Earnings Per Share [Abstract] 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] Operating Activities [Axis] Operating Activities [Axis] Operating Activities [Domain] Operating Activities [Domain] Segment, Continuing Operations [Member] Continuing Operations [Member] Discontinued Operations [Member] Discontinued 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, net of tax Income (Loss) from Continuing Operations Attributable to Parent Income (loss) as reported, Discontinued Operations Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest Income (loss) as reported Net Income (Loss) Attributable to Parent Participating basic earnings Participating Securities, Distributed and Undistributed Earnings Basic income (loss) attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Basic Reallocation of participating earnings Dilutive Securities, Effect on Basic Earnings Per Share Diluted income (loss) attributable to common stockholders Net Income (Loss) Available to Common Stockholders, Diluted Compensation and Retirement Disclosure [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] Type of Deferred Compensation [Axis] Type of Deferred Compensation [Axis] Type of Deferred Compensation, All Types [Domain] Type of Deferred Compensation, All Types [Domain] Stock Options [Member] Employee Stock Option [Member] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Share-based Compensation Arrangement by Share-based Payment Award [Line Items] Number of Shares, Outstanding at beginning of year Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number Number of Options awarded Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period Options exercised Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period Number of Shares, Outstanding and expected to vest at end of year Number of Shares, Exercisable at end of year Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number Weighted Average Exercise Price, Outstanding at beginning of year Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price Weighted Average Exercise Price, Options awarded Share-based Compensation Arrangements by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeitures, Weighted Average Grant Date Fair Value Weighted Average Exercise Price, Options expired and forfeited Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price Weighted Average Exercise Price, Options exercised Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price Weighted Average Exercise Price, Outstanding and expected to vest at end of year Weighted Average Exercise Price, Exercisable at end of year Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price Weighted Average Remaining Contractual Life, Outstanding and expected to vest at end of year Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Remaining Contractual Term Weighted Average Remaining Contractual Life, Exercisable at end of year Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term Aggregate Intrinsic Value, Outstanding and expected to vest at end of year Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value Aggregate Intrinsic Value, Exercisable at end of year Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value Income Tax Disclosure [Abstract] Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest Net Income Attributable to Noncontrolling Interest Net Income (Loss) Attributable to Noncontrolling Interest Income loss from continuing operations before tax Income loss from continuing operations before tax Income loss from continuing operations before tax U.S. federal statutory tax rate Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount Income Tax Reconciliation, State and Local Income Taxes Effective Income Tax Rate Reconciliation, State and Local Income Taxes, Amount Income Tax Reconciliation, Other Adjustments Effective Income Tax Rate Reconciliation, Other Adjustments, Amount Income Tax Expense (Benefit) Income Tax Expense (Benefit) Effective Income Tax Rate, Continuing Operations Effective Income Tax Rate Reconciliation, Percent Disclosure of Compensation Related Costs, Share-based Payments [Abstract] Restricted Stock Equity Awards [Member] Restricted Stock Equity Awards [Member] Restricted Stock-Equity Awards [Member] Restricted Stock Liability Awards [Member] Restricted Stock Liability Awards [Member] Restricted Stock Liability Awards [Member] Performance Units [Member] Performance Units [Member] Performance Units [Member] Performance Unit Awards [Member] Performance Shares [Member] Pioneer Southwest Ltip [Member] Pioneer Southwest Ltip [Member] Pioneer Southwest Ltip [Member] Sendero B Units [Member] Sendero B Units [Member] Sendero B Units [Member] Employee Stock [Member] Employee Stock [Member] Compensation Expense For Incentive Awards [Member] Compensation Expense For Incentive Awards [Member] Compensation Expense For Incentive Awards [Member] Deferred Compensation Arrangement with Individual, Compensation Expense Deferred Compensation Arrangement with Individual, Compensation Expense Income Tax Expense (Benefit) Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options Proceeds from Issuance of Shares under Incentive and Share-based Compensation Plans, Including Stock Options Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative [Table] Derivative [Table] Derivative Instrument Risk [Axis] Derivative Instrument [Axis] Derivative Contract Type [Domain] Derivative Contract [Domain] Oil contracts [Member] Oil contracts [Member] Oil contracts [Member] Oil contracts, price per bbl [Member] Oil contracts, price per bbl [Member] Oil contracts, price per bbl [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] Gas contracts, in MMBTU [Member] Gas contracts, in MMBTU [Member] Gas contracts, in MMBTU [Member] Gas contracts, price per MMBTU [Member] Gas contracts, price per MMBTU [Member] Gas contracts, price per MMBTU [Member] Basis Index Swaps [Member] Basis Index Swaps [Member] Basis Index Swaps Member. Basis Index Swap contracts, price per MMBTU [Member] Basis Index Swap contracts, price per MMBTU [Member] Basis Index Swap contracts, price per MMBTU [Member] July 15, 2022 Interest Rate Swaps [Member] July 15, 2022 Interest Rate Swaps [Member] July 15, 2022 Interest Rate Swaps [Member] Trading Activity, by Type [Axis] Trading Activity [Axis] Trading Activity, by Type [Domain] Trading Activity, by Type [Domain] Rollfactor Swap Contracts for March Through December 2014 [Member] Rollfactor Swap Contracts for March Through December 2014 [Member] Rollfactor Swap Contracts for March Through December 2014 [Member] Rollfactor Swap Contracts for Year 2 [Member] Rollfactor Swap Contracts for Year 2 [Member] Rollfactor Swap Contracts for Year 2 [Member] Rollfactor Swap Contracts [Member] Rollfactor Swap Contracts [Member] Rollfactor Swap Contracts [Member] Collar Contracts With Short Puts for Next Twelve Months [Member] Collar Contracts With Short Puts for Next Twelve Months [Member] Collar Contracts With Short Puts for Next Twelve Months [Member] Collar Contracts for Next Twelve Months [Member] Collar Contracts for Next Twelve Months [Member] Collar Contracts for Next Twelve Months [Member] Swap Contracts for March Through December 2014 [Member] Swap Contracts for March Through December 2014 [Member] Swap Contracts for March Through December 2014 [Member] Swap Contracts for April Through October 2014 [Member] Swap Contracts for April Through October 2014 [Member] Swap Contracts for April Through October 2014 [Member] Basis Swap Contracts for March 2014 [Member] Basis Swap Contracts for March 2014 [Member] Basis Swap Contracts for March 2014 [Member] Basis Swap Contracts for April Through October 2014 [Member] Basis Swap Contracts for April Through October 2014 [Member] Basis Swap Contracts for April Through October 2014 [Member] Basis Swap