Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments, Gain (Loss) [Table] Derivative Instruments, Gain (Loss) [Table] Derivative Instrument [Axis] Derivative Instrument [Axis] Derivative Contract [Domain] Derivative Contract [Domain] Commodity contract Commodity Contract [Member] Derivative Instruments, Gain (Loss) [Line Items] Derivative Instruments, Gain (Loss) [Line Items] Gain (loss) on derivative instruments not designated as hedging Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net Derivative Instruments Not Designated as Hedging Instruments, Revenue Derivative Instruments Not Designated as Hedging Instruments, Revenue Derivative Instruments Not Designated as Hedging Instruments, Revenue Revenue Recognition [Abstract] Contract with Customer, Asset and Liability [Table Text Block] Contract with Customer, Asset and Liability [Table Text Block] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block] Disaggregation of Revenue Disaggregation of Revenue [Table Text Block] Segment Reporting [Abstract] Schedule of Segment Reporting Information, by Segment [Table] Schedule of Segment Reporting Information, by Segment [Table] Legal Entity [Axis] Legal Entity [Axis] Entity [Domain] Entity [Domain] Crestwood Equity Partners LP Crestwood Equity Partners LP [Member] Crestwood Equity Partners LP [Member] Crestwood Midstream Partners LP Crestwood Midstream Partners LP [Member] Crestwood Midstream Partners LP [Member] Segment Reporting Information [Line Items] Segment Reporting Information [Line Items] Interest, taxes, depreciation and amortization included in earnings from equity method investments Interest, Taxes, Depreciation and Amortization included in Earnings from Equity Method Investments Interest, Taxes, Depreciation and Amortization included in Earnings from Equity Method Investments Revenue Recognition Revenue from Contract with Customer [Text Block] Leases [Abstract] Lessee, Lease, Description [Table] Lessee, Lease, Description [Table] Lease Arrangement [Axis] Lease Arrangement [Axis] Lease Arrangement [Axis] Lease Arrangement [Domain] Lease Arrangement [Domain] [Domain] for Lease Arrangement [Axis] Operating Leases Operating Leases [Member] Operating Leases [Member] Finance Lease Finance Lease [Member] Finance Lease [Member] Lessee, Lease, Description [Line Items] Lessee, Lease, Description [Line Items] Operating Lease, Expense Operating Lease, Expense Operating lease, right-of-use assets, net Operating Lease, Right-of-Use Asset Accrued expenses and other liabilities Accrued Liabilities, Current Long-term operating lease liabilities Operating Lease, Liability, Noncurrent Operating lease, liability Operating Lease, Liability Property, plant and equipment Property, Plant and Equipment, Gross Less: accumulated depreciation Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment Property, plant and equipment, net Property, Plant and Equipment, Net Other long-term liabilities Other Liabilities, Noncurrent Finance Lease, Liability Finance Lease, Liability Finance Lease Expense Finance Lease Expense Finance Lease Expense Earnings Per Share [Abstract] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] Statement of Financial Position [Abstract] Statement [Table] Statement [Table] Statement [Line Items] Statement [Line Items] Assets Assets [Abstract] Cash Cash and Cash Equivalents, at Carrying Value Accounts receivable, less allowance for doubtful accounts of $0.6 million and $0.3 million at March 31, 2020 and December 31, 2019 Accounts Receivable, after Allowance for Credit Loss, Current Inventory Inventory, Gross Assets from price risk management activities Derivative Asset, Current Prepaid expenses and other current assets Prepaid Expense and Other Assets, Current Total current assets Assets, Current Intangible assets Intangible Assets, Gross (Excluding Goodwill) Less: accumulated amortization Finite-Lived Intangible Assets, Accumulated Amortization Intangible assets, net Intangible Assets, Net (Excluding Goodwill) Goodwill Goodwill Investments in unconsolidated affiliates Equity Method Investments Other non-current assets Other Assets, Noncurrent Total assets Assets Liabilities and capital Liabilities and Equity [Abstract] Current liabilities: Liabilities, Current [Abstract] Accounts payable Accounts Payable, Current Liabilities from price risk management activities Derivative Liability, Current Current portion of long-term debt Long-term Debt, Current Maturities Total current liabilities Liabilities, Current Long-term debt, less current portion Long-term Debt, Excluding Current Maturities Deferred income taxes Deferred Income Tax Liabilities, Net Total liabilities Liabilities Commitments and contingencies (Note 10) Commitments and Contingencies Interest of non-controlling partner in subsidiary Temporary Equity, Carrying Amount, Including Portion Attributable to Noncontrolling Interests Partners’ capital: Partners' Capital [Abstract] Crestwood Equity Partners LP partners’ capital (73,703,476 and 72,282,942 common and subordinated units issued and outstanding at March 31, 2020 and December 31, 2019) Limited Partners' Capital Account Preferred units (71,257,445 units issued and outstanding at both March 31, 2020 and December 31, 2019) Preferred Units, Preferred Partners' Capital Accounts Partners' capital Partners' Capital Interest of non-controlling partner in subsidiary (Note 9) Partners' Capital Attributable to Noncontrolling Interest Total partners’ capital Partners' Capital, Including Portion Attributable to Noncontrolling Interest Total liabilities and capital Liabilities and