Acquisitions [Abstract] Acquisitions [Abstract] Acquisitions [Text Block] Mergers, Acquisitions and Dispositions Disclosures [Text Block] Compensation and Retirement Disclosure [Abstract] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Table] Defined Benefit Plans Funding Type [Axis] Defined Benefit Plans Funding Type [Axis] The funding type of defined benefit plan. Plan Funding Type [Domain] Plan Funding Type [Domain] Information on defined benefit plan by funding type. Funded Pension Plan [Member] Funded Pension Plan [Member] Information on funded defined benefit pension plan. Unfunded Pension Plan [Member] Unfunded Pension Plan [Member] Information on unfunded defined benefit pension plan. Other Postretirement Benefit Plans, Defined Benefit [Member] Other Postretirement Benefit Plan, Defined Benefit [Member] Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] Defined Benefit Plans and Other Postretirement Benefit Plans [Domain] Defined Benefit Plan and Other Postretirement Benefit Plan [Domain] Pension [Member] Pension Plan, Defined Benefit [Member] Operating Activities [Axis] Operating Activities [Axis] Operating Activities [Domain] Operating Activities [Domain] Continuing Operations [Member] Continuing Operations [Member] Discontinued Operations [Member] Discontinued Operations [Member] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] Contributions to pension plan Pension Contributions Expected to contribute to pension plans Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year Recurring employee benefit expense Other Postretirement Benefit Expense Service cost Defined Benefit Plan, Service Cost Interest cost Defined Benefit Plan, Interest Cost Expected return on plan assets Defined Benefit Plan, Expected Return on Plan Assets Amortization of prior service costs Defined Benefit Plan, Amortization of Prior Service Cost (Credit) Recognized net actuarial loss Defined Benefit Plan, Actuarial Gain (Loss) Loss on curtailment Defined Benefit Plan, Curtailments Expense related to special termination benefits Special Termination Benefits Special Termination Benefits Amortization of actuarial loss Defined Benefit Plan, Amortization of Gains (Losses) Periodic expense Defined Benefit Plan, Net Periodic Benefit Cost Restructuring Costs [Abstract] Schedule of Restructuring and Related Costs [Table] Schedule of Restructuring and Related Costs [Table] Business Segments [Axis] Segments [Axis] Segment [Domain] Segments [Domain] QEP Energy [Member] QEP Energy [Member] QEP Energy Company, (QEP Energy) acquires, explores for, develops and produces natural gas, oil, and natural gas liquids (NGL). QEP Marketing [Member] QEP Marketing [Member] Represents derivative contracts for QEP Marketing. Restructuring Cost and Reserve [Axis] Restructuring Type [Axis] Type of Restructuring [Domain] Type of Restructuring [Domain] One-time Termination Benefits [Member] One-time Termination Benefits [Member] Employee Relocation [Member] Employee Relocation [Member] Termination of Lease [Member] Facility Closing [Member] Restructuring Cost and Reserve [Line Items] Restructuring Cost and Reserve [Line Items] Restructuring costs incurred from inception to reporting date Restructuring and Related Cost, Cost Incurred to Date Restructuring Charges Restructuring Charges Restructuring Charges Related To Discontinued Operations Restructuring Charges Related To Discontinued Operations Restructuring Charges Related To Discontinued Operations Asset Retirement Obligation [Abstract] Asset Retirement Obligations Asset Retirement Obligation Disclosure [Text Block] Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Permian Basin [Member] Permian Basin [Member] Permian Basin [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Term Loan due 2017 [Member] Term Loan due 2017 [Member] Term Loan due in 2017 Business Acquisition [Line Items] Business Acquisition [Line Items] Liabilities incurred Asset Retirement Obligation, Liabilities Incurred Aggregate sale price of assets disposed Significant Acquisitions and Disposals, Acquisition Costs or Sale Proceeds Pretax loss on sale of assets Significant Acquisitions and Disposals, Gain (Loss) on Sale or Disposal, Pretax Consideration Held In Escrow Pending Title Defects Consideration Held In Escrow Pending Title Defects Consideration Held In Escrow Pending Title Defects Payments to Acquire Businesses, Gross Payments to Acquire Businesses, Gross Payments to Acquire Businesses Net Payments to Acquire Businesses Net Payments to Acquire Businesses Net Net acres of producing and undeveloped oil and gas properties Gas And Oil Acreage Acquired Producing And Undeveloped Gas And Oil Acreage Acquired Producing And Undeveloped Number of vertical producing wells Number of vertical producing wells Number of vertical producing wells Escrow Deposit Escrow Deposit Borrowings to Fund Acquisition Borrowings to Fund Acquisition Borrowings to Fund Acquisition Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Business Acquisition, Transaction Costs Business Acquisition, Transaction Costs Debt Issuance Cost Debt Issuance Cost Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative [Table] Derivative [Table] Term Loan Tranche [Axis] Term Loan Tranche [Axis] Term Loan Tranche [Axis] Term Loan Tranche [Domain] Term Loan Tranche [Domain] [Domain] for Term Loan Tranche [Axis] First Term Loan Tranche [Member] First Term Loan Tranche [Member] First Term Loan Tranche [Member] Second Term Loan Tranche [Member] Second Term Loan Tranche [Member] Second Term Loan Tranche [Member] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] Interest Rate Swap [Member] Interest Rate Swap [Member] Energy [Axis] Energy [Axis] Energy [Domain] Energy [Domain] Derivative, by Nature [Axis] Derivative, by Nature [Axis] Derivative, Name [Domain] Derivative, Name [Domain] Position [Axis] Position [Axis] Position [Domain] Position [Domain] Derivative [Line Items] Derivative [Line Items] Notional amount Derivative, Notional Amount Derivative, Maturity Date Derivative, Maturity Date Derivative, Fixed Interest Rate Derivative, Fixed Interest Rate Derivative, Description of Terms Derivative, Description of Terms Fair Value Disclosures [Abstract] Fair Value, by Balance Sheet Grouping [Table] Fair Value, by Balance Sheet Grouping [Table] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Long-term [Member] Long term [Member] Derivative contracts with maturities in excess of one year. Short-term [Member] Short term [Member] Derivative contracts with maturities of one year or less. Commodity Contract [Member] Commodity Contract [Member] Fair Value by Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Measurements, Recurring [Member] Fair Value, Measurements, Recurring [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Level 1 [Member] Fair Value, Inputs, Level 1 [Member] Level 2 [Member] Fair Value, Inputs, Level 2 [Member] Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Netting Adjustments [Member] Netting [Member] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] Financial Assets Derivative Asset [Abstract] Derivative Asset, Fair Value, Gross Derivative Asset, Fair Value, Gross Asset Net amount of derivative assets presented on condensed consolidated balance sheets Derivative Asset, Fair Value, Amount Offset Against Collateral Financial liabilities Derivative Liability [Abstract] Derivative Liability, Fair Value, Gross Derivative Liability, Fair Value, Gross Liability Net amount of derivative liabilities presented on condensed consolidated balance sheets Derivative Liability, Fair Value, Amount Offset Against Collateral Share-based Compensation [Abstract] Equity-Based Compensation Disclosure of Compensation Related Costs, Share-based Payments [Text Block] Nature Of Business [Abstract] -- None. No documentation exists for this element. -- Value of midstream business sold ValueOfBusinessSold Value Of Business Sold Debt refinancing included in sale of midstream business Debt Refinanced In Business Sale Debt Refinanced In Business Sale Discontinued Operations and Disposal Groups [Abstract] Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Disposal Groups, Including Discontinued Operations, Disclosure [Text Block] Schedule of Significant Acquisitions and Disposals [Table] Schedule of Significant Acquisitions and Disposals [Table] Petroleum Reserves [Axis] Petroleum Reserves [Axis] Type of Reserve [Domain] Type of Reserve [Domain] Proved Property [Member] Proved Property [Member] Proved Property [Member] Unproved Property [Member] Unproved Property [Member] Unproved Property [Member] Other Liabilities [Member] Other Liabilities [Member] Significant Acquisitions and Disposals [Line Items] Significant Acquisitions and Disposals [Line Items] Liabilities incurred Fair value of assets acquired (liabilities assumed) Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Groups, Including Discontinued Operations, Name [Domain] Disposal Groups, Including Discontinued Operations, Name [Domain] Midstream Business Held For Sale [Member] Midstream Business Held For Sale [Member] Midstream Business Held For Sale [Member] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] NGL sales Natural Gas Midstream Revenue Other revenue Gas Gathering, Transportation, Marketing and Processing Revenue Purchased gas, oil and NGL sales Refining and Marketing Revenue Total Revenues Oil and Gas Revenue Purchased gas, oil and NGL expense Refining and Marketing Costs Lease operating expense Oil and Gas Property, Lease Operating Expense Natural gas, oil and NGL transportation and other handling costs Shipping, Handling and Transportation Costs Gathering, processing and other Gas Gathering, Transportation, Marketing and Processing Costs General and administrative General and Administrative Expense Production and property taxes Production Tax Expense Depreciation, depletion and amortization Results of Operations, Depreciation, Depletion, Amortization and Accretion Total operating expenses Operating Expenses Net loss from asset sales Gain (Loss) on Disposition of Property Plant Equipment OPERATING INCOME Operating Income (Loss) Interest income and other loss Interest Income, Operating Income from unconsolidated affiliates Income (Loss) from Equity Method Investments Interest expense Interest Expense INCOME FROM DISCONTINUED OPERATIONS BEFORE INCOME TAXES Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Income taxes Discontinued Operation, Tax Effect of Discontinued Operation NET INCOME FROM DISCONTINUED OPERATIONS Net Income From Discontinued Operations Including Portion Attributable To Noncontrolling Interest Net Income From Discontinued Operations Including Portion Attributable To Noncontrolling Interest Net income attributable to noncontrolling interest Net Income (Loss) Attributable to Noncontrolling Interest DISCONTINUED OPERATIONS, NET OF INCOME TAX Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Income from discontinued operations before income taxes attributable to QEP from QEP Midstream Income (Loss) Attributable to Parent Ownership percentage Ownership Percentage Ownership Percentage Earnings Per Share [Abstract] Earnings Per Share Earnings Per Share [Text Block] Commitments and Contingencies Disclosure [Abstract] Contingencies Commitments and Contingencies Disclosure [Text Block] Debt Disclosure [Abstract] Debt Debt Disclosure [Text Block] Loss Contingencies [Table] Loss Contingencies [Table] Loss Contingencies [Line Items] Loss Contingencies [Line Items] Deferred Revenue Deferred Revenue Administrative penalty Administrative Penalty Administrative Penalty Loss Contingency, Range of Possible Loss, Maximum Loss Contingency, Range of Possible Loss, Maximum Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Revolving Credit Facility due 2016 [Member] Line of Credit [Member] 6.05% Senior Notes due 2016 [Member] Senior Notes Due 2016 [Member] Senior Notes Due 2016. 