Contracts for April Through December 2014 [Member] Basis Swap Contracts for April Through December 2014 [Member] Basis Swap Contracts for April Through December 2014 [Member] Derivative, by Nature [Axis] Derivative, by Nature [Axis] Derivative, Name [Domain] Derivative, Name [Domain] Short Put [Member] Short Put [Member] Short Put [Member] Schedule of Trading Securities and Other Trading Assets [Line Items] Schedule of Trading Securities and Other Trading Assets [Line Items] Derivative, Nonmonetary Notional Amount Derivative, Nonmonetary Notional Amount Derivative, Swap Type, Average Fixed Price Derivative, Swap Type, Average Fixed Price 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. Swap Multiple Second Nearby Month Swap Multiple Second Nearby Month Swap Multiple Second Nearby Month Swap Multiple Third Nearby Month Swap Multiple Third Nearby Month Swap Multiple Third Nearby Month Average Daily Index Swaps Price Differential Average Daily Index Swaps Price Differential Average Daily Index Swaps Price Differential. Derivative fixed interest rate Derivative, Fixed Interest Rate Derivative fixed interest rate term, years Derivative Fixed Interest Rate Term Derivative Fixed Interest Rate Term Notional amount of debt Swap Contract Notional Amount Fixed Rate of Interest and Variable LIBOR Swap Contract Notional Amount Fixed Rate of Interest and Variable LIBOR Proceeds from Termination of Interest Rate Derivatives Proceeds from Termination of Interest Rate Derivatives Proceeds from Termination of Interest Rate Derivatives Derivative, Variable Interest Rate Derivative, Variable Interest Rate Schedule of Financial Assets and Liabilities Not Carried At Fair Value [Abstract] Schedule of Financial Assets and Liabilities Not Carried At Fair Value [Abstract] Fair Value Assets and Liabilities Not Carried At Fair Value [Table] Fair Value Assets and Liabilities Not Carried At Fair Value [Table] Fair Value Assets and Liabilities Not Carried At Fair Value [Table] Fair Value, by Balance Sheet Grouping, Disclosure Item Amounts [Axis] Measurement Basis [Axis] Fair Value, Disclosure Item Amounts [Domain] Fair Value Measurement [Domain] Reported Value Measurement [Member] Reported Value Measurement [Member] Estimate of Fair Value Measurement [Member] Estimate of Fair Value Measurement [Member] Fair Value Assets and Liabilities Not Carried At Fair Value [Line Items] Fair Value Assets and Liabilities Not Carried At Fair Value [Line Items] [Line Items] for Fair Value Assets and Liabilities Not Carried At Fair Value [Table] Long-term Debt Long-term Debt Components of Discontinued Operations [Abstract] Components of Discontinued Operations [Abstract] 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] Pioneer Alaska [Member] Pioneer Alaska [Member] Pioneer Alaska [Member] Barnett Shale Field [Member] Barnett Shale Field [Member] Barnett Shale Field [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] Oil and gas Oil and Gas Revenue Interest and other Other Nonoperating Income Gain on disposition of assets, net Gain (Loss) on Disposition of Property Plant Equipment Total revenues and other income from discontinued operations Total Revenues And Other Income From Discontinued Operations Total revenues and income from equity affiliates and other income from discontinued operations. Oil and gas production Oil and Gas Production Expense Production and Ad Valorem Taxes From Discontinued Operations Taxes, Miscellaneous Depletion, depreciation and amortization Depreciation, Depletion and Amortization Impairment of oil and gas properties Impairment of Oil and Gas Properties Exploration Abandonment and Impairment Expense Exploration Abandonment and Impairment Expense General and administrative General and Administrative Expense Accretion of discount on asset retirement obligations Asset Retirement Obligation, Accretion Expense Interest Interest Expense Other Other Nonoperating Expense Costs and expenses, Total Costs and Expenses Income from discontinued operations before income taxes Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax Current Current Income Tax Expense (Benefit) Deferred Deferred Income Tax Expense (Benefit) Income (loss) from discontinued operations Alaskan Petroleum Production Tax Credit Alaskan Petroleum Production Tax Credit Alaskan Petroleum Production Tax Credit Concentration Risks, Types, No Concentration Percentage [Abstract] Major Customers Concentration Risk Disclosure [Text Block] Major Customers And Derivative Counterparties [Abstract] Major Customers And Derivative Counterparties [Abstract] Statement [Table] Statement [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Plains Marketing LP [Member] Plains Marketing Lp [Member] Plains Marketing LP [Member] Enterprise Products Partners L.P. [Member] Enterprise Products Partners L P [Member] Enterprise Products Partners L.P. [Member] Occidental Energy Marketing Inc [Member] Occidental Energy Marketing Inc [Member] Occidental Energy Marketing Inc Statement [Line Items] Statement [Line Items] Consolidated oil, NGL and gas revenues represented by the company's purchases Concentration Risk, Percentage Number of Shares/Units, Outstanding at beginning of year Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number Number of Shares granted Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period Forfeitures, number of shares Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Forfeited in Period Awards vested Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period Number of Shares/Units, Outstanding at end of year Weighted Average Grant-Date Fair Value, Outstanding at beginning of year Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value Weighted Average Grant-Date Fair Value, Shares granted 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 Grant-Date Fair Value, Shares vested 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 Grant-Date Fair Value, Outstanding at end of year Accounting Policies [Abstract] Oil Entitlement Assets and Liabilities [Table] Oil Entitlement Assets and Liabilities [Table] Oil Entitlement Assets and Liabilities [Table] Oil and Gas Production Type [Axis] Oil and Gas Production Type [Axis] Oil Entitlement Assets and Liabilities [Domain] Oil Entitlement Assets and Liabilities [Domain] Oil Entitlement Assets and Liabilities [Domain] Oil Entitlement Assets and Liabilities [Line Items] Oil Entitlement Assets and Liabilities [Line Items] [Line Items] for Oil Entitlement Assets and Liabilities [Table] Gas Entitlement Assets Amount Gas Entitlement Assets Amount Gas Entitlement Assets Amount Gas Entitlement Assets Volumes In Mmcf Gas Entitlement Assets Volumes In Mmcf Gas Entitlement Assets Volumes in MMcf Gas Entitlement Liabilities Amount Gas Entitlement Liabilities Amount Gas Entitlement Liabilities Amount Gas Entitlement Liabilities Volumes In Mmcf Gas Entitlement Liabilities Volumes In Mmcf Gas Entitlement Liabilities Volumes in MMcf Operating Loss Carryforwards [Table] Operating Loss Carryforwards [Table] Income Tax Authority [Axis] Income Tax Authority [Axis] Income Tax Authority [Domain] Income Tax Authority [Domain] Foreign Country [Member] Foreign Tax Authority [Member] Tunisia and South Africa [Member] Tunisia and South Africa [Member] Tunisia and South Africa [Member] Internal Revenue Service (IRS) [Member] Internal Revenue Service (IRS) [Member] UNITED STATES UNITED STATES COLORADO COLORADO KANSAS KANSAS Operating Loss Carryforwards [Line Items] Operating Loss Carryforwards [Line Items] Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration Deferred Tax Assets, Operating Loss Carryforwards, Subject to Expiration Deferred Tax Assets, Operating Loss Carryforwards Deferred Tax Assets, Operating Loss Carryforwards Deferred Tax Assets, Valuation Allowance Deferred Tax