Other Expense [Abstract] Other Expense [Abstract] Transportation commitment charges Transportation Commitment Loss Transportation Commitment Loss Above market and idle drilling and well services equipment charges Idle Rig Expense Expenses from idle and terminate rigs. Terminated drilling rig contract charges Terminated Drilling Rig Expense Terminated Drilling Rig Expense Third-party loss from vertical integration services Third-party loss from vertical integration services Third-party loss from vertical integration services (b) Restructuring Charges Restructuring and Related Cost, Incurred Cost Inventory valuation charges Tangible Asset Impairment Charges Other Other General Expense Contingency and environmental accrual adjustments Change In Accrual For Legal And Environmental Contingencies Change in Accrual for Legal and Environmental Contingencies. Total other expense Other Nonoperating Expense GrossRevenuesIncludedInThirdPartyLossFromVerticalIntegrationServices GrossRevenuesIncludedInThirdPartyLossFromVerticalIntegrationServices GrossRevenuesIncludedInThirdPartyLossFromVerticalIntegrationServices GrossExpensesIncludedInThirdPartyLossFromVerticalIntegrationServices GrossExpensesIncludedInThirdPartyLossFromVerticalIntegrationServices GrossExpensesIncludedInThirdPartyLossFromVerticalIntegrationServices Interest and Other Income [Abstract] Interest And Other Income Other Income and Other Expense Disclosure [Text Block] Earnings Per Share [Abstract] Reconciliation of Basic Weighted Average Shares to Diluted Weighted Average Shares [Table] Reconciliation of Basic Weighted Average Shares to Diluted Weighted Average Shares [Table] Reconciliation of Basic Weighted Average Shares to Diluted Weighted Average Shares [Table] Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Performance Shares [Member] Performance Shares [Member] Stock Options [Member] Employee Stock Option [Member] Weighted Average Number of Shares Outstanding Reconciliation [Line Items] Weighted Average Number of Shares Outstanding Reconciliation [Line Items] Weighted Average Number of Shares Outstanding Reconciliation [Line Items] Basic Weighted Average Number of Shares Outstanding, Basic Convertible senior notes dilution Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Diluted Weighted Average Number of Shares Outstanding, Diluted Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Debt Disclosure [Abstract] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Five Point Eight Seven Five Percent Senior Notes Due Two Thousand Sixteen [Member] Five Point Eight Seven Five Percent Senior Notes Due Two Thousand Sixteen [Member] Five Point Eight Seven Five Percent Senior Notes Due Two Thousand Sixteen [Member] Six Point Six Five Percent Senior Notes Due Two Thousand Seventeen [Member] Six Point Six Five Percent Senior Notes Due Two Thousand Seventeen [Member] Six Point Six Five Percent Senior Notes Due Two Thousand Seventeen [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Maximum Borrowing Capacity Line of Credit Facility, Maximum Borrowing Capacity Outstanding borrowing Long-term Line of Credit Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Senior Notes Senior Notes Exploratory Cost Disclosure [Abstract] -- None. No documentation exists for this element. -- Capitalized Exploratory Well and Project Activity [Table] Capitalized Exploratory Well and Project Activity [Table] Capitalized Exploratory Well and Project Activity [Table] Project [Axis] Project [Axis] Project [Domain] Project [Domain] Capitalized exploratory costs [Member] Capitalized exploratory costs [Member] Capitalized exploratory costs [Member] Statement [Line Items] Statement [Line Items] Beginning capitalized exploratory costs Capitalized Exploratory Well Costs Additions to exploratory costs pending the determination of proved reserves Capitalized Exploratory Well Cost, Additions Pending Determination of Proved Reserves Reclassification due to determination of proved reserves Reclassification to Well, Facilities, and Equipment Based on Determination of Proved Reserves Capitalized Exploratory Well Cost Assets Disposition Capitalized Exploratory Well Cost Assets Disposition Capitalized Exploratory Well Cost Assets Disposition Exploratory well costs charged to exploration expense Capitalized Exploratory Well Cost, Charged to Expense Ending capitalized exploratory costs Net Income Per Share Earnings Per Share [Text Block] Projects with