Accounting Policies [Abstract] Accounting Policies [Abstract] Accounts Payable, Current Accounts payable Accounts Payable Accounts payable Accounts Payable, Related Parties, Current Accounts payable at CEQP Accounts Receivable, Net, Current Accounts receivable Accounts receivable, less allowance for doubtful accounts Accounts Receivable, Related Parties, Current Related party receivables Accrual for Environmental Loss Contingencies Accrual for Environmental Loss Contingencies Accrual for Taxes Other than Income Taxes, Current Accrued property taxes Accrued Capital Leases Accrued Capital Leases Capital leases Accrued Capital Purchases Accrued Capital Purchases Accrued additions to property, plant and equipment Accrued Expenses And Current Liabilities [Line Items] Accrued Expenses And Current Liabilities [Line Items] Accrued Expenses and Other Liabilities [Line Items] Accrued Expenses and Other Liabilities [Table] Accrued Expenses And Other Liabilities [Table] Accrued Expenses and Other Liabilities [Table] Accrued Liabilities, Current Accrued expenses Total accrued expenses and other liabilities Accrued expenses and other liabilities Accrued Product Purchases Payable Accrued Product Purchases Payable Accrued natural gas purchases Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Less: accumulated depreciation and depletion Acquired Storage Contracts [Member] Acquired Storage Contracts [Member] Acquired storage contracts Amortization Amortization Adjustments Related to Tax Withholding for Share-based Compensation Taxes paid for unit-based compensation vesting Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to reconcile net income (loss) to net cash provided by operating activities: Affiliated Entity [Member] Affiliated Entity Allocated Share-based Compensation Expense Allocated Share-based Compensation Expense Allowance for Doubtful Accounts [Member] Allowance for Doubtful Accounts Allowance for Doubtful Accounts Receivable, Current Allowance for doubtful accounts Amendment Flag Amendment Flag Amortization of Debt Issuance Costs and Discounts Amortization of debt-related deferred costs, discounts and premiums Amortization of Intangible Assets Amortization of Intangible Assets Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries Amount of Restricted Net Assets for Consolidated and Unconsolidated Subsidiaries Antero Resources Appalachian Corporation [Member] Antero Resources Appalachian Corporation [Member] Antero Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Units excluded from dilutive earnings per share Area dedicated for gas production. Area Dedicated for Gas Production Area dedicated for gas production Arrow [Member] Arrow [Member] Arrow Asset Retirement Obligation Net asset retirement obligation at December 31 Net asset retirement obligation at January 1 Asset Retirement Obligation, Accretion Expense Accretion expense Asset Retirement Obligation Disclosure [Abstract] Asset Retirement Obligation Disclosure [Abstract] Asset Retirement Obligation Disclosure [Text Block] Asset Retirement Obligations Asset Retirement Obligation, Liabilities Incurred Liabilities incurred Asset Retirement Obligation, Period Increase (Decrease) Liabilities settled Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] Asset Retirement Obligations, Policy [Policy Text Block] Asset Retirement Obligations Assets Total assets Total assets Assets [Abstract] Assets Assets, Current Total current assets Assets, Current [Abstract] Current assets: Assets, Fair Value Disclosure Total assets at fair value Assets, Fair Value Disclosure, Excluding Netting Adjustments Assets Fair Value Disclosure Excluding Netting Adjustments Assets, Fair Value Disclosure, Excluding Netting Adjustments Award Type [Axis] Award Type [Axis] Balance Sheet Related Disclosures [Abstract] Balance Sheet Related Disclosures [Abstract] Barnett. Barnett [Member] Barnett Base gas. Base Gas [Member] Base gas Basis of Presentation and Significant Accounting Policies [Text Block] Significant Accounting Policies Bridge Loan [Member] Bridge Loan Brookfield Infrastructure Group [Member] Brookfield Infrastructure Group [Member] Brookfield Infrastructure Group Building and Building Improvements [Member] Buildings, land, rights-of-way, storage rights and easements Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition [Line Items] Business