6.80% Senior Notes due 2018 [Member] Senior Notes Due 2018 [Member] Senior Notes Due 2018. Debt Instrument [Line Items] Debt Instrument [Line Items] Long-term Debt, Gross Long-term Debt, Gross Revolving credit facility origination fees Less unamortized discount Debt Instrument, Unamortized Discount Long-term debt, interest rate (in hundredths) Debt Instrument, Interest Rate, Stated Percentage Maturity date of long-term debt Debt Instrument, Maturity Date Debt Maturity Period Debt Maturity Period Debt Maturity Period Borrowing capacity Line of Credit Facility, Current Borrowing Capacity Potential increased borrowing capacity Line of Credit Facility, Maximum Borrowing Capacity NumberOfMaturityDateExtensions NumberOfMaturityDateExtensions Represents the number of maturity date extensions allowed by the provisions of the credit agreement. Additional period with in which maturity to be extended Additional period with in which maturity to be extended Represents additional period with in which maturity to be extended. Proceeds from Issuance of Long-term Debt Proceeds from Issuance of Long-term Debt Weighted-average interest rate (in hundredths) Long-term Debt, Weighted Average Interest Rate Amount outstanding Line of Credit Facility, Amount Outstanding Letters of credit outstanding Letters of Credit Outstanding, Amount Principal amount of senior notes outstanding Senior Notes Debt Instrument, Maturity Date Range, Start Debt Instrument, Maturity Date Range, Start Debt Instrument, Maturity Date Range, End Debt Instrument, Maturity Date Range, End Senior Notes, stated interest rate, minimum (in hundredths) Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum Senior Notes, stated interest rate, maximim (in hundredths) Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum Subsequent Event [Abstract] Subsequent Event [Abstract] Subsequent Event [Table] Subsequent Event [Table] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Line Items] Subsequent Event [Line Items] Aggregate sale price for announced divestiture Aggregate Sale Price For Announced Divestiture Aggregate Sale Price For Announced Divestiture Net book value of property disposed Significant Acquisitions And Disposals Book Value Of Property Disposed Significant Acquisitions And Disposals Book Value Of Property Disposed Nature of Business Nature of Operations [Text Block] Statement of Financial Position [Abstract] LIABILITIES AND EQUITY Liabilities and Equity [Abstract] EQUITY Stockholders' Equity Attributable to Parent [Abstract] Common stock, par value (in dollars per share) Common Stock, Par or Stated Value Per Share Common stock, shares authorized (in shares) Common Stock, Shares Authorized Common stock, shares issued (in shares) Common Stock, Shares, Issued Treasury stock (in shares) Treasury Stock, Shares Subsequent Events Subsequent Events [Text Block] Derivative Contracts [Abstract] Derivative Contracts [Abstract] Derivative Instruments, Gain (Loss) by Hedging Relationship, by Income Statement Location, by Derivative Instrument Risk [Table] Derivative Instruments, Gain (Loss) [Table] Derivative Instrument Contract Type [Axis] Derivative Instrument Contract Type [Axis] Information by name that identifies a derivative or a group of derivatives by (derivative) contract risk type. Derivative Instrument Contract Type [Domain] Derivative Instrument Contract Type [Domain] The name that identifies a derivative or a group of derivatives, on a disaggregated basis, by contract risk type. Natural gas derivative contracts [Member] Natural gas derivative contracts [Member] Derivative instrument whose primary underlying risk is tied to commodity prices. Oil derivative contracts [Member] Oil derivative contracts [Member] Derivative instrument whose primary underlying risk is tied to commodity prices. Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Derivative, Gain Loss by Income Statement Location [Axis] Derivative, Gain Loss by Income Statement Location [Axis] The location and amount of gains and losses reported in the statement of financial performance. Derivative, Gain (Loss) by Income Statement Location [Domain] Derivative, Gain (Loss) by Income Statement Location [Domain] The income statement and other comprehensive income location of gains and losses on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments, by income statement location. Natural Gas Sales (MMbtu) [Member] Natural Gas Sales [Member] Derivative contracts to lock in a margin on natural gas volumes placed into storage. Oil Sales (Bbls) [Member] Oil Sales [Member] Derivative contracts utilized for oil sales. Realized and unrealized gains on commodity derivative instruments [Member] Realized and unrealized gains on commodity derivative instruments [Member] The income statement location of gains and losses on derivative instruments on derivative instruments not designated as hedging instruments, by income statement location. Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments Not Designated as Hedging Instruments [Abstract] Derivative Instruments Not Designated as Hedging Instruments [Abstract] Realized gain (loss) on commodity derivative contracts Realized gain (loss) on commodity derivative contracts not designated as hedging instruments Represents the realized gain (loss) on commodity derivative contracts not designated as hedging instruments for the period. Unrealized gain (loss) on commodity derivative contracts Unrealized gain (loss) on commodity derivative contracts not designated as hedging instruments Represents the unrealized gain (loss) on commodity derivative contracts not designated as hedging instruments for the period. Realized and Unrealized Gain (Loss) on Commodity Derivative Contracts Not Designated as Hedging Instruments Realized and Unrealized Gain (Loss) on Commodity Derivative Contracts Not Designated as Hedging Instruments Total Realized and Unrealized Gain (Loss) on Commodity Derivative Contracts Not Designated as Hedging Instruments Realized gain (loss) derivative contracts not designated as hedging instruments Realized gain (loss) derivative contracts not designated as hedging instruments Realized gain (loss) derivative contracts not designated as hedging instruments Unrealized gain (loss) derivative contracts not designated as hedging instruments Unrealized gain (loss) derivative contracts not designated as hedging instruments Unrealized gain (loss) derivative contracts not designated as hedging instruments Total gain (loss) on commodity derivative instruments Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Anti-dilutive shares not included in diluted common share outstanding (in shares) Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Weighted-average basic common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Basic Potential number of shares issuable upon excerise of in-the-money stock options under the Long-term Stock Incentive Plan Incremental Common Shares Attributable to Dilutive Effect of Share-based Payment Arrangements Average diluted common shares outstanding (in shares) Weighted Average Number of Shares Outstanding, Diluted Components of basic and diluted shares used in EPS Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Employee Benefits Pension and Other Postretirement Benefits Disclosure [Text Block] Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value Accounts receivable, net Accounts Receivable, Net, Current Income taxes receivable Income Taxes Receivable, Current Deferred income taxes - current Deferred Tax Assets, Net, Current Prepaid expenses and other Prepaid Expense and Other Assets, Current Current assets of discontinued operations held for sale Assets of Disposal Group, Including Discontinued Operation, Current Midstream field services Midstream Field Services Property Natural gas gathering systems and treating plants. Material and supplies Inventory, Drilling, Noncurrent Total Property, Plant and Equipment Property, Plant and Equipment, Gross Midstream field services Accumulated Depreciation Midstream Field Services Accumulated depreciation of natural gas gathering systems and treating plants. Net Property, Plant and Equipment Disposal Group, Including Discontinued Operation, Property, Plant, and Equipment, Net Investment in unconsolidated affiliates Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures Other noncurrent assets Other Assets, Noncurrent Noncurrent assets of discontinued operations held for sale Assets of Disposal Group, Including Discontinued Operation, Noncurrent Accounts payable and accrued expenses Disposal Group, Including Discontinued Operation, Accounts Payable and Accrued Liabilities, Current Accrued income taxes Accrued Income Taxes, Current Production and property taxes Accrual for Taxes Other than Income Taxes, Current Interest payable Interest Payable, Current Current liabilities of discontinued operations held for sale Liabilities of Disposal Group, Including Discontinued Operation, Current Long-term debt Long-term Debt, Excluding Current Maturities Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Asset retirement obligations Asset Retirement Obligations, Noncurrent Other long-term liabilities Other Liabilities, Noncurrent Noncurrent liabilities of discontinued operations held for sale Liabilities of Disposal Group, Including Discontinued Operation, Noncurrent Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis of Presentation of Interim Consolidated Financial Statements Organization, Consolidation and Presentation of Financial Statements Disclosure [Text Block] Maximum Forecasted Production Covered By Derivatives Maximum Forecasted Production Covered By Derivatives Potential maximum amount of forecasted production covered by derivative contracts. Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Derivative Liability, Notional Amount Derivative Liability, Notional Amount Effective interest Rate Before Impact of Derivatives Effective interest Rate Before Impact of Derivatives Effective interest Rate Before Impact of Derivatives Restructuring Costs Restructuring and Related Activities Disclosure [Text Block] Segment Reporting [Abstract] Summary of operating results by line of business Schedule of Segment Reporting Information, by Segment [Table Text Block] Debt Outstanding Schedule of Debt [Table Text Block] Continuing cash flows related to midstream business held for sale Continuing Cash Flows To Business Held For Sale Continuing Cash Flows To Business Held For Sale Property, plant and equipment, including dry exploratory well expense Payments to Acquire Oil and Gas Property and Equipment Measurement Basis [Axis] Measurement Basis [Axis] Fair Value Measurement [Domain] Fair Value Measurement [Domain] Estimate of Fair Value Measurement [Member] Estimate of Fair Value Measurement [Member] Reported Value Measurement [Member] Reported Value Measurement [Member] Long-term Debt, Fair Value Long-term Debt, Fair Value Cash and Cash Equivalents, at Carrying Value Checks outstanding in excess of cash balances Bank Overdrafts Fair Value Measurements Fair Value Disclosures [Text Block] Restructuring and Related Activities [Abstract] Estimated restructuring costs Restructuring and Related Cost, Expected Cost Restructuring and Related Cost, Incurred Cost Restructuring and Related Cost, Incurred Cost Derivative Volumes and Average Prices Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Schedule of Interest Rate Derivatives Schedule of Interest Rate Derivatives [Table Text Block] Fair Values of Derivatives by Balance Sheet Location Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Effects of Derivative Transactions Derivative Instruments, Gain (Loss) [Table Text Block] Statement [Table] Statement [Table] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Statement [Line Items] Statement [Line Items] ASSETS Assets [Abstract] Current Assets Assets, Current [Abstract] Fair value of derivative contracts Derivative Instruments and Hedges, Assets Gas, oil and NGL inventories at lower of average cost or market Energy Related Inventory Current assets of discontinued operations held for sale Total Current Assets Assets, Current Property, Plant and Equipment (successful efforts method for gas and oil properties) Property, Plant and Equipment, Net [Abstract] Proved properties Proved Oil and Gas Property, Successful Effort Method Unproved properties Unproved Oil and Gas Property, Successful Effort Method Midstream Marketing and resources Property, Plant and Equipment, Other, Gross Less Accumulated Depreciation, Depletion and Amortization Oil and Gas Property, Successful Effort Method, Accumulated Depreciation, Depletion Amortization and Impairment [Abstract] Less Accumulated Depreciation, Depletion and Amortization Depreciation, Depletion and Amortization, Nonproduction [Abstract] Exploration and production Oil and Gas Property, Successful Effort Method, Accumulated Depreciation, Depletion and Amortization Midstream Marketing and resources Property, Plant and Equipment, Other, Accumulated Depreciation Total Accumulated Depreciation, Depletion and Amortization Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Net Property, Plant and Equipment Property, Plant and Equipment, Net Fair value of derivative contracts Derivative Instruments and Hedges, Noncurrent Restricted cash Restricted Cash and Cash Equivalents Noncurrent assets of discontinued operations held for sale TOTAL ASSETS Assets Current Liabilities Liabilities, Current [Abstract] Accounts payable and accrued expenses Accounts Payable and Accrued Liabilities, Current Fair value of derivative contracts Derivative Instruments and Hedges, Liabilities Deferred income taxes Deferred Tax Liabilities, Net, Current Current liabilities of discontinued operations held for sale Total Current Liabilities Liabilities, Current Deferred income taxes Fair value of derivative contracts Derivative Liability, Noncurrent Noncurrent liabilities of discontinued operations held for sale Commitments and contingencies Commitments and Contingencies Common stock - par value $0.01 per share; 500.0 million shares authorized; 180.9 million and 179.7 million shares issued, respectively Common Stock, Value, Issued Treasury stock - 0.8 million and 0.4 million shares, respectively Treasury Stock, Value Additional paid-in capital Additional Paid in Capital, Common Stock Retained earnings Retained Earnings (Accumulated Deficit) Accumulated other comprehensive loss Accumulated Other Comprehensive Income (Loss), Net of Tax Total Common Shareholders' Equity Stockholders' Equity Attributable to Parent Noncontrolling interest Stockholders' Equity Attributable to Noncontrolling Interest Total Equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest TOTAL LIABILITIES AND EQUITY Liabilities and Equity Financial Instrument [Axis] Financial Instrument [Axis] Financial Instruments [Domain] Financial Instruments [Domain] Fair Value Hierarchy [Domain] Fair Value, Inputs, Level 2 [Member] Measurement Frequency [Axis] Segments [Axis] Segments [Domain] Derivative Liability, Fair Value, Gross Liability Operations by Line of Business Segment Reporting Disclosure [Text Block] Liabilities Settled Through Divestiture Liabilities Settled Through Divestiture Liabilities Settled Through Divestiture Asset Retirement Obligation, Current Asset Retirement Obligation, Current ARO Liability [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] ARO liability, Beginning Balance Asset Retirement Obligation Accretion Asset Retirement Obligation, Accretion Expense Revisions Asset Retirement Obligation, Revision of Estimate Liabilities settled Asset Retirement Obligation, Liabilities Settled ARO liability, Ending Balance New accounting pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Derivative Contracts Derivative Instruments and Hedging Activities Disclosure [Text Block] Reconciliation of QEP Energy's restructuring cost Restructuring and Related Costs [Table Text Block] Income Statement Impact Of Discontinued Operations [Table Text Block] Income Statement Impact Of Discontinued Operations [Table Text Block] Income Statement Impact Of Discontinued Operations [Table Text Block] Assets And Liabilities Of Discontinued Operations [Table Text Block] Assets And Liabilities Of Discontinued Operations [Table Text Block] Assets And Liabilities Of Discontinued Operations [Table Text Block] Schedule of calculated fair value of options granted and major assumptions used Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Summary of stock option transactions under the terms of LTSIP Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Restricted Share Units Activity Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity [Table Text Block] Schedule of Performance Share Units Activity Schedule of Other Share-based Compensation, Activity [Table Text Block] Total Revenues Net income attributable to QEP Net Income (Loss) Attributable to Parent Earnings Per Share, Basic Earnings Per Share, Basic Earnings Per Share, Diluted Earnings Per Share, Diluted Business Acquisition, Pro Forma Revenue Business Acquisition, Pro Forma Revenue Business Acquisition, Pro Forma Net Income (Loss) Business Acquisition, Pro Forma Net Income (Loss) Business Acquisition, Pro Forma Earnings Per Share, Basic Business Acquisition, Pro Forma Earnings Per Share, Basic Business Acquisition, Pro Forma Earnings Per Share, Diluted Business Acquisition, Pro Forma Earnings Per Share, Diluted Statement of Cash Flows [Abstract] OPERATING ACTIVITIES Net Cash Provided by (Used in) Operating Activities [Abstract] Net income attributable to noncontrolling interest Adjustments to reconcile net income to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation, depletion and amortization Depreciation, Depletion and Amortization Deferred income taxes Deferred Income Tax Expense (Benefit) Impairment Asset Impairment Charges Equity-based compensation Share-based Compensation Amortization of debt issuance costs and discounts Amortization of Financing Costs and Discounts Net loss (gain) from asset sales Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Income from unconsolidated affiliates Distributions from unconsolidated affiliates and other Proceeds from Equity Method Investment, Dividends or Distributions Unrealized (gain) loss on derivative contracts Unrealized Gain (Loss) on Derivatives Changes in operating assets and liabilities Increase (Decrease) in Operating Capital Net Cash Provided by Operating Activities Net Cash Provided by (Used in) Operating Activities, Continuing Operations INVESTING ACTIVITIES Net Cash Provided by (Used in) Investing Activities [Abstract] Property acquisitions Payments to Acquire Oil and Gas Property Property, plant and equipment, including dry exploratory well expense Payments to Acquire Oil and Gas Equipment Proceeds from disposition of assets Proceeds from Sale of Oil and Gas Property and Equipment Acquisition deposit held in escrow Escrow Deposits Related to Property Sales Other investing activities Payments for (Proceeds from) Other Investing Activities Net Cash Used in Investing Activities Net Cash Provided by (Used in) Investing Activities, Continuing Operations FINANCING ACTIVITIES Net Cash Provided by (Used in) Financing Activities [Abstract] Checks outstanding in excess of cash balances Increase (Decrease) in Outstanding Checks, Financing Activities Long-term debt issued Long-term debt issuance costs paid Payments of Debt Issuance Costs Proceeds from credit facility Proceeds from Lines of Credit Repayments of credit facility Repayments of Lines of Credit Treasury stock repurchases Payments for Repurchase of Common Stock Net proceeds from the issuance of QEP Midstream common units Proceeds from Issuance of Common Limited Partners Units Other capital contributions Proceeds from Other Equity Dividends paid Payments of Ordinary Dividends, Common Stock Excess tax (provisions) benefit on equity-based compensation Excess Tax Benefit from Share-based Compensation, Financing Activities Distribution to noncontrolling interest Payments to Noncontrolling Interests Net Cash Provided by Financing Activities Net Cash Provided by (Used in) Financing Activities, Continuing Operations Change in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Beginning cash and cash equivalents Ending cash and cash equivalents Supplemental Disclosures: Supplemental Cash Flow Elements [Abstract] Cash paid for interest, net of capitalized interest Interest Paid, Net Cash paid for income taxes Income Taxes Paid, Net Non-cash investing activities Noncash Investing and Financing Items [Abstract] Change in capital expenditure accrual balance Capital Expenditures Incurred but Not yet Paid Statement of Comprehensive Income [Abstract] Other comprehensive income (loss), tax Other Comprehensive Income (Loss), Tax [Abstract] Tax expense (benefit) on gains (losses) on changes in unrealized fair value of derivatives designated as cash flow hedges Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Pension and other postretirement plans adjustments: Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax [Abstract] Tax expense (benefit) on net unamortized gain (loss) incurred Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net Unamortized Gain (Loss) Arising During Period, Tax Tax expense (benefit) on prior service cost incurred Other Comprehensive Income (Loss), Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service (Cost) Credit, Tax Schedule of Equity-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] Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis] Award Type [Axis] Share-based Compensation Arrangements by Share-based Payment Award, Award Type and Plan Name [Domain] Equity Award [Domain] Stock Options [Member] Employee Stock Option [Member] Restricted Stock [Member] Restricted Stock [Member] Performance Share Units [Member] Performance Share Units [Member] Incremental common shares attributable to performance share units. 