Exploratory Well Costs Capitalized for More than One Year [Table] Projects with Exploratory Well Costs Capitalized for More than One Year [Table] Colorado [Member] Colorado [Member] Colorado [Member] Eagle Ford Shale [Member] Eagle Ford Shale [Member] Eagle Ford Shale [Member] Nuna [Member] Nuna [Member] Nuna [Member] Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] Projects with Exploratory Well Costs Capitalized for More than One Year [Line Items] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative [Table] Derivative [Table] Hedging Designation [Axis] Hedging Designation [Axis] Hedging Designation [Domain] Hedging Designation [Domain] Not Designated as Hedging Instrument [Member] Not Designated as Hedging Instrument [Member] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Derivatives - Current [Member] Derivative Current [Member] Derivative Current [Member] Derivative Instrument Risk [Axis] Derivative Instrument [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] Commodity Price Derivatives [Member] Commodity Contract [Member] Interest Rate Derivatives [Member] Interest Rate Contract [Member] Income Statement Location [Axis] Income Statement Location [Axis] Income Statement Location [Domain] Income Statement Location [Domain] Derivative Gains (Losses), Net [Member] Derivative Gains Losses [Member] Derivative gains (losses) [Member] Derivative [Line Items] Derivative [Line Items] Derivative gains, net Gain (Loss) on Derivative Instruments, Net, Pretax Income Tax Disclosure [Abstract] Current income taxes Current Income Tax Expense (Benefit) Deferred income taxes Deferred Income Tax Expense (Benefit) Income tax benefit (provision) Income Tax Expense (Benefit) Effective Tax Rate Effective Income Tax Rate Reconciliation, Percent Statutory Tax Rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Unrecognized tax benefit recognized in period Unrecognized tax benefit recognized in period Unrecognized tax benefit recognized in period Unrecognized Tax Benefits Unrecognized Tax Benefits Asset Retirement Obligation [Abstract] Asset Retirement Obligation [Table] Asset Retirement Obligation [Table] Asset Retirement Obligation [Table] Operating Activities [Axis] Operating Activities [Axis] Operating Activities [Domain] Operating Activities [Domain] Discontinued Operations [Member] Discontinued Operations [Member] Asset Retirement Obligation [Line Items] Asset Retirement Obligation [Line Items] [Line Items] for Asset Retirement Obligation [Table] Asset Retirement Obligation Accretion Expense From Discontinued Operations Included in Asset Retirement Obligation Balance At End of Period Asset Retirement Obligation Accretion Expense From Discontinued Operations Included in Asset Retirement Obligation Balance At End of Period Asset Retirement Obligation Accretion Expense From Discontinued Operations Included in Asset Retirement Obligation Balance At End of Period Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Beginning asset retirement obligations Asset Retirement Obligation AssetRetirementObligationLiabilitiesAcquiredInBusinessCombination AssetRetirementObligationLiabilitiesAcquiredInBusinessCombination AssetRetirementObligationLiabilitiesAcquiredInBusinessCombination Asset Retirement Obligation, Liabilities Incurred Asset Retirement Obligation, Liabilities Incurred Changes in estimates Asset Retirement Obligation, Revision of Estimate Disposition of wells Asset Retirement Obligations Written Off Through Disposition Of Wells Asset Retirement Obligations Written Off Through Disposition of Wells. Liabilities settled Asset Retirement Obligation, Liabilities Settled Accretion of discount from continuing operations Asset Retirement Obligation, Accretion Expense Accretion of discount from integrated services Asset Retirement Obligation Accretion Expense Integrated Services Asset Retirement Obligation Accretion Expense related to Integrated Services Ending asset retirement obligations Asset retirement obligations, current portions Asset Retirement Obligation, Current Income Taxes Income Tax Disclosure [Text Block] Fair Value Disclosures [Abstract] Schedule of assets and liabilities measured at fair value on a recurring basis Fair Value, Assets Measured on Recurring Basis [Table Text Block] Fair Value Measurements, Nonrecurring [Table Text Block] Fair Value Measurements, Nonrecurring [Table Text Block] Fair Value of Assets Classified as Held for Sale [Table Text