Acquisition [Line Items] Business Acquisition, Percentage of Voting Interests Acquired Percentage of voting interests acquired Business Combination, Consideration Transferred Consideration transferred Business Combination, Consideration Transferred, Liabilities Incurred Liabilities incurred Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability Loss on contingent consideration Loss on contingent consideration Business Combination, Contingent Consideration, Liability, Current Contingent consideration, current liability Business Combination Disclosure [Text Block] Acquisitions Business Combination, Equity Interest Issued or Issuable, Conversion Ratio Business Combination Equity Interest Issuedor Issuable Conversion Ratio Conversion ratio Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Crude Hauling Capacity, Per Day Business Combination Recognized Identifiable Assets Acquiredand Liabilities Assumed Crude Hauling Capacity Per Day Crude hauling capacity, per day Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Crude Trailers Business Combination Recognized Identifiable Assets Acquiredand Liabilities Assumed Crude Trailers Number of Crude Trailers Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Double Bottom Tanks Business Combination Recognized Identifiable Assets Acquiredand Liabilities Assumed Double Bottom Tanks Number of Double Bottom tanks Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Land, Area Business Combination Recognized Identifiable Assets Acquiredand Liabilities Assumed Land Area Land (in acres) Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Number Business Combination Recognized Identifiable Assets Acquiredand Liabilities Assumed Number Number of trailer tanks Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment Property, plant and equipment Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Service Vehicles Business Combination Recognized Identifiable Assets Acquiredand Liabilities Assumed Service Vehicles Number of Service Vehicles Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Tractors Business Combination Recognized Identifiable Assets Acquiredand Liabilities Assumed Tractors Number of Tractors Business Combinations [Abstract] Business Combinations [Abstract] Call Premium On Debt Redemption Call Premium On Debt Redemption Call Premium On Debt Redemption Capital Commitmentto Acquire Equity Method Investment Capital Commitmentto Acquire Equity Method Investment Capital Commitment to Acquire Equity Method Investment Capital Expenditures Incurred but Not yet Paid Net change to property, plant and equipment through accounts payable and accrued expenses Cash and Cash Equivalents, at Carrying Value Cash at end of period Cash at beginning of period Cash Cash and Cash Equivalents, Period Increase (Decrease) Net change in cash Net change in cash Cash and Cash Equivalents, Policy [Policy Text Block] Cash Cash Distribution [Member] Cash Distribution Cash Dividends Paid to Parent Company by Consolidated Subsidiaries Dividends received from CMLP Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Supplemental schedule of non-cash investing and financing activities CEGP [Member] C E G P [Member] CEGP [Member] Provides additional details of the components of certain balance sheet accounts. Certain Balance Sheet Information [Text Block] Certain Balance Sheet Information Class A Purchasers [Member] Class A Purchasers [Member] Class A Purchasers Class of Stock [Domain] Class of Stock [Domain] Collateral Already Posted, Aggregate Fair Value Collateral posted for commodity derivative instruments COLT. C O L T [Member] COLT Commitments [Abstract] Commitments [Abstract] Commitments [Abstract] Commitments and Contingencies Commitments and contingencies Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Abstract] Commitments and Contingencies Disclosure [Text Block] Commitments and Contingencies Commodity Contract [Member] Commodity contract Commodity Contract With Credit Contingent Features [Member] Commodity Contract With Credit Contingent Features [Member] Commodity contract with credit contingent features Commodity [Member] Commodity Common Stock, Capital Shares Reserved for Future Issuance Shares reserved for future issuance Common Unit Capital [Member] Common Unit Capital [Member] Common Unit Capital Common Unit, Outstanding Common