Accounting Policies [Abstract] Accounting Policies [Abstract] Accounts Payable, Current Accounts payable Accounts Payable Accounts payable Accounts Payable, Related Parties, Current Accounts payable Accounts Payable, Trade Accounts receivable-trade Accounts Receivable Intercompany Current Accounts Receivable Intercompany Current Accounts receivable-intercompany Accounts Receivable, Net, Current Accounts receivable Accounts Receivable, Related Parties, Current Accounts receivable 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 Commitmentsand Contingent Liabilities Accrued Commitmentsand Contingent Liabilities Commitments and contingent liabilities Accrued Expenses And Current Liabilities [Line Items] 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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 Receivable, Current Allowance for doubtful accounts Amended And Restated [Member] Amended And Restated [Member] Amended And Restated Amendment Flag Amendment Flag Amortization of Financing Costs and Discounts Amortization of debt-related deferred costs and premiums Amortization Of Intangible Assets And Interest Expense Amortization Of Intangible Assets And Interest Expense Amortization of Intangible Assets and Interest Expense 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 Arrow Acquisition Class Action Lawsuit [Member] Arrow Acquisition Class Action Lawsuit [Member] Arrow Acquisition Class Action Lawsuit Arrow [Member] Arrow [Member] Arrow Arrow Midstream Holdings L L C [Member] Arrow Midstream Holdings L L C [Member] Arrow Midstream Holdings, LLC Asset Retirement Obligation Net asset retirement obligation at December 31 Net asset retirement obligation at January 1 Assets retirement obligations 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) Acquisitions Asset Retirement Obligation, Revision of Estimate Changes in estimate 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 Assets Total 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Brookfield Infrastructure Group [Member] Building and Building Improvements [Member] Buildings, land, rights-of-way, storage contracts and easements Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Transaction Costs Transaction costs Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Business Acquisition, Equity Interest Issued or Issuable, Number of Shares Business Acquisition [Line Items] Business Acquisition [Line Items] Business Acquisition, Percentage of Voting Interests Acquired Percentage of voting interests acquired Business Acquisition, Pro Forma Information [Table Text Block] Business Acquisition, Pro Forma Information Business Acquisition, Pro Forma Net Income (Loss) Net income (loss) Business Acquisition, Pro Forma Revenue Revenues Business Combination Cash Paymentsto Unitholders Upon Completionof Merger Business Combination Cash Paymentsto Unitholders Upon Completionof Merger Cash payments to unitholders upon completion of merger Business Combination Cash Paymentsto Unitholders Upon Completionof Merger Per Unit Business Combination Cash Paymentsto Unitholders Upon Completionof Merger Per Unit Cash payments to unitholders upon completion of merger, per unit Business Combination Central Delivery Point Acquired Asset Area Business Combination Central Delivery Point Acquired Asset Area Central delivery point acquired (in acres) Business Combination, Consideration Transferred Consideration transferred Business Combination, Consideration Transferred, Liabilities Incurred Liabilities incurred Business Combination, Consideration Transferred, Other Other consideration transferred 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 Issuedor Issuable Conversion Ratio Business Combination Equity Interest Issuedor Issuable Conversion Ratio Conversion ratio Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual Operating income of acquiree since acquisition date Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual Revenue of acquiree since acquisition date Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets Total identifiable assets acquired Business Combination Recognized Identifiable Assets Acquiredand 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 Acquiredand 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, Current Assets Current assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other Other assets Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities Current liabilities Business Combination Recognized Identifiable Assets Acquiredand 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, Finite-Lived Intangibles Intangible assets Business Combination Recognized Identifiable Assets Acquiredand 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, Liabilities Total liabilities assumed Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net Net identifiable assets acquired Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt Long-term debt Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other Other long-term liabilities Business Combination Recognized Identifiable Assets Acquiredand 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 Acquiredand Liabilities Assumed Service Vehicles Business Combination Recognized Identifiable Assets Acquiredand Liabilities Assumed Service Vehicles Number of Service Vehicles Business Combination Recognized Identifiable Assets Acquiredand Liabilities Assumed Tractors Business Combination Recognized Identifiable Assets Acquiredand Liabilities Assumed