Equity Revenue, Remaining Performance Obligation, Amount Revenue, Remaining Performance Obligation, Amount Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items] Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Period Fair Value Disclosures [Abstract] Fair Value Measurements Fair Value Measurement and Measurement Inputs, Recurring and Nonrecurring [Text Block] Condensed Financial Information Disclosure [Abstract] Consolidated Entities [Axis] Consolidated Entities [Axis] Consolidated Entities [Domain] Consolidated Entities [Domain] Non-Guarantor Subsidiaries Non-Guarantor Subsidiaries [Member] Parent Company, Crestwood Midstream Partners, LP Parent Company, Crestwood Midstream Partners, LP [Member] Parent Company, Crestwood Midstream Partners, LP [Member] Guarantor Subsidiaries Guarantor Subsidiaries [Member] Consolidation Items [Axis] Consolidation Items [Axis] Consolidation Items [Domain] Consolidation Items [Domain] Reportable Legal Entities Reportable Legal Entities [Member] Eliminations Consolidation, Eliminations [Member] Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities Cash flows from investing activities: Net Cash Provided by (Used in) Investing Activities [Abstract] Purchases of property, plant and equipment Payments to Acquire Property, Plant, and Equipment Investment in unconsolidated affiliates Payments to Acquire Equity Method Investments Capital distributions from consolidated affiliates Contributions to (Distributions from) Consolidated Affiliates Contributions to (Distributions from) Consolidated Affiliates Payments for (Proceeds from) Other Investing Activities Payments for (Proceeds from) Other Investing Activities Proceeds from Equity Method Investment, Distribution, Return of Capital Proceeds from Equity Method Investment, Distribution, Return of Capital 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] Proceeds from the issuance of long-term debt Proceeds from Issuance of Long-term Debt Payments on long-term debt Repayments of Long-term Debt Payments on finance leases Finance Lease, Principal Payments Payments on capital leases Repayments of Long-term Capital Lease Obligations Payments for deferred financing costs Payments of Debt Issuance Costs Distributions to partners Payments of Capital Distribution Contributions from (distributions to) parent Contributions from (Distributions to) Parent Contributions from (Distributions to) Parent Taxes paid for unit-based compensation vesting Payment, Tax Withholding, Share-based Payment Arrangement Change in intercompany balances Increase (Decrease) in Accounts Payable, Related Parties Other Proceeds from (Payments for) Other Financing Activities Net cash provided by (used in) financing activities Net Cash Provided by (Used in) Financing Activities Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents Equity Method Investments and Joint Ventures [Abstract] Schedule of Equity Method Investments [Table] Schedule of Equity Method Investments [Table] Crestwood Niobrara LLC Crestwood Niobrara LLC [Member] Crestwood Niobrara LLC [Member] Ownership [Axis] Ownership [Axis] Ownership [Domain] Ownership [Domain] Williams Partners LP Williams Partners LP [Member] Williams Partners LP [Member] Equity Method Investee, Name [Axis] Investment, Name [Axis] Investment, Name [Domain] Investment, Name [Domain] Jackalope Gas Gathering Services, L.L.C. Jackalope Gas Gathering Services, L.L.C. [Member] Jackalope Gas Gathering Services, L.L.C. [Member] Stagecoach Gas Services LLC Stagecoach Gas Services LLC [Member] Stagecoach Gas Services LLC [Member] Crestwood Permian Basin Holdings LLC Crestwood Permian Basin Holdings LLC [Member] Crestwood Permian Basin Holdings LLC [Member] Other Equity Method Investments Other Equity Method Investments [Member] Other Equity Method Investments [Member] Tres Palacios Holdings LLC Tres Palacios Holdings LLC [Member] Tres Palacios Holdings LLC [Member] Powder River Basin Industrial Complex, LLC Powder River Basin Industrial Complex, LLC [Member] Powder River Basin Industrial Complex, LLC [Member] Schedule of Equity Method Investments [Line Items] Schedule of Equity Method Investments [Line Items] Business Acquisition, Percentage Of Additional Voting Interests Acquired Business Acquisition, Percentage Of Additional Voting Interests Acquired Business Acquisition, Percentage Of Additional Voting Interests Acquired Operating Revenues Equity Method Investment, Summarized Financial Information, Revenue Operating Expenses Equity Method Investment Summarized Financial Information Operating Expenses Equity Method Investment Summarized Financial Information Operating Expenses Net Income (Loss) Equity Method Investment, Summarized Financial Information, Net Income (Loss) Amortization Amortization Commitments and Contingencies Disclosure [Abstract] Purchase Commitment, Excluding Long-term Commitment [Table] Purchase Commitment, Excluding Long-term Commitment [Table] Statistical Measurement [Axis] Statistical Measurement [Axis] Statistical Measurement [Domain] Statistical Measurement [Domain] Maximum Maximum [Member] Minimum Minimum [Member] Litigation Case [Axis] Litigation Case [Axis] Litigation Case Type [Domain] Litigation Case [Domain] Business Acquisition [Axis] Business Acquisition [Axis] Business Acquisition, Acquiree [Domain] Business Acquisition, Acquiree [Domain] Purchase Commitment, Excluding Long-term Commitment [Line Items] Purchase Commitment, Excluding Long-term Commitment [Line Items] Loss Contingency, Damages Sought, Value Loss Contingency, Damages Sought, Value Self Insurance Reserve Self Insurance