Unit, Outstanding Common Unit, Outstanding Common Units Availablefor Issuance Common Units Availablefor Issuance Common Units Available for Issuance Common Units [Member] Common Units [Member] Common Units Compensation and Employee Benefit Plans [Text Block] Employee Benefit Plan Compensation Related Costs, Policy [Policy Text Block] Unit-Based Compensation Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income (loss) attributable to Crestwood Equity Partners LP Comprehensive income (loss) attributable to Crestwood Equity Partners LP Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income (loss) attributable to non-controlling interest Comprehensive income (loss) attributable to non-controlling partners Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive loss Comprehensive loss Concentration Risk, Credit Risk, Policy [Policy Text Block] Credit Risk and Concentrations Concentration Risk, Percentage Concentration Risk, Percentage Condensed Consolidating Financial Information Disclosure [Text Block] Condensed Consolidating Financial Information Disclosure [Text Block] Condensed Consolidating Financial Information Condensed Financial Information of Parent Company Only Disclosure [Abstract] Condensed Financial Information of Parent Company Only Disclosure [Abstract] Condensed Financial Information of Parent Company Only Disclosure [Text Block] Schedule - Schedule I - Crestwood Equity Partners LP - Parent Only Condensed Financial Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Consolidated EBITDA to consolidated interest expense (as defined in the Credit Agreement) Consolidated Ebitda To Consolidated Interest Expense Consolidated EBITDA to consolidated interest expense Consolidated Leverage Ratio Maximum. Consolidated Leverage Ratio Maximum Consolidated leverage ratio, maximum Consolidation, Eliminations [Member] Eliminations Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Consolidation, Policy [Policy Text Block] Principles of Consolidation Construction in Progress [Member] Construction in process Contributionsfrom Distributionsto Parent Contributionsfrom Distributionsto Parent Contributions from (distributions to) parent Contributions from parents Contributionsto Distributionsfrom Consolidated Affiliates Contributionsto Distributionsfrom Consolidated Affiliates Capital contributions to consolidated affiliates Capital distributions from consolidated affiliates Corporate Segment [Member] Corporate Cost of Goods and Services Sold Costs of product/services sold Cost of Goods Sold Total product costs Cost of Goods Sold, Oil and Gas [Abstract] Costs of product/services sold (exclusive of items shown separately below): Cost of Goods Sold, Other Product Sold [Member] Cost Of Goods Sold Other Product Sold [Member] Products and services sold Cost of Revenue Total costs of products/services sold Total costs of product/services sold Cost of Services Total service costs Costs and Expenses Costs and Expenses Costs and Expenses Costs and Expenses, Related Party Gathering and processing costs of product/services sold at CEQP and CMLP(1) Counterparty Name [Axis] Counterparty Name [Axis] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Crestwood Equity Partners LP. Crestwood Equity Partners L P [Member] Crestwood Equity Partners LP Crestwood Gas Services GP, LLC [Member] Crestwood Gas Services G P L L C [Member] Crestwood Gas Services GP, LLC [Member] Crestwood Holdings [Member] Crestwood Holdings [Member] Crestwood Holdings [Member] Crestwood Long-Term Incentive Plan [Member] Crestwood Long Term Incentive Plan [Member] Crestwood LTIP Crestwood Marcellus Midstream LLC [Member] Crestwood Marcellus Midstream Llc [Member] Crestwood Marcellus Midstream LLC Crestwood Midstream Credit Facility [Member] Crestwood Midstream Credit Facility [Member] Crestwood Midstream Credit Facility Crestwood Midstream Long-Term Incentive Plan [Member] Crestwood Midstream Long Term Incentive Plan [Member] Crestwood Midstream Long-Term Incentive Plan Crestwood Midstream Partners LP. Crestwood Midstream Partners Lp [Member] Crestwood Midstream Partners LP Crestwood Midstream Revolver [Member] Crestwood Midstream Revolver [Member] Crestwood Midstream Revolver Crestwood Niobrara LLC [Member] Crestwood Niobrara L L C [Member] Crestwood Niobrara LLC Crestwood Permian Basin Holdings L L C [Member] Crestwood Permian