Block] Fair Value of Assets Classified as Held for Sale [Table Text Block] Fair Value of Assets Classified as Held for Sale [Table Text Block] Schedule of carrying values and financial instruments not carried at fair value Fair Value, by Balance Sheet Grouping [Table Text Block] Cash, Cash Equivalents and Investments [Table Text Block] Cash, Cash Equivalents and Investments [Table Text Block] Fair Value of Assets Classified as Held for Sale [Abstract] Fair Value of Assets Classified as Held for Sale [Abstract] Fair Value Measurements, Recurring and Nonrecurring [Table] Fair Value Measurements, Recurring and Nonrecurring [Table] Long Lived Assets Held-for-sale by Asset Type [Axis] Long Lived Assets Held-for-sale by Asset Type [Axis] Long Lived Assets Held-for-sale, Name [Domain] Long Lived Assets Held-for-sale, Name [Domain] Hugoton field [Member] Hugoton field [Member] Hugoton field [Member] Barnett Shale Field [Member] Barnett Shale Field [Member] Barnett Shale Field [Member] Pioneer Alaska [Member] Pioneer Alaska [Member] Pioneer Alaska [Member] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] Fair Value of Asset Group Fair Value of Asset Group Fair Value of Asset Group Exploratory Costs Oil and Gas Exploration and Production Industries Disclosures [Text Block] Statement of Stockholders' Equity [Abstract] Dividends declared per share Common Stock, Dividends, Per Share, Declared Organization, Consolidation and Presentation of Financial Statements [Abstract] Basis Of Presentation Basis of Presentation and Significant Accounting Policies [Text Block] Capitalized exploratory well and project activity Capitalized Exploratory Well and Project Activity [Table Text Block] Capitalized Exploratory Well and Project Activity [Table Text Block] Capitalized Exploratory Costs And The Number Of Projects For Which Exploratory Costs Have Been Capitalized Schedule of Projects with Exploratory Well Costs Capitalized for More than One Year [Table Text Block] Document And Entity Information [Abstract] Document and Entity Information [Abstract] Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol 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 Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Range [Axis] Range [Axis] Range [Domain] Range [Domain] Minimum [Member] Minimum [Member] Maximum [Member] Maximum [Member] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Scenario, Forecast [Member] Scenario, Forecast [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event [Member] Subsequent Event [Member] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Efs Midstream [Member] Efs Midstream [Member] EFS Midstream [Member] Pioneer Southwest [Member] Pioneer Southwest [Member] Relating to Pioneer Southwest. Disposal Group Name [Axis] Disposal Group Name [Axis] Disposal Groups, Including Discontinued Operations, Name [Domain] Disposal Group Name [Domain] Subsequent Event [Line Items] Subsequent Event [Line Items] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Derivatives - Noncurrent [Member] Derivative Noncurrent [Member] Derivative Noncurrent [Member] Total derivatives, Asset, Gross Derivative Asset, Fair Value, Gross Asset Derivative Liability, Fair Value, Gross Liability Derivative Liability, Fair Value, Gross Liability Derivative Assets Offset In Balance Sheet Derivative Assets Offset In Balance Sheet Derivative Assets Offset In Balance Sheet Derivative Liabilities Offset In Balance Sheet Derivative Liabilities Offset In Balance Sheet Derivative Liabilities Offset In Balance Sheet Derivative Assets, Current Derivative Asset, Current Derivative Assets, Noncurrent Derivative Asset, Noncurrent Derivative Asset, Fair Value, Net Derivative Asset, Fair Value, Amount Not Offset Against Collateral Derivative Liabilities, Current Derivative Liability, Current Derivative Liabilities, Noncurrent Derivative Liability, Noncurrent Derivative Liability, Fair Value, Net Derivative Liability, Fair Value, Amount Not Offset Against Collateral Acquisitions and Divestitures [Abstract] Acquisitions and Divestitures [Abstract] Schedule of Disposal Groups, Including Discontinued Operations, Income Statement, Balance Sheet and Additional Disclosures [Table Text Block] Disposal Groups, Including Discontinued Operations [Table Text Block] Discontinued Operations Assets and Liabilities Included in Assets and Liabilities Held for Sale [Table Text Block] Discontinued Operations Assets and Liabilities