Reserve Self Insurance Reserve Expected To Be Paid Subsequent To Next Fiscal Year Self Insurance Reserve Expected To Be Paid Subsequent To Next Fiscal Year Self insurance reserve expected to be paid subsequent to next fiscal year. Loss Contingency Accrual, at Carrying Value Loss Contingency Accrual Site Contingency, Loss Exposure, Release of Produced Water Site Contingency, Loss Exposure, Release of Produced Water Site Contingency, Loss Exposure, Release of Produced Water Balance Sheet Related Disclosures [Abstract] Certain Balance Sheet Information Supplemental Balance Sheet Disclosures [Text Block] Subsequent Event [Abstract] Subsequent Event [Abstract] Subsequent Event Subsequent Events [Text Block] Subsequent Event [Table] Subsequent Event [Table] Plains All American Pipeline, L.P. [Member] Plains All American Pipeline, L.P. [Member] Plains All American Pipeline, L.P. [Member] Subsequent Event Type [Axis] Subsequent Event Type [Axis] Subsequent Event Type [Domain] Subsequent Event Type [Domain] Subsequent Event Subsequent Event [Member] Subsequent Event [Line Items] Subsequent Event [Line Items] Business Combination, Consideration Transferred Business Combination, Consideration Transferred Condensed Consolidating Financial Information Condensed Consolidating Financial Information Disclosure [Text Block] Condensed Consolidating Financial Information Disclosure [Text Block] Disclosure Partnership Organization And Basis Of Presentation Narrative [Abstract] Disclosure - Partnership Organization And Basis Of Presentation (Narrative) [Abstract] Organization and Business Description Partnership Organization And Basis Of Presentation [Text Block] Description of the organization structure, consolidation principles and nature of operations of the limited liability company or limited partnership. Fair Value, Recurring and Nonrecurring [Table] Fair Value, Recurring and Nonrecurring [Table] Fair Value Hierarchy and NAV [Axis] Fair Value Hierarchy and NAV [Axis] Fair Value, Measurements, Fair Value Hierarchy [Domain] Fair Value Hierarchy and NAV [Domain] Level 1 Fair Value, Inputs, Level 1 [Member] Level 2 Fair Value, Inputs, Level 2 [Member] Level 3 Fair Value, Inputs, Level 3 [Member] Measurement Frequency [Axis] Measurement Frequency [Axis] Measurement Frequency [Domain] Measurement Frequency [Domain] Fair Value, Measurements, Recurring Fair Value, Recurring [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] Assets from price risk management Price Risk Derivative Assets, at Fair Value SPH units Investment Owned, at Fair Value Assets, Fair Value Disclosure, Excluding Netting Adjustments Assets, Fair Value Disclosure, Excluding Netting Adjustments Assets, Fair Value Disclosure, Excluding Netting Adjustments Netting agreements Derivative Asset, Fair Value, Gross Liability and Obligation to Return Cash, Offset Derivative Asset, Fair Value of Collateral Derivative Asset, Fair Value of Collateral Assets from price risk management, total Derivative Asset Total assets at fair value Assets, Fair Value Disclosure Liabilities from price risk management Price Risk Derivative Liabilities, at Fair Value Liabilities, Fair Value Disclosure, Excluding Netting Adjustments Liabilities, Fair Value Disclosure, Excluding Netting Adjustments Liabilities, Fair Value Disclosure, Excluding Netting Adjustments Netting agreements Derivative Liability, Fair Value, Gross Asset and Right to Reclaim Cash, Offset Derivative Liability, Fair Value of Collateral Derivative Liability, Fair Value of Collateral Liabilities from price risk management, total Derivative Liability Risk Management - Notional Amounts and Terms of Companys Derivative Financial Instruments [Abstract] Risk Management - Notional Amounts and Terms of Companys Derivative Financial Instruments [Abstract] Derivative [Table] Derivative [Table] Derivative Contract Type [Domain] Price Risk Contracts Member Price Risk Contracts Member Price Risk Contracts [Member] Derivative [Line Items] Derivative [Line Items] Remaining maturity Derivative, Remaining Maturity Percent of contracts expiring in the next twelve months Derivative Contracts, Contracts Expiring in Next Twelve Months, Percent Derivative Contracts, Contracts Expiring in Next Twelve Months, Percent Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Schedule of Earnings Per Share, Basic, by Common Class, Including Two Class Method [Table] Class of Stock [Axis] Class of Stock [Axis] Class of Stock [Domain] Class of Stock [Domain] Preferred Units Preferred Units [Member] Preferred Units [Member] Performance Shares Performance Shares [Member] Subordinated Units Subordinated Units [Member] Subordinated Units [Member] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items] Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount Crestwood Permian Basin Holdings Crestwood Permian Basin Holdings [Member] Crestwood Permian Basin Holdings [Member] Business Combination, Contingent Consideration, Liability Business Combination, Contingent Consideration, Liability Business Combination, Contingent Consideration, Liability, Current Business Combination, Contingent Consideration, Liability, Current Business Combination, Contingent Consideration, Liability, Noncurrent Business Combination, Contingent Consideration, Liability, Noncurrent Guarantor Obligations, Maximum Exposure, Undiscounted Guarantor Obligations, Maximum Exposure, Undiscounted Ownership percentage Equity Method Investment, Ownership Percentage Payments to Acquire Property, Plant, and Equipment Schedule of Business Acquisitions, by Acquisition [Table] Schedule