Basin Holdings L L C [Member] Crestwood Permian Basin Holdings LLC Crestwood Permian Basin Holdings [Member] Crestwood Permian Basin Holdings [Member] Crestwood Permian Basin Holdings [Member] Current Federal Tax Expense (Benefit) Federal Current Income Tax Expense (Benefit) Total current Current Income Tax Expense (Benefit), Continuing Operations [Abstract] Current: Current State and Local Tax Expense (Benefit) State Customer Relationships [Member] Customer accounts Debt Disclosure [Abstract] Debt Disclosure [Abstract] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Basis Spread on Variable Rate Variable interest rate Long-term Debt, Gross Total payments due Debt Instrument, Fair Value Disclosure Fair value Debt Instrument, Fair Value Adjustment Debt Instrument Fair Value Adjustment Fair value adjustment Debt Instrument, Imputed Interest Debt Instrument Imputed Interest Inputed interest Debt Instrument, Interest Rate, Stated Percentage Debt Instrument, Interest Rate, Stated Percentage Debt Instrument [Line Items] Debt Instrument [Line Items] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument, Unamortized Discount Obligations under noncompete agreements, unamortized discount Debt Instrument, Unused Borrowing Capacity, Amount Debt Instrument, Unused Borrowing Capacity, Amount Debt, Long-term and Short-term, Combined Amount Total debt Debt, Weighted Average Interest Rate Debt, Weighted Average Interest Rate Deconsolidation, Gain (Loss), Amount Deconsolidation, Gain (Loss), Amount Deferred Charges, Policy [Policy Text Block] Deferred Financing Costs Deferred Federal Income Tax Expense (Benefit) Federal Debt Issuance Costs, Net Debt Issuance Costs, Net Deferred Finance Costs, Net Deferred Income Tax Expense (Benefit) Deferred income taxes Total deferred Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] Deferred: Deferred Tax Liabilities, Gross Total deferred tax liability Deferred Revenue, Current Deferred revenue Deferred State and Local Income Tax Expense (Benefit) State Deferred Tax Assets, Gross Total deferred tax asset Deferred Tax Assets, Net [Abstract] Deferred tax asset: Deferred Tax Assets, Other Basis difference in stock of company Deferred Tax Liabilities, Net Net deferred tax liability Deferred Tax Liabilities, Net [Abstract] Deferred tax liability: Deferred Tax Liabilities, Net, Noncurrent Deferred income taxes Deferred tax liabilities parents basis in acquisition. Deferred Tax Liabilities Parents Basis In Acquisition Basis difference in stock of acquired company Defined Benefit Plan, Contributions by Employer Defined Benefit Plan, Contributions by Employer Defined Benefit Plan, Employee Contributions, Statutory Maximum Per Employee Defined Benefit Plan Employee Contributions Statutory Maximum Per Employee Defined Benefit Plan, Employee Contributions, Statutory Maximum Per Employee Defined Contribution Plan, Employer Matching Contribution, Percent of Employees' Gross Pay Defined Contribution Plan, Employer Matching Contribution, Percent Defined Contribution Plan, Employer Matching Contribution, Percent of Match Employer matching contribution, percent Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent Maximum annual contributions per employee, percent Defined Contribution Plan, Maximum Purchasable Units Defined Contribution Plan Maximum Purchasable Units Maximum purchasable units Defined Contribution Plan Participants Basic Contribution Defined Contribution Plan Participants Basic Contribution Defined Contribution Plan Participants Basic Contribution Defined Contribution Plan, Requisite Service Period Defined Contribution Plan Requisite Service Period Defined Contribution Plan, Requisite Service Period Depletion Depletion Depreciation Depreciation Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset Netting agreements Derivative Asset, Fair Value of Collateral Derivative Asset, Fair Value of Collateral Derivative Asset Assets from price risk management, total Derivative Asset Derivative Asset, Current Assets from price risk management activities Derivative Contracts, Contracts Expiring in Next Twleve Months, Percent Derivative Contracts Contracts Expiring In Next Twleve Months Percent Percent of contracts expiring in next twelve months Derivative Contract [Domain] Derivative Contract [Domain] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract]