allowance for Funds Used During Construction
Capitalized Interest And Allowance For Funds Used During Construction Policy Text Block
Describes the companies adherence to regulations requiring the capitalization of interest and allowance for funds used during the construction period of rate-regulated plant and equipment.
Derivative Instruments and Hedging Activities
Derivatives, Policy [Text Block]
Credit Risk
Concentration Risk Disclosure Policy Text Block
Description of any concentrations existing at the date of the financial statements that make an entity vulnerable to a reasonably possible, near-term, severe impact. The entity should inform financial statement users about the general nature of the risk associated with the concentration, and may indicate the percentage of concentration risk as of the balance sheet date. Disclosure of any financial instrument credit risk concentration also should indicate the maximum amount of loss that would be incurred upon complete failure of the counterparty to perform and the entity's collateral policies or other policies that limit the loss exposure. This element may be used as a single block of text to encapsulate the entire disclosure including data and tables.
Asset Retirement Obligations
Asset Retirement Obligations Policy Text Block
Describes an entity's accounting policy for determining amounts to accrue and charge against earnings so as to satisfy legal obligations associated with the retirement (through sale, abandonment, recycling, or disposal in some other manner) of a tangible long-lived asset that result from the acquisition, construction, or development and (or) the normal operation of a long-lived asset. This accounting policy disclosure excludes obligations arising 1) in connection with leased property, whether imposed by a lease agreement or by a party other than the lessor, that meet the definition of either minimum lease payments or contingent rentals; 2) solely from a plan to sell or otherwise dispose of a long-lived asset and 3) from certain environmental remediation liabilities.
Income Taxes
Income Tax, Policy [Text Block]
Earnings Per Share
Earnings Per Share, Policy [Text Block]
Share-Based Compensation
Share Based Compensation Option And Incentive Plans Policy Text Block
Describes an entity's accounting policy for stock option and stock incentive plans. This disclosure may include (1) the types of stock option or incentive plans sponsored by the entity (2) the groups that participate in (or are covered by) each plan (3) significant plan provisions and (4) how stock compensation is measured, and the methodologies and significant assumptions used to determine that measurement.
Comprehensive Income - Questar
Comprehensive Income Note Policy - Questar [Text Block]
This element may include the following: 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. Components of comprehensive income include: (1) foreign currency translation adjustments; (2) gains and losses on foreign currency transactions that are designated as, and are effective as, economic hedges of a net investment in a foreign entity; (3) gains and losses on intercompany foreign currency transactions that are of a long-term-investment nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; (4) change in the market value of a futures contract that qualifies as a hedge of an asset reported at fair value; (5) unrealized holding gains and losses on available-for-sale securities and that resulting from transfers of debt securities from the held-to-maturity category to the available-for-sale category; (6) a net loss recognized as an additional pension liability not yet recognized as net periodic pension cost; and (7) the net gain or loss and net prior service cost or credit for pension plans and other postretirement benefit plans.
Comprehensive Income - Questar Pipeline
Comprehensive Income Note Policy - Questar Pipeline [Text Block]
This element may include the following: 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. Components of comprehensive income include: (1) foreign currency translation adjustments; (2) gains and losses on foreign currency transactions that are designated as, and are effective as, economic hedges of a net investment in a foreign entity; (3) gains and losses on intercompany foreign currency transactions that are of a long-term-investment nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; (4) change in the market value of a futures contract that qualifies as a hedge of an asset reported at fair value; (5) unrealized holding gains and losses on available-for-sale securities and that resulting from transfers of debt securities from the held-to-maturity category to the available-for-sale category; (6) a net loss recognized as an additional pension liability not yet recognized as net periodic pension cost; and (7) the net gain or loss and net prior service cost or credit for pension plans and other postretirement benefit plans.
Business Segments
Segment Reporting Policy Text Block
This element may be used to describe the disclosure of reporting segments. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10% or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.
Recent Accounting Developments
Recent Accounting Developments [Text Block]
A summary of recent accounting pronouncements affecting the entity.
Reclassifications
Reclassifications Policy Text Block
Classifications in the current financial statements may be different from classifications in the prior year's financial statements. Disclose any material changes in classification including an explanation of the reason for the change and the areas impacted.
Schedule of Segment Reporting Information, by Segment [Table]
Schedule of Segment Reporting Information, by Segment [Table]
Segment Reporting Information, by Segment [Axis]
Segment Reporting Information, by Segment [Axis]
Reporting Segment [Domain]
Reporting Segment [Domain]
Interco. Trans. [Member]
Business Intersegment, Eliminations [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information [Line Items]
Number of complementary lines of business
Number Of Ccmplementary Lines Of Business
The number of complementary lines of business operated by the company.
Revenues [Abstract]
Segment Reporting Information, Revenue [Abstract]
From unaffiliated customers
Segment Reporting Information, Revenue from External Customers
From affiliated companies
Segment Reporting Information, Intersegment Revenue
Total Revenues
Segment Reporting Information, Revenue
Operating expenses [Abstract]
Cost of sales
Production and other taxes
Depreciation, depletion and amortization
Segment Reporting Information, Depreciation, Depletion, and Amortization Expense
Other operating expenses
Other Cost and Expense, Operating
Net gain (loss) from asset sales
Operating Income (loss)
Segment Reporting Information, Operating Income (Loss)
Income from unconsolidated affiliate
Segment Reporting Information, Equity in Net Income of Equity Method Investees of Segment
Interest expense
Segment Reporting Information, Interest Expense
Income taxes
Segment Reporting Information, Income Tax Expense (Benefit)
Income from Continuing Operations
Segment Reporting Information, Profit (Loss)
Segment Reporting Information, Additional Information [Abstract]
Segment Reporting Information, Additional Information [Abstract]
Identifiable assets of continuing operations
Segment Reporting, Segment Assets
Goodwill
Segment Reporting Information, Goodwill
Investment in unconsolidated affiliate
Segment Reporting Information, Investment in Equity Method Investees
Cash capital expenditures
Cash Payments To Acquire Property Plant And Equipment
The cash outflow associated with the acquisition of long-lived, physical assets and cash payments to unconsolidated affiliates that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.
Accrued capital expenditures
Capital Expenditures Incurred but Not yet Paid
Common Stock, Dividends, Per Share, Cash Paid
Common Stock, Dividends, Per Share, Cash Paid
Entity Information [Line Items]
Entity Information [Line Items]
Entity [Text Block]
Entity Registrant Name
Entity Registrant Name
Entity Central Index Key
Entity Central Index Key
Current Fiscal Year End Date
Current Fiscal Year End Date
Entity Well-known Seasoned Issuer
Entity Well-known Seasoned Issuer
Entity Voluntary Filers
Entity Voluntary Filers
Entity Current Reporting Status
Entity Current Reporting Status
Entity Filer Category
Entity Filer Category
Entity Public Float
Entity Public Float
Entity Common Stock, Shares Outstanding
Entity Common Stock, Shares Outstanding
Document Fiscal Year Focus
Document Fiscal Year Focus
Document Fiscal Period Focus
Document Fiscal Period Focus
Document Type
Document Type
Amendment Flag
Amendment Flag
Document Period End Date
Document Period End Date
Common Stock, No Par Value
Common Stock, No Par Value
Common Stock, Par or Stated Value Per Share
Common Stock, Par or Stated Value Per Share
Common Stock, Shares Authorized
Common Stock, Shares Authorized
Common Stock, Shares, Issued
Common Stock, Shares, Issued
Common Stock, Shares Outstanding
Common Stock, Shares, Outstanding