of Business Acquisitions, by Acquisition [Table] Business Acquisition [Line Items] Business Acquisition [Line Items] Contract Assets (Non-current) Contract with Customer, Asset, Gross, Noncurrent Contract Liabilities (Current) Contract with Customer, Liability, Current Contract Liabilities (Non-current) Contract with Customer, Liability, Noncurrent Contract with Customer, Liability, Revenue Recognized Contract with Customer, Liability, Revenue Recognized Statement of Partners' Capital [Abstract] Schedule of Distributions Made to Members or Limited Partners, by Distribution Distributions Made to Limited Partner, by Distribution [Table Text Block] Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Table Text Block] Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Effects of Changes, Net [Table Text Block] Statement of Cash Flows [Abstract] Operating activities Net Cash Provided by (Used in) Operating Activities [Abstract] Net income (loss) Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Adjustments to reconcile net income (loss) to net cash provided by operating activities: Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Depreciation, amortization and accretion Other Depreciation and Amortization Amortization of debt-related deferred costs Amortization of Debt Issuance Costs and Discounts Unit-based compensation charges Unit Based Compensation Charges Unit Based Compensation Charges Loss on long-lived assets, net Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property Goodwill, Impairment Loss Goodwill, Impairment Loss Earnings from unconsolidated affiliates, net, adjusted for cash distributions received Income (Loss) from Equity Method Investments, Net of Dividends or Distributions Deferred income taxes Deferred Income Tax Expense (Benefit) Changes in operating assets and liabilities Increase (Decrease) in Other Operating Assets and Liabilities, Net Net cash provided by operating activities Investing activities Purchases of property, plant and equipment Capital distributions from unconsolidated affiliates Financing activities Distributions to non-controlling partner Payments of Ordinary Dividends, Noncontrolling Interest Distributions to preferred unitholders Payments of Ordinary Dividends, Preferred Stock and Preference Stock Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect Cash at beginning of period Cash at end of period Supplemental schedule of noncash investing activities Cash Flow, Noncash Investing and Financing Activities Disclosure [Abstract] Net change to property, plant and equipment through accounts payable and accrued expenses Capital Expenditures Incurred but Not yet Paid Disaggregation of Revenue [Table] Disaggregation of Revenue [Table] Product and Service [Axis] Product and Service [Axis] Product and Service [Domain] Product and Service [Domain] Product and Service, Other Product and Service, Other [Member] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Axis] Concentration Risk Benchmark [Domain] Concentration Risk Benchmark [Domain] Revenue from Contract with Customer Revenue from Contract with Customer Benchmark [Member] Intersegment Eliminations Intersegment Eliminations [Member] Subsegments Consolidation Items [Axis] Subsegments Consolidation Items [Axis] Subsegments Consolidation Items [Domain] Subsegments Consolidation Items [Domain] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Axis] Contract with Customer, Basis of Pricing [Domain] Contract with Customer, Basis of Pricing [Domain] Natural Gas Gathering Natural Gas Gathering [Member] Natural Gas Gathering [Member] Crude Oil Gathering Crude Oil Gathering [Member] Crude Oil Gathering [Member] Water Gathering Water Gathering [Member] Water Gathering [Member] Natural Gas Processing Natural Gas Processing [Member] Natural Gas Processing [Member] Natural Gas Compression Natural Gas Compression [Member] Natural Gas Compression [Member] Crude Oil Storage Crude Oil Storage [Member] Crude Oil Storage [Member] NGL Storage NGL Storage [Member] NGL Storage [Member] Crude Oil Pipeline Crude Oil Pipeline [Member] Crude Oil Pipeline [Member] Crude Oil Transportation Crude Oil Transportation [Member] Crude Oil Transportation [Member] NGL Transportation NGL Transportation [Member] NGL Transportation [Member] Crude Oil Rail Loading Crude Oil Rail Loading [Member] Crude Oil Rail Loading [Member] Natural Gas Product Sales Natural Gas Product Sales [Member] Natural Gas Product Sales [Member] Crude Oil Product Sales Crude Oil Product Sales [Member] Crude Oil Product Sales [Member] NGL Product Sales NGL Product Sales [Member] NGL Product Sales [Member] Other revenue Other revenue [Member] Other revenue [Member] Segments [Axis] Segments [Axis] Segments [Domain] Segments [Domain] Gathering and Processing Operations Gathering and Processing Segment [Member] Gathering and Processing Segment [Member] Storage and Transportation Storage And Transportation Operations [Member] Storage And Transportation Operations [Member] Marketing Supply and Logistics Marketing Supply and Logistics [Member] Marketing Supply and Logistics [Member] Disaggregation of Revenue [Line Items] Disaggregation of Revenue [Line Items] Revenue from Contract with Customer, Excluding Assessed Tax Revenue from Contract with Customer, Excluding Assessed Tax Non-Topic 606 revenues Revenue Not from Contract with Customer Revenues Revenues Revenue including intersegment eliminations Revenue including intersegment eliminations Revenue including intersegment eliminations Related Party Transactions [Abstract] Related Party Transactions Related Party Transactions