Tractors Number of Tractors Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net Net assets acquired Business Combinations [Abstract] Business Combinations [Abstract] Call Premium On Debt Redemption Call Premium On Debt Redemption Call Premium On Debt Redemption Capital Expenditures Incurred but Not yet Paid Net change to property, plant and equipment through accounts payable and accrued expenses Capital Leased Assets, Gross Capital Leased Assets, Gross Capital Unit Class C [Member] Capital Unit Class C [Member] Class C Units Capital Unit Class D [Member] Capital Unit Class D [Member] Class D Units Capital Unit, Class [Domain] Capital Unit, Class [Domain] Capital Units by Class [Axis] Capital Units by Class [Axis] 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 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 Acquisitions Current Assets Cash Flow Acquisitions Current Assets Current assets Cash Flow Acquisitions Intangible Assets Cash Flow Acquisitions Intangible Assets Intangible assets Cash Flow Acquisitions Property Plant And Equipment Cash Flow Acquisitions Property Plant And Equipment Property, plant and equipment Cash Flow Current Liabilities Acquisitions Cash Flow Current Liabilities Acquisitions Current liabilities Cash Flow Goodwill Acquisitions Cash Flow Goodwill Acquisitions Goodwill Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Supplemental schedule of non-cash investing and financing activities C E G P [Member] C E G P [Member] CEGP C E Q P Credit Facility [Member] C E Q P Credit Facility [Member] CEQP Credit Facility C E Q P Senior Notes [Member] C E Q P Senior Notes [Member] CEQP Senior Notes Change in Accounting Estimate [Line Items] Change in Accounting Estimate [Line Items] Class A Purchasers [Member] Class A Purchasers [Member] Class A Purchasers Class of Stock [Domain] Class of Stock [Domain] C M L P [Member] C M L P [Member] CMLP Collateral Already Posted, Aggregate Fair Value Collateral posted for commodity derivative instruments C O L T [Member] C O L T [Member] COLT 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 Stock, Shares, Issued Common units, issued Common Stock, Shares, Outstanding Common units, outstanding Common Unit Capital [Member] Common Unit Capital [Member] Common Unit Capital Common Unit, Outstanding Common Unit, Outstanding Common Unit, Outstanding 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 Components of Net Income (Loss) Attributable to Non-Controlling Partners [Table Text Block] Componentsof Net Income Loss Attributableto Non Controlling Partners Table [Text Block] Components of Net Income (Loss) Attributable to Non-Controlling Partners Comprehensive Income (Loss), Net of Tax, Attributable to Parent Comprehensive income (loss) attributable to Crestwood Equity Partners LP Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Concentration Risk, Credit Risk, Policy [Policy Text Block] Credit Risk and Concentrations Concentration Risk, Percentage Concentration Risk, Percentage Condensed Balance Sheet Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Condensed Balance Sheet Statement [Table] Condensed Balance Sheet Statement [Table] Condensed Cash Flow Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Condensed Cash Flow Statement [Table] Condensed Cash Flow Statement [Table] 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 I - Crestwood Equity Partners LP - Parent Only Condensed Financial Information of Subsidiaries Disclosure [Abstract] Condensed Financial Information of Subsidiaries Disclosure [Abstract] Condensed Financial Information of Subsidiaries Disclosure [Abstract] Condensed Income Statements, Captions [Line Items] Condensed Financial Statements, Captions [Line Items] Condensed Income Statement [Table] Condensed Income Statement [Table] Condensed Statement of Comprehensive Income [Table] Condensed Statement of Comprehensive Income [Table] Condensed Statement of Income 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, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent Distribution for additional interest in Crestwood Marcellus Midstream LLC Construction in Progress [Member] Construction in process Contracts Scenario [Axis] Contracts Scenario [Axis] Contracts Scenario [Axis] Contracts Scenario [Domain] Contracts Scenario [Domain] Contracts Scenario [Domain] 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 Revenue Costs of product/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 Agreement [Member] Credit Agreement [Member] Credit Agreement Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Crestwood Equity Partners L P [Member] Crestwood Equity Partners L P [Member] Crestwood Equity Partners LP Crestwood Gas Services G P L L C [Member] Crestwood Gas Services G P L L C [Member] Crestwood Gas Services GP, LLC [Member] Crestwood Holdings [Member] Crestwood Holdings [Member] Crestwood Holdings Crestwood Long Term Incentive Plan [Member] Crestwood Long Term Incentive Plan [Member] Crestwood Long-Term Incentive Plan 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 Revolver [Member] Crestwood Midstream Revolver [Member] Crestwood Midstream Revolver Crestwood Niobrara L L C [Member] Crestwood Niobrara L L C [Member] Crestwood Niobrara LLC Crestwood Operations L L C [Member] Crestwood Operations L L C [Member] Crestwood Operations LLC Crude Logistics L L C [Member] Crude Logistics L L C [Member] Crude Logistics L L C [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