Assets, Valuation Allowance Payments for income taxes, net of tax refunds received Income Taxes Paid, Net Unrecognized Tax Benefits Unrecognized Tax Benefits Interest and Other Income [Abstract] Interest And Other Income Other Income and Other Expense Disclosure [Text Block] Summary Of Open Tax Years, By Jurisdiction Summary of Income Tax Contingencies [Table Text Block] Schedule Of Income Tax (Provision) Benefit Allocation Schedule of Income Tax Expense (Benefit) Intraperiod Allocation [Table Text Block] A schedule of the company's income tax expense (benefit), and its allocation among continuing operations, discontinued operations, extraordinary items, other comprehensive income, and items charged or credited directly to shareholders' equity. Income Tax (Provision) Benefit Attributable To Income From Continuing Operations Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] Schedule Of Effective Income Tax Rate Reconciliation Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] Schedule Of Deferred Tax Assets And Deferred Tax Liabilities Schedule of Deferred Tax Assets and Liabilities [Table Text Block] Net Income Per Share Attributable to Common Stockholders [Abstract] Net Income Per Share Attributable to Common Stockholders [Abstract] Earnings Per Share, Policy [Policy Text Block] Earnings Per Share, Policy [Policy Text Block] Capitalized Exploratory Well Costs [Abstract] 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] Project [Domain] Capitalized exploratory costs [Member] Capitalized exploratory costs [Member] Capitalized exploratory costs [Member] Increase (Decrease) in Capitalized Exploratory Well Costs that are Pending Determination of Proved Reserves [Roll Forward] Increase (Decrease) in Capitalized Exploratory Well Costs that are Pending Determination of Proved Reserves [Roll Forward] Capitalized Exploratory Well Costs, Beginning Balance Capitalized Exploratory Well Costs Capitalized Exploratory Well Cost, Additions Pending 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 Capitalized Exploratory Well Costs, Ending Balance Disposal Group, Including Discontinued Operation, Property, Plant, and Equipment, Net Disposal Group, Including Discontinued Operation, Property, Plant, and Equipment, Net Expected option life - years Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term Volatility Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate Risk-free interest rate Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate Dividend yield Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate Capitalized Exploratory Well And Project Activity Capitalized Exploratory Well And Project Activity Capitalized Exploratory Well And Project Activity 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] Statement of Comprehensive Income [Abstract] Scenario [Axis] Scenario [Axis] Scenario, Unspecified [Domain] Scenario, Unspecified [Domain] Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Other comprehensive activity: Other Comprehensive Income (Loss), Net of Tax [Abstract] Net hedge (gains) losses included in continuing operations Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax Income tax (benefit) provision Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax Other comprehensive activity Other Comprehensive Income (Loss), Net of Tax Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income attributable to the noncontrolling interests Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest Comprehensive income (loss) attributable to common stockholders Comprehensive Income (Loss), Net of Tax, Attributable to Parent Commitments and Contingencies Disclosure [Abstract] Commitments And Contingencies Commitments and Contingencies Disclosure [Text Block] Related Party Transactions [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Statement, Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Additional Paid-In Capital [Member] Additional Paid-in Capital [Member] Pioneer Southwest [Member] Pioneer Southwest [Member] Relating to Pioneer Southwest. Net Income (loss) attributable to common stockholders Sale of Pioneer Southwest common units, net of tax Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Sale of Interest by Parent Issuance of Pioneer Southwest common units, net of tax Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Issuance of Equity by Subsidiary to Noncontrolling Interests Pioneer Southwest noncontrolling interest transferred to APIC Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests Deferred tax provision attributable to 2008 Pioneer Southwest initial public offering Subsidiary or Equity Method Investee, Deferred Income Tax Provision on Gain (Loss) Recognized, Amount Deferred tax benefit associated with the Pioneer Southwest merger Adjustments to Additional Paid in Capital, Income Tax Benefit from Merger Adjustments to Additional Paid in Capital, Income Tax Benefit from Merger Pioneer Southwest merger transaction costs Adjustments to Additional Paid in Capital, Other Net transfers from noncontrolling interest Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Net Net income (loss) attributable to common stockholders and transfers from noncontrolling interest Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Change Due to Net Income Attributable to Parent and Effects of Changes, Net Issued Common Units Limited Partners' Capital Account, Units Issued Units Issued, Tax Limited Partners' Capital Account, Units Issued, Tax Limited Partners' Capital Account, Units Issued, Tax Sale of Common Units Partners' Capital Account, Units, Sale of Units Sale of Units, Tax Partners' Capital Account, Units, Sale of Units, Tax Partners' Capital Account, Units, Sale of Units, Tax Fair Value Disclosures - Nonrecurring [Abstract] Fair Value Disclosures - Nonrecurring [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] Impaired Long-Lived Assets Held and Used by Type [Axis] Impaired Long-Lived Assets Held and Used by Type [Axis] Impaired Long-Lived Assets Held and Used, Asset Name [Domain] Impaired Long-Lived Assets Held and Used, Asset Name [Domain] South Texas Edwards And Austin Chalk [Member] South Texas Edwards And Austin Chalk [Member] SouthTexasEdwardsAndAustinChalkMember Raton Field [Member] Raton Field [Member] Raton Field [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 Management oil price outlook Management oil price outlook Management oil price outlook Management gas price outlook Management gas price outlook Management gas price outlook Fair Value of Assets Classified as Held for Sale [Abstract] Fair Value of Assets Classified as Held for Sale [Abstract] Sendero [Member] Sendero [Member] Sendero [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Fair Value, Measurement Frequency [Domain] Fair Value, Measurement Frequency [Domain] Fair Value, Hierarchy [Axis] Fair Value, Hierarchy [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy [Domain] Tangible Asset Impairment Charges Tangible Asset Impairment Charges Compensation and Employee Benefit Plans [Text Block] Compensation and Employee Benefit Plans [Text Block] Incentive Plans Share-based Compensation, Option and Incentive Plans Policy [Policy Text Block] Fair Value Disclosures [Abstract] discount rate used in impairment calculation discount rate used in impairment calculation discount rate used in impairment calculation Impairment of Long-Lived Assets Held-for-use Impairment of Long-Lived Assets Held-for-use Inventory Write-down Inventory Write-down Schedule Of Related Party Transactions Schedule of Related Party Transactions [Table Text Block] Class of Stock [Domain] Class of Stock [Domain] Number of Units granted Weighted Average Grant-Date Fair Value, Units granted Weighted Average Grant Date Fair Value, Units vested Performance percentage of actual payout minimum Performance Percentage Of Actual Payout Minimum Performance Percentage Of Actual Payout Minimum Performance percentage to reach maximum Performance percentage to reach maximum Performance percentage to reach Maximum Number of shares earned for each vested award Number Of Shares Earned For Each Vested Award Number Of Shares Earned For Each Vested Award Common stock, shares issued Common Stock, Shares, Issued Other Expense [Abstract] Other Expense [Abstract] Schedule Of Components Of Other Expense Schedule of Components of Other Expense Text Block Schedule of Components of Other Expense Text Block Schedule of Inventory [Table] Schedule of Inventory [Table] Schedule of Inventory [Table] Inventory [Axis] Inventory [Axis] Inventory [Domain] Inventory [Domain] Inventory [Domain] Schedule of Inventory [Line Items] Schedule of Inventory [Line Items] [Line Items] for Schedule of Inventory [Table] Materials and supplies inventories Inventory, Raw Materials and Supplies, Net of Reserves Commodities Energy Related Inventory, Crude Oil and Natural Gas Liquids Inventory, Drilling, Noncurrent Inventory, Drilling, Noncurrent Inventories Inventory, Net Net materials and supplies inventories reserves Inventory Valuation Reserves Swap Contracts for Next Twelve Months [Member] Swap Contracts for Next Twelve Months [Member] Swap Contracts for Next Twelve Months [Member] Swap Contracts for Year 2 [Member] Swap Contracts for Year 2 [Member] Swap Contracts for Year 2 [Member] Swap Contracts for Year 3 [Member] Swap Contracts for Year 3 [Member] Swap Contracts for Year 3 [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] 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] Basis Swap Contracts for Next Twelve Months [Member] Basis Swap Contracts for Next Twelve Months [Member] Basis Swap Contracts for Next Twelve Months Basis Swap Contracts for Year 2 [Member] Basis Swap Contracts for Year 2 [Member] Basis Swap Contracts for Year 2 Basis Swap Contracts for Year 3 [Member] Basis Swap Contracts for Year 3 [Member] Basis Swap Contracts for Year 3 [Member] Derivative [Line Items] Derivative [Line Items] Average Daily Gas Production Derivatives Volume per Day Average Daily Gas Production Derivatives Volume per Day Average Daily Gas Production Derivatives Volume per Day Income Taxes Income Tax Disclosure [Text Block] Derivative Financial Instruments Derivative Instruments and Hedging Activities Disclosure [Text Block] Related Party Transaction [Axis] Related Party Transaction [Axis] Related Party [Domain] Related Party [Domain] Right Of Way [Member] Right Of Way [Member] Right Of Way [Member] Gathering And Treating Fees [Member] Gathering And Treating Fees [Member] Gathering And Treating Fees [Member] EFS Midstream [Member] Efs Midstream [Member] EFS Midstream [Member] Proceeds from Equity Method Investment, Dividends or Distributions Proceeds from Equity Method Investment, Dividends or Distributions Cost reimbursement fixed Cost Reimbursement Fixed Cost reimbursement fixed Cost reimbursement variable Cost Reimbursement Variable Cost reimbursement variable Payments to Acquire Property, Plant, and Equipment Payments to Acquire Property, Plant, and Equipment Related party transaction expenses paid Related Party Transaction, Expenses from Transactions with Related Party Valuation Allowance [Table] Valuation Allowance [Table] Valuation Allowance by Deferred Tax Asset [Axis] Valuation Allowance by Deferred Tax Asset [Axis] Deferred Tax Asset [Domain] Deferred Tax Asset [Domain] Valuation Allowance [Line Items] Valuation Allowance [Line Items] Net operating loss carryforward Asset retirement obligations Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Asset Retirement Obligations Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Share-based Compensation Cost Other Deferred Tax Assets, Other Total deferred tax assets Deferred Tax Assets, Gross Net deferred tax assets Deferred Tax Assets, Net of Valuation Allowance Oil and gas properties, principally due to differences in basis, depletion and the deduction of intangible drilling costs for tax purposes Deferred Tax Liabilities, Property, Plant and Equipment Other property and equipment, principally due to the deduction of bonus depreciation for tax purposes Deferred Tax Liabilities, Other Finite-Lived Assets State taxes and other Deferred Tax Liabilities, Other Net deferred hedge gains Deferred Tax Liabilities Hedge Gains Net Deferred Tax Liabilities Hedge Gains Net Total deferred tax liabilities Deferred Tax Liabilities, Net Net deferred tax liability Deferred Tax Assets, Net Deferred income taxes Deferred Tax Assets, Net of Valuation Allowance, Current Current deferred income tax asset Current deferred income tax liability Deferred Tax Liabilities, Net, Current Non-current deferred income tax liability Deferred Tax Liabilities, Net, Noncurrent Valuation allowances Commitments And Contingencies [Table] Commitments And Contingencies [Table] Commitments And Contingencies [Table] Nature of Expense [Axis] Nature of Expense [Axis] Nature of Expense [Domain] Nature of Expense [Domain] nature of expense [Domain] Lease Payments Discontinued Operations [Member] Lease Payments Discontinued Operations [Member] Lease Payments Discontinued operations [Member] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Commitments And Contingencies [Line Items] Current annual salaries of officers and key employees Officer And Key Employee Compensation Expenditures for salaries of officers and key employees. Lease payments associated with operating leases Operating Leases, Rent Expense Other income Other Income Equity interest in income (loss) of EFS Midstream Income (Loss) from Equity Method Investments Deferred compensation plan income Deferred Compensation Plan Income Deferred Compensation Plan Income Interest income Other Interest and Dividend Income Third-party income from vertical integration services Third-party income from vertical integration services Third-party income from vertical integration services (b) Total interest and other income GrossRevenuesIncludedInThirdPartyIncomeFromVerticalIntegrationServices GrossRevenuesIncludedInThirdPartyIncomeFromVerticalIntegrationServices GrossRevenuesIncludedInThirdPartyIncomeFromVerticalIntegrationServices GrossExpensesIncludedInThirdPartyIncomeFromVerticalIntegrationServices GrossExpensesIncludedInThirdPartyIncomeFromVerticalIntegrationServices GrossExpensesIncludedInThirdPartyIncomeFromVerticalIntegrationServices Principles Of Consolidation Consolidation, Policy [Policy Text Block] Use Of Estimates In The Preparation Of Financial Statements Use of Estimates, Policy [Policy Text Block] Cash Equivalents Cash and Cash Equivalents, Policy [Policy Text Block] Accounts Receivable Trade and Other Accounts Receivable, Policy [Policy Text Block] Inventories Inventory, Policy [Policy Text Block] Oil And Gas Properties Oil And Gas Properties [Policy Text Block] Oil and gas properties policy text block Goodwill Goodwill and Intangible Assets Disclosure [Text Block] Other Property And Equipment, Net Other Property Plant And Equipment Net [Policy Text Block] Other property plant and equipment net policy text block Investment In Unconsolidated Affiliate Investment In Unconsolidated Affiliate [Policy Text Block] Investment In Unconsolidated Affiliate [Policy Text Block] Asset Retirement Obligations Asset Retirement Obligations, Policy [Policy Text Block] Treasury Stock Treasury Stock [Policy Text Block] Treasury stock policy text block Noncontrolling Interest In Consolidated Subsidiaries Noncontrolling Interest Disclosure [Text Block] Revenue Recognition Revenue Recognition, Policy [Policy Text Block] Derivatives And Hedging Derivatives, Policy [Policy Text Block] Environmental Environmental Costs, Policy [Policy Text Block] Stock-Based Compensation Segment Reporting Segment Reporting, Policy [Policy Text Block] Assets Held for Sale and Discontinued Operations Discontinued Operations, Policy [Policy Text Block] New Accounting Pronouncements New Accounting Pronouncements, Policy [Policy Text Block] Statement of Stockholders' Equity [Abstract] Common Stock [Member] Common Stock [Member] Treasury Stock [Member] Treasury Stock [Member] Retained Earnings [Member] Retained Earnings [Member] Accumulated Other Comprehensive Income (Loss) [Member] Accumulated Other Comprehensive Income (Loss) [Member] Noncontrolling Interests [Member] Noncontrolling Interest [Member] Beginning Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Beginning Balance, shares Shares, Outstanding Stock Issued During Period, Shares, New Issues Stock Issued During Period, Shares, New Issues Issuance of Common Stock Stock Issued During Period, Value, New Issues Dividends declared ($0.08 per share) Dividends, Cash Exercise of long-term incentive plan stock options and employee stock purchases, shares Exercise of long-term incentive plan stock options and employee stock purchases Stock Issued During Period, Value, Stock Options Exercised Purchase of treasury stock, shares Treasury Stock, Shares, Acquired Purchase of treasury stock Treasury Stock, Value, Acquired, Cost Method Conversion of 2.875% senior convertible notes, shares Stock Issued During Period, Shares, Conversion of Convertible Securities Conversion of 2.875% senior convertible notes Stock Issued During Period, Value, Conversion of Convertible Securities Tax benefit related to conversion of 2.875% senior convertible notes Adjustments to Additional Paid in Capital, Income Tax Benefit from Conversion of Convertible Notes Adjustments to Additional Paid in Capital, Income Tax Benefit from Conversion of Convertible Notes Tax benefits related to stock-based compensation Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation Issuance of treasury stock to acquire outstanding PSE units, shares Stock Issued During Period, Shares, Treasury Stock Reissued Issuance of treasury stock to acquire outstanding PSE units Stock Issued During Period, Value, Treasury Stock Reissued Pioneer Southwest noncontrolling interest transferred to APIC Disposition of subsidiary Disposition Of Subsidiary Equity Statement Disposition Of Subsidiary Compensation costs: Share-based Compensation [Abstract] Vested compensation awards, net, shares Stock Issued Or Vested During Period Shares Stock Awards Number of common stock issued as a result of granting or vesting of employee stock awards (including income tax benefits), and the shares of treasury stock purchases related to withholding taxes. Vested compensation awards, net Stock Issued Or Vested During Period Value Stock Awards Par value of share-based payments that vest or lapse during the period. Compensation costs included in net income Allocated Share-based Compensation Expense Cash contributions from noncontrolling interests Proceeds from Noncontrolling Interests Cash distributions to noncontrolling interests Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Other comprehensive income (loss): Deferred hedging activity, net of tax: Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax [Abstract] Hedge fair value changes, net Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Net of Tax Net hedge (gains) losses included in continuing operations Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax Ending Balance Ending Balance, shares 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] Asset Class [Axis] Asset Class [Axis] Assets Held-for-sale [Member] Assets Held-for-sale [Member] Inventory [Member] Inventory [Member] Inventory [Member] Transportation commitment charge Transportation Commitment Loss Transportation Commitment Loss Other Other General Expense Above market drilling and rig termination costs Idle And Terminated Rig Expense Expenses from idle and terminate rigs. Contingency and environmental accrual adjustments Change In Accrual For Legal And Environmental Contingencies Change in Accrual for Legal and Environmental Contingencies. Terminated Drilling Rig Expense Terminated Drilling Rig Expense Terminated Drilling Rig Expense Business Combination, Acquisition Related Costs Business Combination, Acquisition Related Costs Total other expense Schedule of Share-based Compensation Arrangement by Share-based Payment Award, Award Type and Plan Name [Axis] Award Type [Axis] Award Type [Domain] Equity Award [Domain] Schedule Of Compensation Expense For Each Type Of Incentive Award Schedule Of Compensation Expense For Each Type Of Incentive Award [Table Text Block] Schedule of compensation expense for each type of incentive award table text block Number Of Shares Available Under The Company's Long Term Incentive Plan Number Of Shares Available Under The Company's Long Term Incentive Plan [Table Text Block] Number of shares available under the company's long term incentive plan table text block Schedule Of Restricted Stock Award Activity Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] Schedule Of Weighted-Average Assumptions To Estimate The Fair Value Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] Schedule Of Stock Options Awards Activity Schedule of Share-based Compensation, Stock Options, Activity [Table Text Block] Schedule of Assumptions Used [Table Text Block] Schedule of Assumptions Used [Table Text Block] Schedule Of Performance Unit Activity Schedule of Nonvested Performance-based Units Activity [Table Text Block] Number Of Awards Available Under PSE Long Term Incentive Plan Schedule Of Number Of Awards Available Under Company's Long Term Incentive Plan [Table Text Block] Schedule of number of awards available under company's long term incentive plan table text block Schedule Of PSE Restricted Stock Award Activity Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value [Table Text Block] Schedule Of Employee Stock Purchase Plan Schedule of Share-based Compensation, Employee Stock Purchase Plan, Activity [Table Text Block] Statement of Cash Flows [Abstract] Cash flows from operating activities: Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] 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) loss on disposition of assets, net Gain (Loss) on Disposition of Assets for Financial Service Operations 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 Paid-in-Kind Interest Derivative related activity Unrealized Gain Loss On Derivative Instruments Aggregate net unrealized 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. Amortization of deferred revenue Deferred Revenue Amortization Deferred revenue recognized but not to be included in current operations cash flows. Other noncash items Other Noncash Income (Expense) Change in operating assets and liabilities 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 Payments for acquisitions, net of cash acquired Payments to Acquire Businesses, Net of Cash Acquired Distribution from (investment in) unconsolidated subsidiary Payments to Acquire Interest in Subsidiaries and Affiliates 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 Proceeds from Issuance of Common Stock Proceeds from issuance of partnership common units, net of issuance costs Proceeds from Issuance of Common Limited Partners Units Contributions from noncontrolling interests Proceeds from Contributions from Affiliates 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 Purchase of treasury stock Payments for Repurchase of Common Stock Excess tax benefits from share-based payment arrangements Excess Tax Benefit from Share-based Compensation, Financing Activities Payment of financing fees Payments of Financing Costs Dividends paid Payments of Dividends Net cash provided by 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, at Carrying Value Cash and cash equivalents, end of period Accounting Changes and Error Corrections [Abstract] Schedule of Revisions and Prior Period Adjustment Restatement [Table] Schedule of Error Corrections and Prior Period Adjustment Restatement [Table] Adjustments for Revisions [Axis] Adjustments for Error Corrections [Axis] Adjustments for Revisions [Domain] Adjustments for Error Correction [Domain] Increase in Sales of Purchased Oil and Gas, Revision of Sales of Purchased Oil and Gas [Member] Increase in Sales of Purchased Oil and Gas, Revision of Sales of Purchased Oil and Gas [Member] Increase in Sales of Purchased Oil and Gas, Revision of Sales of Purchased Oil and Gas [Member] Increase in Costs of Purchased Oil and Gas, Revisions of Purchased Oil and Gas [Member] Increase in Costs of Purchased Oil and Gas, Revisions of Purchased Oil and Gas [Member] Increase in Costs of Purchased Oil and Gas, Revisions of Purchased Oil and Gas [Member] Increase in Other Expense, Revision of Purchased Oil and Gas [Member] Increase in Other Expense, Revision of Purchased Oil and Gas [Member] Increase in Other Expense, Revision of Purchased Oil and Gas [Member] Restatement Adjustment [Member] Restatement Adjustment [Member] Scenario, Previously Reported [Member] Scenario, Previously Reported [Member] Revisions and Prior Period Adjustments Restatement [Line Items] Error Corrections and Prior Period Adjustments Restatement [Line Items] Sales of purchased oil and gas Revenue from Purchased Oil and Gas Quantifying Revision in Current Year Financial Statements, Revenue Amount Quantifying Revision in Current Year Financial Statements, Revenue Amount Quantifying Revision in Current Year Financial Statements, Revenue Amount Quantifying Revision in Current Year Financial Statements, Expense Amount Quantifying Revision in Current Year Financial Statements, Expense Amount Quantifying Revision in Current Year Financial Statements, Expense Amount Financial Information, Charges and Credits, Amount Reconciling to Previously Reported Results Financial Information, Charges and Credits, Amount Reconciling to Previously Reported Results Financial Information, Charges and Credits, Amount Reconciling to Previously Reported Results Purchased oil and gas Cost of Purchased Oil and Gas Approved and authorized shares Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized Shares issued Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period 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 Business Combinations [Abstract] Acquisition and Divestitures [Text Block] Mergers, Acquisitions and Dispositions Disclosures [Text Block] U.S. federal Current Federal Tax Expense (Benefit) U.S. state Current State and Local Tax Expense (Benefit) Foreign Current Foreign Tax Expense (Benefit) Current income tax (provision) benefit U.S. federal Deferred Federal Income Tax Expense (Benefit) U.S. state Deferred State and Local Income Tax Expense (Benefit) Deferred income tax (provision) benefit Income tax (provision) benefit Schedule of Other Ownership Interests [Table] Schedule of Other Ownership Interests [Table] Other Ownership Interests by 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] General Partner Interest [Member] General Partner Interest [Member] General Partner Interest [Member] Wolfcamp [Member] Wolfcamp [Member] Wolfcamp [Member] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Accounts receivable - trade Accounts Receivable, Net, Current Allowances for doubtful accounts Allowance for Doubtful Accounts, Premiums and Other Receivables Natural gas processing plants number Natural Gas Processing Plants Number Natural Gas Processing Plants Number Treating facilities number Treating Facilities Number Treating facilities number Operational natural gas processing plants Natural Gas Processing Plants Operated Number Natural gas processing plants operated number. Operational treating facilities Treating Facilities Operated Number Treating facilities operated number. Third party revenues, processing plants and treating facilities Gas Gathering, Transportation, Marketing and Processing Revenue Third party expenses, processing plants and treating facilities Gas Gathering, Transportation, Marketing and Processing Costs Goodwill, Written off Related to Sale of Business Unit Goodwill, Written off Related to Sale of Business Unit Joint Venture Investment Ownership Percentage Joint Venture Investment Ownership Percentage Investment in Joint Venture Percentage of interest sold Minority Interest Ownership, Percentage Sold Minority Interest Ownership, Percentage Sold Proceeds from sale of interest in EFS Midstream Proceeds from Divestiture of Interest in Subsidiaries and Affiliates Deferred gain on sale of EFS midstream Gain On Sale Not Qualifying As Gain As Of Balance Sheet Date Amount of gain on the sale of an equity interest that does not qualify for gain recognition as of the balance sheet date. EFS midstream deferred gain amortization period, years Deferred Gain Amortization Period Deferred gain amortization period Partnerships interest Noncontrolling Interest, Ownership Percentage by Parent Share Per Unit Exchange Ratio Share Per Unit Exchange Ratio Shares of stock to be exchanged for each unit Noncontrolling interest in consolidating subsidiaries Stockholders' Equity Attributable to Noncontrolling Interest Net income attributable to noncontrolling interests Deferred Revenue, Revenue Recognized Deferred Revenue, Revenue Recognized Basis points added to variable interest rate Derivative, Basis Points Derivative, Basis Points Schedule of Derivative Assets and Liabilities by Counterparty [Table] Schedule of Derivative Assets and Liabilities by Counterparty [Table] Schedule of Derivative Assets and Liabilities by Counterparty [Table] JP Morgan Chase [Member] Jp Morgan Chase [Member] JP Morgan Chase [Member] Morgan Stanley [Member] Morgan Stanley [Member] Morgan Stanley [Member] Merrill Lynch [Member] Merrill Lynch [Member] Merrill Lynch [Member] Barclays Capital [Member] Barclays Capital [Member] Barclays Capital [Member] Den Norske Bank [Member] Den Norske Bank [Member] Den Norske Bank [Member] Societe Generale [Member] Societe Generale [Member] Societe Generale [Member] Macquarie Bank [Member] Macquarie Bank [Member] Macquarie Bank [Member] J. Aron & Company [Member] J. Aron & Company [Member] J. Aron & Company [Member] Wells Fargo Bank, N.A. [Member] Wells Fargo Bank N [Member] Wells Fargo Bank, N.A. [Member] Citibank N [Member] Citibank N [Member] Citibank, N.A. [Member] Deutsche Bank [Member] Deutsche Bank [Member] Deutsche Bank [Member] BMO Financial Group [Member] BMO Financial Group [Member] BMO Financial Group [Member] Credit Suisse [Member] Credit Suisse [Member] Credit Suisse [Member] BP Corporation North America [Member] BP Corporation North America [Member] BP Corporation North America [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member] Royal Bank of Canada [Member] BNP Paribas [Member] BNP Paribas [Member] BNP Paribas [Member] Toronto Dominion [Member] Toronto Dominion [Member] Toronto Dominion [Member] Mitsubishi UFJ Financial Group [Member] Mitsubishi UFJ Financial Group [Member] Mitsubishi UFJ Financial Group [Member] Credit Agricole [Member] Credit Agricole [Member] Credit Agricole [Member] Schedule of Derivative Assets and Liabilities by Counterparty [Line Items] Schedule of Derivative Assets and Liabilities by Counterparty [Line Items] Schedule of Derivative Assets and Liabilities by Counterparty [Line Items] Derivative Assets (Liabilities), at Fair Value, Net Derivative Assets (Liabilities), at Fair Value, Net Range [Axis] Range [Axis] Range [Domain] Range [Domain] Maximum [Member] Maximum [Member] Minimum [Member] Minimum [Member] Range of volatilities Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Weighted Average Volatility Rate Interest Rate Derivatives [Member] Interest Rate Contract [Member] Commodity Price Derivatives [Member] Commodity Contract [Member] Derivative Instruments, Gain (Loss) by Income Statement Location [Axis] Income Statement Location [Axis] Income Statement and Other Comprehensive Income Location [Domain] Income Statement Location [Domain] Interest Expense [Member] Interest Expense [Member] Oil And Gas revenue [Member] Oil And Gas Revenue [Member] Oil and gas revenue Derivative Gains (Losses), Net [Member] Derivative Gains Losses [Member] Derivative gains (losses) [Member] Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, before Tax Amount of Gain (Loss) Recognized in Earnings on Derivatives Loss on Derivative Instruments, Pretax Aging of Capitalized Exploratory Well Costs [Axis] Aging of Capitalized Exploratory Well Costs [Axis] Nuna [Member] Nuna [Member] Nuna [Member] Oooguruk [Member] Oooguruk [Member] Oooguruk [Member] One year or less Capitalized Exploratory Well Costs that Have Been Capitalized for Period of One Year or Less More than one year Capitalized Exploratory Well Costs that Have Been Capitalized for Period Greater than One Year Capitalized exploratory well costs, total suspended Number of projects with exploratory well costs that have been suspended for a period greater than one year Projects that have Exploratory Well Costs that have been Capitalized for Period Greater than One Year, Number of Projects Capitalized Exploratory Well Cost, Charged to Expense Summary Of Significant Accounting Policies Significant Accounting Policies [Text Block] Property, Plant and Equipment [Abstract] Schedule of Property, Plant and Equipment [Table] Property, Plant and Equipment [Table] Property, Plant and Equipment by Type [Axis] Property, Plant and Equipment, Type [Axis] Property, Plant and Equipment, Type [Domain] Property, Plant and Equipment, Type [Domain] Proved and Unproved Sand Leaseholds [Member] Proved and Unproved Sand Leaseholds [Member] Proved and Unproved Sand Leaseholds [Member] Wells and Related Equipment and Facilities [Member] Wells and Related Equipment and Facilities [Member] Land and Building [Member] Land and Building [Member] Transportation Equipment [Member] Transportation Equipment [Member] Furniture and Fixtures [Member] Furniture and Fixtures [Member] Leasehold Improvements [Member] Leasehold Improvements [Member] Property, Plant and Equipment [Line Items] Property, Plant and Equipment [Line Items] Property, Plant and Equipment, Gross Property, Plant and Equipment, Gross Accumulated depreciation property, plant and equipment, other assets Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Drilling rigs owned Drilling rigs owned Drilling rigs owned. Fracture Stimulation Fleets Fracture Stimulation Fleets Fracture Stimulation Fleets Owned Assets Held-for-sale, Property, Plant and Equipment Assets Held-for-sale, Property, Plant and Equipment Document And Entity Information [Abstract] Document and Entity Information [Abstract] Document Information [Table] Document Information [Table] Document Information, Document [Axis] Document Information, Document [Axis] Document [Domain] Document [Domain] Document Information [Line Items] Document Information [Line Items] Entity Registrant Name Entity Registrant Name Trading Symbol Trading Symbol Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Filer Category Entity Filer Category Document Type Document Type Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Amendment Flag Amendment Flag Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding 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 Public Float Entity Public Float Disclosures About Fair Value Measurements Fair Value Disclosures [Text Block] Pioneer Southwest Employee Long Term Incentive Plan [Member] Pioneer Southwest Employee Long Term Incentive Plan [Member] Pioneer Southwest Employee Long Term Incentive Plan [Member] Awards available for future grant Assets And Liabilities That Are 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] Fair Value Measurements Not Carried At Fair Value Fair Value, by Balance Sheet Grouping [Table Text Block] Income Statement [Abstract] Revenues and other income: Revenues [Abstract] Interest and other Derivative gains, net Gain (Loss) on Derivative Instruments, Net, Pretax Gain (Loss) on disposition of assets, net Revenues and other income Total revenues and other income Total revenues and income from equity affiliates and other income. Costs and expenses: Costs and Expenses [Abstract] Production and ad valorem taxes Exploration and abandonments Other Income (loss) from continuing operations before income taxes Income tax benefit (provision) Income (loss) from continuing operations Income (Loss) from Continuing Operations, Including Portion Attributable to Noncontrolling Interest Income (loss) from discontinued operations, net of tax Net income (loss) Net income (loss) attributable to common stockholders Basic earnings per share: Earnings Per Share, Basic [Abstract] Income (loss) from continuing operations attributable to common stockholders Income (Loss) from Continuing Operations, Per Basic Share Income (loss) from discontinued operations attributable to common stockholders Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share Net income (loss) attributable to common stockholders Earnings Per Share, Basic Diluted earnings per share: Earnings Per Share, Diluted [Abstract] Income (loss) from continuing operations attributable to common stockholders Income (Loss) from Continuing Operations, Per Diluted Share Income (loss) from discontinued operations attributable to common stockholders Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Diluted Share Net income (loss) attributable to common stockholders Earnings Per Share, Diluted Weighted average shares outstanding: Weighted Average Number of Shares Outstanding, Diluted [Abstract] Basic Weighted Average Number of Shares Outstanding, Basic Diluted Weighted Average Number of Shares Outstanding, Diluted Amounts attributable to common stockholders: Income Amounts Attributable to Parent, Disclosures [Abstract] Income (loss) from discontinued operations, net of tax Income (Loss) from Discontinued Operations, Net of Tax, Attributable to Parent Net income (loss) Statement of Financial Position [Abstract] Class of Stock [Axis] Class of Stock [Axis] Deferred Tax Assets, Net of Valuation Allowance, Noncurrent Deferred Tax Assets, Net of Valuation Allowance, Noncurrent ASSETS Assets [Abstract] Current assets: Assets, Current [Abstract] Cash and cash equivalents Accounts receivable: Accounts Receivable, Net, Current [Abstract] Trade, net Due from affiliates Due from Affiliate, Current Income taxes receivable Income Taxes Receivable, Current Prepaid expenses Prepaid Expense, Current Assets held for sale Assets of Disposal Group, Including Discontinued Operation Other current assets: Other Assets, Current [Abstract] Other Assets, Current [Abstract] Derivatives Derivative Asset, Current Other Other Assets, Current Total current assets Assets, Current Property, plant and equipment, at cost: Property, Plant and Equipment, Net [Abstract] Oil and gas properties, using the successful efforts method of accounting: Oil and Gas Property, Successful Effort Method, Net [Abstract] Proved properties Proved Oil and Gas Property, Successful Effort Method Unproved properties Unproved Oil and Gas Property, Successful Effort Method Accumulated depletion, depreciation and amortization Oil and Gas Property, Successful Effort Method, Accumulated Depreciation, Depletion and Amortization Total property, plant and equipment Oil and Gas Property, Successful Effort Method, Net Goodwill Goodwill Other property