Disclosure [Text Block] Accounting Policies [Abstract] Schedule of Goodwill [Table Text Block] Schedule of Goodwill [Table Text Block] Condensed Balance Sheet Condensed Balance Sheet [Table Text Block] Condensed Income Statement Condensed Income Statement [Table Text Block] Condensed Cash Flow Statement Condensed Cash Flow Statement [Table Text Block] Cover [Abstract] Document Information [Table] Document Information [Table] Common Units Common Units [Member] Common Units [Member] Document Information [Line Items] Document Information [Line Items] Document Transition Report Document Transition Report Document Quarterly Report Document Quarterly Report Entity Shell Company Entity Shell Company Entity Interactive Data Current Entity Interactive Data Current Entity Current Reporting Status Entity Current Reporting Status Title of 12(b) Security Title of 12(b) Security Entity Address, Address Line One Entity Address, Address Line One Document Type Document Type Amendment Flag Amendment Flag Document Period End Date Document Period End Date Document Fiscal Year Focus Document Fiscal Year Focus Document Fiscal Period Focus Document Fiscal Period Focus Trading Symbol Trading Symbol Entity Registrant Name Entity Registrant Name Entity File Number Entity File Number Entity Incorporation, State or Country Code Entity Incorporation, State or Country Code Entity Tax Identification Number Entity Tax Identification Number Entity Central Index Key Entity Central Index Key Current Fiscal Year End Date Current Fiscal Year End Date Entity Emerging Growth Company Entity Emerging Growth Company Entity Small Business Entity Small Business Entity Filer Category Entity Filer Category Entity Common Stock, Shares Outstanding Entity Common Stock, Shares Outstanding Entity Address, Address Line Two Entity Address, Address Line Two Entity Address, City or Town Entity Address, City or Town Entity Address, State or Province Entity Address, State or Province Entity Address, Postal Zip Code Entity Address, Postal Zip Code City Area Code City Area Code Local Phone Number Local Phone Number Security Exchange Name Security Exchange Name ASC 606 accounts receivable ASC 606 Accounts Receivable ASC 606 Accounts Receivable Schedule of Long-term Debt Instruments [Table] Schedule of Long-term Debt Instruments [Table] Debt Instrument [Axis] Debt Instrument [Axis] Debt Instrument, Name [Domain] Debt Instrument, Name [Domain] Senior Notes, 2023 Senior Notes, 2023 [Member] Senior Notes, 2023 [Member] Senior Notes, 2025 Senior Notes, 2025 [Member] Senior Notes, 2025 [Member] Senior Notes, due 2027 Senior Notes, due 2027 [Member] Senior Notes, 2027 [Member] Crestwood Midstream Partners LP Debt Instrument [Line Items] Debt Instrument [Line Items] Carrying amount Senior Notes Fair value Debt Instrument, Fair Value Disclosure Disclosure Long Term Debt Components Of Long Term Debt [Abstract] Disclosure - Long-Term Debt (Components Of Long-Term Debt) [Abstract] Credit Facility [Axis] Credit Facility [Axis] Credit Facility [Domain] Credit Facility [Domain] Revolving Credit Facility Revolving Credit Facility [Member] Long-term Debt, Type [Axis] Long-term Debt, Type [Axis] Long-term Debt, Type [Domain] Long-term Debt, Type [Domain] Senior Notes Senior Notes [Member] Other Other Liabilities [Member] Crestwood Midstream Revolver Crestwood Midstream Revolver [Member] Crestwood Midstream Revolver [Member] Credit Facility Long-term Line of Credit Senior notes Other Other Long-term Debt Deferred finance costs, net Debt Issuance Costs, Net Total debt Debt, Long-term and Short-term, Combined Amount Less: current portion Total long-term debt, less current portion Costs of product/services sold Cost of Revenue Operating expenses and other: Operating Expenses [Abstract] Operations and maintenance Operating Costs and Expenses General and administrative General and Administrative Expense Loss on long-lived assets, net Goodwill, Impairment Loss Total expenses Operating Expenses Operating income (loss) Operating Income (Loss) Earnings from unconsolidated affiliates, net Income (Loss) from Equity Method Investments Interest and debt expense, net Interest Expense Loss from unconsolidated affiliates Income (Loss) from Subsidiaries, before Tax Net income (loss) Net income attributable to non-controlling partner in subsidiary Net Income (Loss) Attributable to Noncontrolling Interest Net income (loss) attributable to parent Net Income (Loss) Attributable to Parent Basis of Presentation and Significant Accounting Policies Basis of Presentation and Significant Accounting Policies [Text Block] Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Table] Reconciliation of Other Significant Reconciling Items from Segments to Consolidated [Table] Segment Reporting, Other Significant Reconciling Item [Line Items] Segment Reporting, Other Significant Reconciling Item [Line Items] Number of Operating Segments Number of Operating Segments Interest and debt expense, net Interest Income (Expense), Net EBITDA Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Excluding Interest, Taxes, Depreciation And Amortization Net Income (Loss), Including Portion Attributable to Noncontrolling Interest Excluding Interest, Taxes, Depreciation And Amortization Disclosure Long Term Debt Narrative [Abstract] Disclosure - Long-Term Debt (Narrative) [Abstract] Lender Name [Axis] Lender Name [Axis] Line of Credit Facility, Lender [Domain] Line of Credit Facility, Lender [Domain] Available capacity Debt Instrument, Unused Borrowing Capacity, Amount Letters of credit outstanding Letters of Credit