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] Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant Options Outstanding [RollForward] Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] 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, Net of Forfeitures 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 Outstanding Ending Balance (in shares) Options Excercisable (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Unvested Options (in shares) Share Based Compensation Arrangement By Share Based Payment Award Options Unvested Number The number of shares into which unvested stock options outstanding as of the balance sheet date can be currently converted under the option plan. Total fair value of stock that vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value Shares Outstanding [Roll Forward] Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward] Balance, beginning (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 Vested and paid out (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 Vested and canceled (in shares) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments other than Options, Canceled in the Period Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments other than Options, Canceled in the Period Balance, Ending (in shares) Weighted-Average Price [Abstract] Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] Weighted-Average Price, beginning (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted-Average Price, Granted (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Weighted-Average Price, Exercised (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted-Average Price, Forfeited (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Weighted-Average Price, Forfeited (in dollars per share) Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Weighted-Average Price, Ending (in dollars per share) Weighted-Average Price, Options Excercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted-Average Price, Unvested Options hare Based Compensation Arrangement By Share Based Payment Award Options Unvested Weighted Average Exercise Price The weighted-average price as of the balance sheet date for unvested stock options. Weighted-Average Price, beginning balance (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, 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, Vested and paid out (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, Vested and canceled (in dollars per share) Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments other than Options, Canceled in the Period, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments other than Options, Canceled in the Period, Weighted Average Grant Date Fair Value Weighted-Average Price, Ending Balance (in dollars per share) Weighted-Average Remaining Contractual Term, Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value, Outstanding Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Weighted-Average Remaining Contractual Term, Options Excercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value, Options Excercisable Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Weighted-Average Remaining Contractual Term, Unvested Options Share Based Compensation Arrangement By Share Based Payment Award Options Unvested Weighted Average Remaining Contractual Term The weighted average period between the balance sheet date and expiration for all unvested portions of options outstanding under the plan, which may be expressed in a decimal value for number of years. Aggregate Intrinsic Value, Unvested Options Sharebased Compensation Arrangement By Sharebased Payment Award Options Unvested Intrinsic Value1 The total dollar difference between fair values of the underlying shares reserved for issuance and exercise prices of unvested portions of options outstanding and currently exercisable under the option plan as of the balance sheet date. Intrinsic value of options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value Unrecognized compensation cost Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized Weighted-average period for recognition of compensation costs Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition Vesting period (in years) Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] QEP Marketing and Other [Member] QEP Marketing and Other [Member] QEP Marketing Company (QEP Marketing) markets affiliate and third-party natural gas and oil, provides risk-management services, and owns and operates an underground gas-storage reservoir. Other includes other marketing businesses. Elimination [Member] Intersegment Eliminations [Member] Major Customers [Axis] Customer [Axis] Name of Major Customer [Domain] Customer [Domain] Unaffiliated customers [Member] Unaffiliated customers [Member] Unaffiliated is a party that, indirectly through one or more intermediaries, controls, is controlled by, or is under common control with the entity. Affiliated customers [Member] Affiliated Entity [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Revenues Oil and Gas Revenue [Abstract] Operating expenses Operating Expenses [Abstract] Production and property taxes Other operating expenses Other Expenses Net gain (loss) from asset sales Operating income (loss) Realized and unrealized gains (losses) on derivative contracts Gain on Derivative Instruments, Pretax Interest and other income Income from unconsolidated affiliates Income (Loss) from Equity Method Investments Continuing Operations Income (Loss) from Equity Method Investments Continuing Operations Income (loss) before income taxes Income (Loss) from Continuing Operations before Income Taxes, Extraordinary Items, Noncontrolling Interest Income taxes Income Tax Expense (Benefit) Income from continuing operations Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Discontinued operations, net of income tax Assets Income Statement [Abstract] REVENUES Revenues [Abstract] Gas sales Natural Gas Production Revenue Oil sales Oil and Condensate Revenue OPERATING EXPENSES Gas, oil and NGL transportation and other handling costs Gathering and other expense Exploration expenses Exploration Expense Impairment Realized and unrealized gains (losses) on derivative contracts (See Note 8) INCOME FROM CONTINUING OPERATIONS BEFORE INCOME TAXES Income tax provision NET INCOME FROM CONTINUING OPERATIONS NET INCOME ATTRIBUTABLE TO QEP Earnings Per Common Share Attributable to QEP Weighted-average common shares outstanding Weighted Average Number of Shares Outstanding, Diluted [Abstract] Used in basic calculation (in shares) Used in diluted calculation (in shares) Dividends per common share (in dollars per share) Common Stock, Dividends, Per Share, Cash Paid Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Schedule of Share-based Compensation Arrangements by Share-based Payment Award [Table] Award Type [Axis] Equity Award [Domain] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Fair value of options at grant date Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value Risk-free interest rate (in hundredths) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate, Minimum Expected price volatility (in hundredths) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate, Minimum Expected dividend yield (in hundredths) Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Expected life in years Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Line of Credit [Member] Senior Notes Due 2016 [Member] Senior Notes Due 2018 [Member] Senior Notes Due 2020 [Member] Senior Notes Due 2020 [Member] Senior Notes Due 2020. Senior Notes Due 2021 [Member] Senior Notes Due 2021 [Member] Senior Notes Due 2021. Senior Notes Due 2022 [Member] Senior Notes Due 2022 [Member] Senior Notes Due 2022. 5.25% Senior Notes Due 2023 [Member] 5.25% Senior Notes Due 2023 [Member] 5.25% Senior Notes Due 2023 [Member] Long-term Debt Long-term Debt Fair value of financial assets and liabilities Fair Value Measurements, Recurring and Nonrecurring [Table Text Block] Fair value and related carrying amount of certain financial instruments Fair Value, by Balance Sheet Grouping [Table Text Block] Document and Entity Information [Abstract] Document and Entity Information [Abstract] 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 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 Pension and Other Postretirement Benefit Costs Schedule of Net Benefit Costs [Table Text Block] Other comprehensive (loss) income, net of tax: Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract] Reclassification of previously deferred derivative gains(1) Amortization of net actuarial loss Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net (Gain) Loss, Net of Tax Amortization of prior service cost Other Comprehensive Income (Loss), Amortization Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, for Net Prior Service (Cost) Credit, Net of Tax Total pension and other postretirement plans adjustments Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax Other comprehensive loss Other Comprehensive Income (Loss), Net of Tax Comprehensive (loss) income attributable to QEP Comprehensive Income (Loss), Net of Tax, Attributable to Parent Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] Business Combination, Separately Recognized Transactions [Table Text Block] Business Combination, Separately Recognized Transactions [Table Text Block] Business Acquisition, Pro Forma Information [Table Text Block] Business Acquisition, Pro Forma Information [Table Text Block] Oil Sales [Member] Natural Gas Sales [Member] Derivative Contract Year [Axis] Derivative Contract Year [Axis] Tabular presentation of derivative instruments by year of contract. Derivative Contract Year [Domain] Derivative Contract Year [Domain] Tabular presentation of derivative instruments by year of contract. 2014 [Member] Year 2014 [Member] Year 2014 [Member] 2015 [Member] Year 2015 [Member] Year 2015 [Member] Year2016 [Member] Year2016 [Member] Year2016 [Member] Swap [Member] Swap [Member] Energy Commodities Exchange [Axis] Energy Commodities Exchange [Axis] Exchange where various commodities and derivatives products are traded Energy Commodities Exchange Abbreviation [Domain] Energy Commodities Exchange Abbreviation [Domain] Exchange abbreviation where various commodities and derivatives products are traded. NYMEX WTI less ICE Brent Differential [Member] NYMEX WTI less ICE Brent Differential [Member] NYMEX WTI less ICE Brent Differential [Member] NYMEX [Member] NYMEX [Member] Energy Commodities Exchange Abbreviation IFNPCR [Member] IFNPCR [Member] Energy Commodities Exchange Abbreviation NYMEX WTI [Member] NYMEX WTI [Member] Energy Commodities Exchange Abbreviation NYMEX WTI less LLS Differential [Member] NYMEX WTI less LLS Differential [Member] NYMEX WTI less LLS Differential [Member] BRENT ICE [Member] BRENT ICE [Member] BRENT ICE [Member] Purchased Gas and Oil Expense [Member] Purchased Gas and Oil Expense [Member] Derivative contracts recognized in income as purchased gas and oil expense. Derivatives, Fair Value [Line Items] Derivatives, Fair Value [Line Items] Year Derivative Contract Year The contract year for the derivative contract. Index Derivative, Underlying Basis Total Volume (in Bcf, Mbbl, millions of gallons, millions of MMBtu) Derivative, Nonmonetary Notional Amount Average Swap price per unit ($ per unit) Underlying, Derivative Asset Asset retirement obligations roll forward Schedule of Change in Asset Retirement Obligation [Table Text Block]