and equipment, net Property, Plant and Equipment, Other, Gross Other assets: Other Assets, Noncurrent [Abstract] Investment in unconsolidated affiliate Equity Method Investments Derivatives Derivative Asset, 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 Deferred income taxes Liabilities held for sale Liabilities of Disposal Group, Including Discontinued Operation Other current liabilities: Other Liabilities, Current [Abstract] Derivatives Derivative Liability, Current Deferred revenue Deferred Revenue, Current Other Other Liabilities, Current Total current liabilities Liabilities, Current Long-term debt Long-term Debt, Excluding Current Maturities Derivatives Derivative Liability, Noncurrent Deferred income taxes 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) Accumulated other comprehensive income (loss) - net deferred hedge gains (losses), net of tax Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax Total stockholders' equity attributable to common stockholders Stockholders' Equity Attributable to Parent Total stockholders' equity Commitments and contingencies Commitments and Contingencies Liabilities and Stockholders' Equity, Total Liabilities and Equity Debt Disclosure [Abstract] Fair Value by Liability Class [Axis] Liability Class [Axis] Fair Value, Liabilities, Measured on Recurring Basis, Unobservable Input Reconciliation, by Liability Class [Domain] Fair Value by Liability Class [Domain] Derivative Obligations [Member] Derivative Obligations [Member] Derivative Obligations Cash payments for interest Interest Paid Accretion/amortization of discounts or premiums on loans Amortization of Debt Discount (Premium) Accretion of discount on derivative obligations Accretion Expense Amortization of net deferred hedge losses (see Note I) Amortization Of Deferred Gain Loss On Discontinuation Of Fair Value Hedge Amortization Of Deferred Gain Loss In Discontinuation Of Fair Value Hedge. Accretion of discount on postretirement benefit obligations Accretion Of Discount On Postretirement Benefit Obligations Accretion Of Discount On Postretirement Benefit Obligations Amortization of capitalized loan fees Amortization of Financing Costs and Discounts Net changes in accruals Debt Instrument, Increase, Accrued Interest Interest incurred Interest Costs Incurred Less capitalized interest Interest Costs Capitalized Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Related Party [Axis] Related Party [Axis] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Receipt of lease operating and supervision charges in accordance with standard industry operating agreements Revenue from Related Parties Reimbursement of general and administrative expenses Reimbursement of General and Administrative Expenses Reimbursement of General and Administrative Expenses Subsequent Events [Abstract] Subsequent Event [Table] Subsequent Event [Table] Subsequent Event [Line Items] Subsequent Event [Line Items] Business Combination, Consideration Transferred Business Combination, Consideration Transferred Proceeds from Divestiture of Interest in Consolidated Subsidiaries Proceeds from Divestiture of Interest in Consolidated Subsidiaries PSE Ltip Phantom Units [Member] PSE Ltip Phantom Units [Member] PSE Ltip Phantom Units [Member] Number of Units Lapse of restrictions Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Lapsed Restrictions in Period Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Options Lapsed Restrictions in Period Weighted Average Grant Date Fair Value Lapse of restrictions Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Option Lapse Of Restrictions in Period Weighted Average Grant Date Fair Value Share Based Compensation Arrangement by Share Based Payment Award Equity Instruments Other Than Option Lapse Of Restrictions in Period Weighted Average Grant Date Fair Value Asset Retirement Obligation [Abstract] Asset Retirement Obligations Asset Retirement Obligation Disclosure [Text Block] 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 Excluded from Computation of Earnings Per Share, by Antidilutive Securities [Axis] Antidilutive Securities [Axis] Antidilutive Securities, Name [Domain] Antidilutive Securities, Name [Domain] Unvested Performance units [Member] Unvested Performance units [Member] Unvested Performance units [Member] Conversion rights [Member] Conversion rights [Member] Conversion rights [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] Dilutive common stock options Incremental Common Shares Attributable to Dilutive Effect of Call Options and Warrants Contingently issuable - performance shares Incremental Common Shares Attributable to Dilutive Effect of Contingently Issuable Shares Convertible notes dilution Incremental Common Shares Attributable to Dilutive Effect of Conversion of Debt Securities Diluted Antidilutive securities excluded from computation of earnings per share, amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 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] 5.875% Senior Notes Due 2016 [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] 6.65% Senior Notes Due 2017 [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] 6.875% Senior Notes Due 2018 [Member] Six Point Eight Seven Five Percent Senior Notes Due Two Thousand Eighteen [Member] Six Point Eight Seven Five Percent Senior Notes Due Two Thousand Eighteen [Member] 7.500% Senior Notes Due 2020 [Member] Seven Point Five Zero Zero Percentage Senior Notes Due Two Thousand And Twenty [Member] Seven Point Five Zero Zero Percentage Senior Notes Due Two Thousand and Twenty [Member] 3.95% Senior Notes Due 2022 [Member] 3.95% Senior Notes Due 2022 [Member] 3.95% Senior Notes Due 2022 [Member] 7.20% Senior Notes Due 2028 [Member] Seven Point Two Zero Percent Senior Notes Due Two Thousand Twenty Eight [Member] Seven Point Two Zero Percent Senior Notes Due Two Thousand Twenty Eight [Member] 2.875% Convertible Senior Notes Due 2038 [Member] Two Point Eight Seven Five Percent Senior Convertible Notes Due Two Thousand Thirty Eight [Member] Two Point Eight Seven Five Percent Senior Convertible Notes Due Two Thousand Thirty Eight [Member] Pioneer Credit Facility [Member] Pioneer Credit Facility [Member] Pioneer Credit Facility [Member] Pioneer Southwest Credit Facility [Member] Pioneer Southwest Credit Facility [Member] Pioneer Southwest Credit Facility [Member] Debt Instrument [Line Items] Debt Instrument [Line Items] Outstanding borrowing Line of Credit Facility, Amount Outstanding Issuance of senior notes Senior Notes Convertible debt Convertible Debt Outstanding debt principal balances, gross Long-term Debt, Gross Issuance discounts and premiums, net Debt Instrument, Unamortized Discount (Premium), Net Net deferred fair value hedge losses Deferred (Gain) Loss on Discontinuation of Fair Value Hedge Senior notes, interest rate Debt Instrument, Interest Rate, Stated Percentage Interest And Other Income Interest and Other Income [Table Text Block] Discontinued Operations Balance Sheet Held For Sale [Abstract] Discontinued Operations Balance Sheet Held For Sale [Abstract] Assets of Disposal Group, Including Discontinued Operation, Current Assets of Disposal Group, Including Discontinued Operation, Current Disposal Group, Including Discontinued Operation, Deferred Tax Assets Disposal Group, Including Discontinued Operation, Deferred Tax Assets Disposal Group, Including Discontinued Operation, Other Assets Disposal Group, Including Discontinued Operation, Other Assets Liabilities of Disposal Group, Including Discontinued Operation, Current Liabilities of Disposal Group, Including Discontinued Operation, Current Disposal Group, Including Discontinued Operation, Other Liabilities Disposal Group, Including Discontinued Operation, Other Liabilities Components Of Long-Term Debt