Outstanding, Amount Debt, Weighted Average Interest Rate Debt, Weighted Average Interest Rate Consolidated Leverage Ratio Maximum Consolidated Leverage Ratio Maximum Consolidated Leverage Ratio Maximum. Interest Coverage Ratio Minimum Interest Coverage Ratio Minimum Interest Coverage Ratio, Minimum Senior Secured Leverage Ratio, maximum Senior Secured Leverage Ratio, maximum Senior Secured Leverage Ratio, maximum Total Funded Debt to Consolidated Ebitda Total Funded Debt to Consolidated Ebitda Total funded debt to consolidated EBITDA (as defined in the Credit Agreement) Consolidated Ebitda To Consolidated Interest Expense Consolidated Ebitda To Consolidated Interest Expense Consolidated EBITDA to consolidated interest expense (as defined in the Credit Agreement) Senior Secured Leverage Ratio Senior Secured Leverage Ratio Senior Secured Leverage Ratio Current assets: Assets, Current [Abstract] Accounts receivable Other Other Assets, Current Property, plant and equipment, net Goodwill and intangible assets, net Intangible Assets, Net (Including Goodwill) Investment in consolidated affiliates Investment in Consolidated Subsidiaries Investment in Consolidated Subsidiaries Investment Other current liabilities Other Liabilities, Current Long-term liabilities: Liabilities, Noncurrent [Abstract] Partners' capital Allowance for doubtful accounts Accounts Receivable, Allowance for Credit Loss, Current Limited Partners' Capital Account, Units Issued Limited Partners' Capital Account, Units Issued Limited Partners' Capital Account, Units Outstanding Limited Partners' Capital Account, Units Outstanding Preferred Units, Issued Preferred Units, Issued Preferred Units, Outstanding Preferred Units, Outstanding Significant Accounting Policies Significant Accounting Policies [Text Block] New Accounting Pronouncements Issued But Not Yet Adopted New Accounting Pronouncements, Policy [Policy Text Block] Statement of Comprehensive Income [Abstract] Change in fair value of Suburban Propane Partners, L.P. units Other Comprehensive Income (Loss), Securities, Available-for-Sale, Unrealized Holding Gain (Loss) Arising During Period, after Tax Comprehensive income (loss) Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest Comprehensive income attributable to non-controlling partner Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest Comprehensive income (loss) attributable to Crestwood Equity Partners LP Comprehensive Income (Loss), Net of Tax, Attributable to Parent Propane Crude And Heating Oil Propane Crude Ethane Butane And Heating Oil [Member] Propane, Crude, Ethane, Butane And Heating Oil [Member] Natural Gas [Member] Natural Gas [Member] Fixed Price Payor Fixed Price Payor [Member] Fixed Price Payor [Member] Fixed Price Receiver Fixed Price Receiver [Member] Fixed Price Receiver [Member] Derivative, notional amount Derivative, Nonmonetary Notional Amount Schedule of Related Party Transactions Schedule of Related Party Transactions [Table Text Block] Schedule of Related Party Receivables and Payables Schedule of Related Party Receivables and Payables [Table Text Block] Schedule of Related Party Receivables and Payables [Table Text Block] Schedule of Carrying Values and Estimated Fair Values of Debt Instruments Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block] Assets And Liabilities Measured At Fair Value On Recurring Basis Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Accrued Expenses and Other Liabilities [Table] Accrued Expenses and Other Liabilities [Table] Accrued Expenses and Other Liabilities [Table] Balance Sheet Location [Axis] Balance Sheet Location [Axis] Balance Sheet Location [Domain] Balance Sheet Location [Domain] Other Noncurrent Liabilities [Member] Other Noncurrent Liabilities [Member] Related Party [Axis] Related Party [Axis] Related Party [Domain] Related Party [Domain] Accrued Expenses and Other Liabilities [Line Items] Accrued Expenses and Other Liabilities [Line Items] [Line Items] for Accrued Expenses and Other Liabilities [Table] Accrued expenses Other Accrued Liabilities, Current Accrued property taxes Accrual for Taxes Other than Income Taxes, Current Tax payable Taxes Payable, Current Interest payable Interest Payable Accrued additions to property, plant and equipment Accrued Capital Purchases Accrued Capital Purchases Operating Lease, Liability, Current Operating Lease, Liability, Current Capital leases Accrued Capital Leases Accrued Capital Leases Finance Lease, Liability, Current Finance Lease, Liability, Current Deferred Revenue Total accrued expenses and other liabilities Asset Retirement Obligations, Noncurrent Asset Retirement Obligations, Noncurrent Risk Management Derivative Instruments and Hedging Activities Disclosure [Text Block] Earnings Per Limited Partner Unit Earnings Per Share [Text Block] Purchase Commitment, Excluding Long-term Commitment [Table Text Block] Purchase Commitment, Excluding Long-term Commitment [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Assets And Liabilities, Lessee [Table Text Block] Noncontrolling Interest [Abstract] Temporary Equity, by Class of Stock [Table] Temporary Equity, by Class of Stock [Table] Equity Components [Axis] Equity Components [Axis] Equity Component [Domain] Equity Component [Domain] Non-Controlling Partners Non Controlling Partners [Member] Non-Controlling Partners [Member] Partner Capital Components [Axis] Partner Capital Components [Axis] Partner Capital Components [Domain] Partner Capital Components [Domain] Temporary Equity [Line Items] Temporary Equity [Line Items] Increase (Decrease) in Temporary Equity [Roll Forward] Increase (Decrease) in Temporary Equity [Roll Forward] Temporary Equity, Net Income Temporary Equity, Net Income Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Noncontrolling Interest, Decrease from Distributions to Noncontrolling Interest Holders Partners' Capital Account, Distributions Partners' Capital Account, Distributions Text Block [Abstract] Long-Term Debt Long-term Debt [Text Block] Partners' Capital Partners' Capital Notes Disclosure [Text Block] Segments Segment Reporting Disclosure [Text Block] Earnings from unconsolidated affiliates, net Difference between carrying amount and underlying equity Equity Method Investment, Difference Between Carrying Amount and Underlying Equity Business Acquisition, Percentage of Voting Interests Acquired Business Acquisition, Percentage of Voting Interests Acquired Reconciliation of Net Income (Loss) to Earnings Before Interest, Taxes, Depreciation and Amortization Reconciliation of Net Income (Loss) to Earnings Before Interest, Taxes, Depreciation and Amortization [Table Text Block] Reconciliation of Net Income (Loss) to Earnings Before Interest, Taxes, Depreciation and Amortization [Table Text Block] Summary Of Segment Information Schedule of Segment Reporting Information, by Segment [Table Text Block] Investments in Unconsolidated Affiliates Equity Method Investments and Joint Ventures Disclosure [Text Block] Corporate Corporate Segment [Member] Segment Reporting Information, Additional Information [Abstract] Segment Reporting Information, Additional Information [Abstract] Operating revenues Intersegment Revenues Intersegment Revenues Intersegment Revenues General and administrative Gain (loss) on long-lived assets Goodwill impairment Other income, net Other Income EBITDA Total assets Other Commitments [Table] Other Commitments [Table] Other Commitments [Line Items] Other Commitments [Line Items] Proceeds from equity method investments Proceeds from Equity Method Investment, Distribution Payments to acquire equity method investments Payments to Acquire Equity Method Investments Cash and Noncash Consideration Payments to Acquire Equity Method Investments Cash and Noncash Consideration Payments to Acquire Equity Method Investments Cash and Noncash Consideration Distributions Made to Limited Partner [Table] Distributions Made to Limited Partner [Table] Distribution Made to Limited Partner [Line Items] Distribution Made to Limited Partner [Line Items] Distribution Made to Limited Partner, Date of Record Distribution Made to Limited Partner, Date of Record Distribution Made to Limited Partner, Distribution Date Distribution Made to Limited Partner, Distribution Date Distribution Made to Member or Limited Partner, Distributions Paid, Per Unit Distribution Made to Limited Partner, Distributions Paid, Per Unit Distribution Made to Limited Partner, Cash Distributions Paid Distribution Made to Limited Partner, Cash Distributions Paid Schedule of Related Party Transactions, by Related Party [Table] Schedule of Related Party Transactions, by Related Party [Table] Plan Name [Axis] Plan Name [Axis] Plan Name [Domain] Plan Name [Domain] Crestwood LTIP Crestwood Long-Term Incentive Plan [Member] Crestwood Long-Term Incentive Plan [Member] Crestwood Holdings Crestwood Holdings [Member] Crestwood Holdings [Member] Applied Consultants, Inc. Applied Consultants, Inc. [Member] Applied Consultants, Inc. [Member] Ascent Resources - Utica, LLC Ascent Resources - Utica, LLC [Member] Ascent Resources - Utica, LLC [Member] Affiliated Entity Affiliated Entity [Member] Related Party Transaction [Line Items] Related Party Transaction [Line Items] Share-based Payment Arrangement, Expense Share-based Payment Arrangement, Expense Revenues at CEQP and CMLP(1) Revenue from Related Parties Costs of product/services sold at CEQP and CMLP(2) Costs and Expenses, Related Party General and administrative expenses charged by CEQP to CMLP, net(4) Related Party Transaction, Selling, General and Administrative Expenses from Transactions with Related Party Related Party Transaction, (Income) Expenses from Transactions with Related Party Related Party Transaction, (Income) Expenses from Transactions with Related Party Related Party Transaction, (Income) Expenses from Transactions with Related Party General and administrative expenses at CEQP charged to (from) Crestwood Holdings, net(5) Related Party Transaction, Expenses from Transactions with Related Party Related Party Transaction, Due from (to) Related Party [Abstract] Related Party Transaction, Due from (to) Related Party [Abstract] Related party receivables Accounts Receivable, Related Parties, Current Related party payables Accounts Payable, Related Parties, Current Derivatives Not Designated as Hedging Instruments [Table Text Block] Derivatives Not Designated as Hedging Instruments [Table Text Block] Notional Amounts And Terms Of Company's Derivative Financial Instruments Schedule of Notional Amounts of Outstanding Derivative Positions [Table Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block] Common unit Common Unit Capital [Member] Common Unit Capital [Member] Partners' Capital Partners' Capital [Member] Partners' Capital [Member] Increase (Decrease) in Partners' Capital [Roll Forward] Increase (Decrease) in Partners' Capital [Roll Forward] Beginning balance Common Unit, Outstanding Common Unit, Outstanding Distributions to partners Unit-based compensation charges Partners' Capital Account, Unit-based Payment Arrangement, Amount Unit-based compensation charges (in shares) Partners' Capital Account, Unit-based