Included in Assets and Liabilities Held for Sale [Table Text Block] [Table Text Block] for Discontinued Operations Assets and Liabilities Included in Assets and Liabilities Held for Sale [Table] Schedule of components of other expense Schedule of Components of Other Expense Text Block Schedule of Components of Other Expense Text Block Income tax (provisions) benefits attributable to income from continuing operations Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Statement of Financial Position [Abstract] ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents, at Carrying Value Cash and Cash Equivalents, at Carrying Value Short-term Investments Short-term Investments Accounts receivable: Accounts Receivable, Net, Current [Abstract] Trade, net Accounts Receivable, Net, Current Due from affiliates Due from Affiliate, Current Income taxes receivable Income Taxes Receivable, Current Inventories Inventory, Net Prepaid expenses Prepaid Expense, Current Deferred income taxes Deferred Tax Assets, Net of Valuation Allowance, Current Assets held for sale Disposal Group, Including Discontinued Operation, Assets Other current assets: Other Assets, Current 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Property, Plant and Equipment, Net Other assets: Other Assets, Noncurrent [Abstract] Investment in unconsolidated affiliate Equity Method Investments Derivative Assets, Noncurrent Other, net Other Assets, Noncurrent Assets, Total Assets LIABILITIES AND STOCKHOLDERS' EQUITY Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable: Accounts Payable, Current [Abstract] Trade Accounts Payable, Trade, Current Due to affiliates Due to Affiliate, Current Interest payable Interest Payable, Current Income taxes payable Accrued Income Taxes, Current Current portion of long-term debt Long-term Debt, Current Maturities Deferred Tax Liabilities, Net, Current Deferred Tax Liabilities, Net, Current Liabilities held for sale Disposal Group, Including Discontinued Operation, Liabilities Other current liabilities: Other Liabilities, Current [Abstract] Derivative Liabilities, Current Other Other Liabilities, Current Total current liabilities Liabilities, Current Long-term Debt, Excluding Current Maturities Long-term Debt, Excluding Current Maturities Derivative Liabilities, Noncurrent Deferred income taxes Deferred Tax Liabilities, Net, Noncurrent Other liabilities Other Liabilities, Noncurrent Stockholders' equity: Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest [Abstract] Common stock, $.01 par value Common Stock, Value, Issued Additional paid-in capital Additional Paid in Capital Treasury stock at cost Treasury Stock, Value Retained earnings Retained Earnings (Accumulated Deficit) Total equity attributable to common stockholders Stockholders' Equity Attributable to Parent Noncontrolling interests in consolidating subsidiaries Stockholders' Equity Attributable to Noncontrolling Interest Total equity Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Commitments and contingencies Commitments and Contingencies Liabilities and Stockholders' Equity, Total Liabilities and Equity Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Table] Disposal Groups, Including Discontinued Operations [Table] 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] Assets of Disposal Group, Including Discontinued Operation, Current Disposal Group, Including Discontinued Operation, Assets, Current Disposal Group, Including Discontinued Operation, Property, Plant and Equipment Disposal Group, Including Discontinued Operation, Property, Plant and Equipment Assets held for sale Liabilities of Disposal Group, Including Discontinued Operation, Current Disposal Group, Including Discontinued Operation, Liabilities, Current Disposal Group, Including Discontinued Operation, Other Liabilities Disposal Group, Including Discontinued Operation, Other Liabilities Liabilities held for sale Statement of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Net income (loss) Net Income (Loss), Including Portion 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] Depletion, depreciation and amortization Depreciation, Depletion and Amortization Impairment of oil and gas properties Impairment of Oil and Gas Properties Impairment of Inventory and Other Property and Equipment Impairment of Inventory and Other Property and Equipment Impairment of Inventory and Other Property and Equipment Exploration expenses, including dry holes Dry Hole Expense The amount of noncash dry hole and unproved property abandonment expense during the period. Deferred income taxes Gain on disposition of assets, net Gain (Loss) on Disposition of Property Plant Equipment Accretion of discount on asset retirement obligations Discontinued operations Adjustment Income Loss From Discontinued Operations Net Of Tax Aggregate non-cash (income) loss and investing and financing cash flows from a disposal group. Interest expense Amortization of Financing Costs and Discounts Derivative related activity Noncash Gain Loss On Derivative Instruments Aggregate net noncash gain (loss) on commodity and interest rate derivative instruments. Amortization of stock-based compensation Amortization Stock Based Compensation Non-cash amortization of unvested stock-based compensation during the operating period. Other Other Operating Activities, Cash Flow Statement Change in operating assets and liabilities, net of effects from acquisitions and dispositions: Increase (Decrease) in Operating Capital [Abstract] Accounts receivable, net Increase (Decrease) in Accounts Receivable Income taxes receivable Increase (Decrease) in Income Taxes Receivable Inventories Increase (Decrease) in Inventories Prepaid expenses Increase (Decrease) in Prepaid Expense Other current assets Increase (Decrease) in Other Current Assets Accounts payable Increase (Decrease) in Accounts Payable Interest payable Increase (Decrease) in Interest Payable, Net Income taxes payable Increase (Decrease) in Income Taxes Payable Other current liabilities Increase (Decrease) in Other Current Liabilities Net cash provided by operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Proceeds from disposition of assets, net of cash sold Proceeds from Sale of Productive Assets Purchase of investment securities Payments to Acquire Held-to-maturity Securities Additions to oil and gas properties Payments to Acquire Oil and Gas Property Additions to other assets and other property and equipment, net Payments to Acquire Other Productive Assets Net cash used in investing activities Net Cash Provided by (Used in) Investing Activities Cash flows from financing activities: Net Cash Provided by (Used in) Financing Activities [Abstract] Borrowings under long-term debt Proceeds from Issuance of Long-term Debt Principal payments on long-term debt Repayments of Long-term Debt Proceeds from issuance of common stock, net of issuance costs Proceeds from Issuance of Common Stock Distributions to noncontrolling interests Payments of Distributions to Affiliates Payments of other liabilities Borrowings Payments of Other Liabilities Borrowings and payments of other liabilities Exercise of long-term incentive plan stock options and employee stock purchases Proceeds from Stock Options Exercised Purchases of treasury stock Payments for Repurchase of Common Stock Tax benefits related to stock-based compensation Excess Tax Benefit from Share-based Compensation, Financing Activities Payments of financing fees Payments of Financing Costs Dividends paid Payments of Dividends Net cash used in financing activities Net Cash Provided by (Used in) Financing Activities Net increase (decrease) in cash and cash equivalents Cash and Cash Equivalents, Period Increase (Decrease) Cash and cash equivalents, beginning of period Cash and cash equivalents, end of period Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic and Diluted, by Common Class, Including Two Class Method [Table] Continuing Operations [Member] Continuing Operations [Member] Statement Operating Activities Segment [Line Items] Statement Operating Activities Segment [Line Items] Statement Operating Activities Segment [Line Items] Income (loss) from continuing operations attributable to parent Income (Loss) from Continuing Operations Attributable to Parent Participating Securities, Distributed and Undistributed Earnings, Basic Participating Securities, Distributed and Undistributed Earnings (Loss), Basic Basic income (loss) from continuing operations attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Diluted income (loss) from continuing operations attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Diluted Asset Retirement Obligations Asset Retirement Obligation Disclosure [Text Block] Acquisitions and Divestitures [Table] Gain (loss) on sale of assets [Table] Gain (loss) on sale of assets [Table] Proceeds Received Current Year [Member] Proceeds Received Current Year [Member] Proceeds Received Current Year [Member] Proceeds To Be Received In Future Year [Member] [Member] Proceeds To Be Received In Future Year [Member] [Member] Proceeds To Be Received In Future Year [Member] Sendero [Member] Sendero [Member] Sendero [Member] Lease Contract through Year 2 [Member] Lease Contract through Year 2 [Member] Lease Contract through Year 2 [Member] Lease Contract for Year 3 [Member] Lease Contract for Year 3 [Member] Lease Contract for Year 3 [Member] Other Ownership Interests Name [Axis] Other Ownership Interests Name [Axis] Other Ownership Interests, Name [Domain] Other Ownership Interests, Name [Domain] Limited Partner Interest [Member] Limited Partner Interest [Member] Limited Partner Interest [Member] Wolfcamp [Member] Wolfcamp [Member] Wolfcamp [Member] Gaines Dawson [Member] Gaines Dawson [Member] Gaines Dawson [Member] West Panhandle [Member] West Panhandle [Member] West Panhandle [Member] Acquisitions and Divestitures [Line Items] Gain Loss on Sale of Assets [Line Items] Gain Loss on Sale of Assets [Line Items] Equity Method Investment, Ownership Percentage Equity Method Investment, Ownership Percentage Equity Method Investment, Net Sales Proceeds Equity Method Investment, Net Sales Proceeds Equity Method Investment, Realized Gain (Loss) on Disposal Equity Method Investment, Realized Gain (Loss) on Disposal Proceeds from Divestiture of Interest in Consolidated Subsidiaries Proceeds from Divestiture of Interest in Consolidated Subsidiaries Goodwill, Written off Related to Sale of Business Unit Goodwill, Written off Related to Sale of Business Unit Significant Acquisition and Disposal, Acquisition Costs or Sales Proceeds Disposal Group, Including Discontinued Operation, Consideration Maximum Payments From Related Party For Exploration Drilling And Completion Costs Maximum Payments From Related Party For Exploration Drilling And Completion Costs Maximum Payments From Related Party For Exploration Drilling And Completion Costs Payments From Related Party For Exploration Drilling And Completion Costs Percent Payments From Related Party For Exploration Drilling And Completion Costs Percent Payments From Related Party For Exploration Drilling And Completion Costs Percent Maximum Distribution Made to Limited Partner, Distributions Declared, Per Unit Maximum Distribution Made to Limited Partner, Distributions Declared, Per Unit Maximum Distribution Made to Limited Partner, Distributions Declared, Per Unit Joint Venture Investment Ownership Percentage Joint Venture Investment Ownership Percentage Investment in Joint Venture Marketing Gas contracts, in MMBTU [Member] Marketing Gas contracts, in MMBTU [Member] Marketing Gas contracts, in MMBTU [Member] Marketing gas contracts, price per MMBTU [Member] Marketing gas contracts, price per MMBTU [Member] Marketing gas contracts, price per MMBTU [Member] Marketing Oil contracts, in BBL [Member] Marketing Oil contracts, in BBL [Member] Marketing Oil contracts, in BBL [Member] Marketing oil contracts, price per BBL [Member] [Member] Marketing oil contracts, price per BBL [Member] Marketing oil contracts, price per BBL [Member] Trading Activity [Axis] Trading Activity [Axis] Trading Activity, by Type [Domain] Trading Activity, by Type [Domain] Basis Swap Contracts for Current Year [Member] Basis Swap Contracts for Current Year [Member] Basis Swap Contracts for Current Year Basis Swap Contracts for Year 2 [Member] Basis Swap Contracts for Year 2 [Member] Basis Swap Contracts for Year 2 Basis Swap Contracts for June 2015 [Member] Basis Swap Contracts for June 2015 [Member] Basis Swap Contracts for June 2015 [Member] Derivative, Nonmonetary Notional Amount Derivative, Nonmonetary Notional Amount Derivative, Swap Type, Average Fixed Price Derivative, Swap Type, Average Fixed Price Reconciliation of earnings attributable to common stockholders, basic and diluted Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] Reconciliation Of Basic To Diluted Weighted Average Common Shares Outstanding Schedule of Weighted Average Number of Shares [Table Text Block] Oil and Gas Production Type [Axis] Oil and Gas Production Type [Axis] Production Type [Domain] Production Type [Domain] Propane [Member] Propane [Member] Ethane [Member] Ethane [Member] Ethane [Member] NGL contract, in BBLS [Member] NGL contract, in BBLS [Member] NGL contract, in BBLS [Member] NGL contracts, price per BBL [Member] NGL contracts, price per BBL [Member] NGL contracts, price per BBL [Member] NGL contract, MMBtu Equivalent [Member] NGL contract, MMBtu Equivalent [Member] NGL contract, in MMBtu [Member] Collar Contracts With Short Puts for Current Year [Member] Collar Contracts With Short Puts for Current Year [Member] Collar Contracts With Short Puts for Current Year [Member] Collar Contracts With Short Puts for Year 2 [Member] Collar Contracts With Short Puts for Year 2 [Member] Collar Contracts With Short Puts for Year 2 [Member] Collar Contracts With Short Puts for Year 3 [Member] Collar Contracts With Short Puts for Year 3 [Member] Collar Contracts With Short Puts for Year 3 [Member] Collar Contracts for Current Year [Member] Collar Contracts for Current Year [Member] Collar Contracts for Current Year [Member] Collar Contracts for Year 2 [Member] Collar Contracts for Year 2 [Member] Collar Contracts for Year 2 [Member] Collar Contracts for Year 3 [Member] Collar Contracts for Year 3 [Member] Collar Contracts for Year 3 [Member] Swap Contracts for Current Year [Member] Swap Contracts for Current Year [Member] Swap Contracts for Current Year [Member] Swap Contracts for Year 2 [Member] Swap Contracts for Year 2 [Member] Swap Contracts for Year 2 [Member] Swap Contracts For Second Quarter of Year One [Member] Swap Contracts For Second Quarter of Year One [Member] Swap Contracts For Second Quarter of Year One [Member] Swap Contracts For Third Quarter of Year One [Member] Swap Contracts For Third Quarter of Year One [Member] Swap Contracts For Third Quarter of Year One [Member] Swap Contracts For Fourth Quarter of Year One [Member] Swap Contracts For Fourth Quarter of Year One [Member] Swap Contracts For Fourth Quarter of Year One [Member] Swap Contracts for Year 3 [Member] Swap Contracts for Year 3 [Member] Swap Contracts for Year 3 [Member] Derivative, by Nature [Axis] Derivative, by Nature [Axis] Derivative, Name [Domain] Derivative, Name [Domain] Short Put [Member] Short Put [Member] Short Put [Member] Derivative, Average Cap Price Derivative, Average Cap Price Derivative, Average Floor Price Derivative, Average Floor Price Derivative, Notional Amount, Price Per Unit Derivative, Notional Amount, Price Per Unit The price per unit of the notional amount of the derivative contract expressed in nonmonetary units. For example, the price per barrel specified in a fuel oil forward purchase contract. Common stock, par value Common Stock, Par or Stated Value Per Share Common stock, shares authorized Common Stock, Shares Authorized Common Stock, Shares, Issued Common Stock, Shares, Issued Treasury Stock, Shares Treasury Stock, Shares Presentation Consolidation, Policy [Policy Text Block] New Accounting Pronouncements, Policy [Policy Text Block] New Accounting Pronouncements, Policy [Policy Text Block] Investments, Debt and Equity Securities [Abstract] Schedule of Held-to-maturity Securities [Table] Schedule of Held-to-maturity Securities [Table] Debt Security [Axis] Debt Security [Axis] Major Types of Debt Securities [Domain] Major Types of Debt Securities [Domain] Cash and Cash Equivalents [Member] Cash and Cash Equivalents [Member] Commercial Paper [Member] Commercial Paper [Member] Corporate Bond Securities [Member] Corporate Bond Securities [Member] Bank Time Deposits [Member] Bank Time Deposits [Member] Schedule of Held-to-maturity Securities [Line Items] Schedule of Held-to-maturity Securities [Line Items] Cash, Cash Equivalents, and Short-term Investments Cash, Cash Equivalents, and Short-term Investments Commodity Derivatives [Member] Commodity [Member] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] Fair Value, Inputs, Level 1 [Member] Significant Other Observable Inputs (Level 2) [Member] Fair Value, Inputs, Level 2 [Member] Fair Value, Inputs, Level 3 [Member] Fair Value, Inputs, Level 3 [Member] Trading Securities, Fair Value Disclosure Trading Securities Investments, Fair Value Disclosure Investments, Fair Value Disclosure Derivative Asset, Fair Value, Net Deferred Compensation Plan Assets Deferred Compensation Plan Assets Assets, Fair Value Disclosure Assets, Fair Value Disclosure Liabilities, Fair Value Disclosure Financial and Nonfinancial Liabilities, Fair Value Disclosure Recurring Measurements, (Fair Value, Total) Recurring Measurements, (Fair Value, Net) Recurring Measurements, (Fair Value, Net). 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