Payment Arrangement, Number of Units Taxes paid for unit-based compensation vesting Share-based Payment Arrangement, Decrease for Tax Withholding Obligation Taxes paid for unit-based compensation vesting (in shares) Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation Other (in shares) Partners' Capital Account, Units Other Partners' Capital, Other Ending Balance Income Statement [Abstract] Gathering and Processing Segment Product Product [Member] Service Service [Member] Revenues: Revenues [Abstract] Related party (Note 11) Costs of product/services sold (exclusive of items shown separately below): Cost of Goods and Services Sold [Abstract] Costs of product/services sold Cost of Goods and Services Sold Product costs - related party (Note 11) Related Parties Amount in Cost of Sales Total costs of product/services sold Other income, net Other Nonoperating Income (Expense) Net Income Attributable to Noncontrolling Interest Net income (loss) attributable to parent Net income attributable to preferred unit holders Net Income (Loss) Attributable to Preferred Unit Holders Net Income (Loss) Attributable to Preferred Unit Holders Net loss attributable to partners Net Income (Loss), Partners Interest in Net Income Net Income (Loss), Partners Interest in Net Income Common unitholders’ interest in net loss Net Income (Loss) Allocated to Limited Partners Net loss per limited partner unit: Basic (in dollars per share) Earnings Per Share, Basic Diluted (in dollars per share) Earnings Per Share, Diluted Weighted-average limited partners’ units outstanding: Net Income (Loss), Per Outstanding Limited Partnership Unit, Diluted, Other Disclosures [Abstract] Basic (units) Weighted Average Limited Partnership Units Outstanding, Basic Dilutive units (units) Weighted Average Number Diluted Limited Partnership Units Outstanding Adjustment Diluted (units) Weighted Average Limited Partnership Units Outstanding, Diluted Components Of Long-Term Debt Schedule of Long-term Debt Instruments [Table Text Block] Equity Method Investments Equity Method Investments [Table Text Block] Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Summary Of Significant Accounting Policies [Table] Reporting Unit [Axis] Reporting Unit [Axis] Reporting Unit [Domain] Reporting Unit [Domain] Arrow Arrow [Member] Arrow [Member] Powder River Basin Powder River Basin [Member] Powder River Basin [Member] NGL Marketing and Logistics NGL Marketing and Logistics [Member] NGL Marketing and Logistics [Member] Adjustments for New Accounting Pronouncements [Axis] Adjustments for New Accounting Pronouncements [Axis] Type of Adoption [Domain] Type of Adoption [Domain] Accounting Standards Update 2016-13 Accounting Standards Update 2016-13 [Member] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Summary Of Significant Accounting Policies [Line Items] Goodwill [Roll Forward] Goodwill [Roll Forward] Goodwill, beginning balance Goodwill, ending balance New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets New Accounting Pronouncement or Change in Accounting Principle, Cumulative Effect of Change on Equity or Net Assets Distribution Type [Axis] Distribution Type [Axis] Distribution Type [Domain] Distribution Type [Domain] Cash Distribution Cash Distribution [Member] Counterparty Name [Axis] Counterparty Name [Axis] Legal Entity Type of Counterparty [Domain] Counterparty Name [Domain] Award Type [Axis] Award Type [Axis] Award Type [Domain] Award Type [Domain] Equity Offering Program Authorized Amount Equity Offering Program Authorized Amount Equity Offering Program Authorized Amount Distribution Made to Limited Partner, Distributions Declared, Per Unit Distribution Made to Limited Partner, Distributions Declared, Per Unit Distributions to preferred unit holders Incentive Distribution, Distribution Payments of Ordinary Dividends, Noncontrolling Interest Distribution Made to General Partner, Cash Distributions Paid Distribution Made to General Partner, Cash Distributions Paid Distribution Made to General Partner, Cash Distributions Paid Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount Share-based Payment Arrangement, Noncash Expense Share-based Payment Arrangement, Noncash Expense Environmental Remediation Obligations [Abstract] Site Contingency [Table] Site Contingency [Table] Environmental Remediation Site [Axis] Environmental Remediation Site [Axis] Environmental Remediation Site [Domain] Environmental Remediation Site [Domain] Fort Berthold Indian Reservation Fort Berthold Indian Reservation [Member] Fort Berthold Indian Reservation [Member] Site Contingency [Line Items] Site Contingency [Line Items] Site Contingency, Loss Exposure, Number of Releases of Produced Water Site Contingency, Loss Exposure, Number of Releases of Produced Water Site Contingency, Loss Exposure, Number of Releases of Produced Water Miles of Water Gathering Pipeline Removed Miles of Water Gathering Pipeline Removed Miles of Water Gathering Pipeline Removed Loss Contingency, Estimate of Possible Loss Loss Contingency, Estimate of Possible Loss Accrual for Environmental Loss Contingencies Accrual for Environmental Loss Contingencies Site Contingency, Loss Exposure in Excess of Accrual, Best Estimate Site Contingency, Loss Exposure in Excess of Accrual, Best Estimate Schedule of Accrued Liabilities Schedule of Accrued Liabilities [Table Text Block] Other Noncurrent Liabilities [Table Text Block] Other Noncurrent Liabilities [Table Text Block] Net income attributable to non-controlling partners in subsidiaries NYMEX Derivative Liability NYMEX Derivative Liability [Member] NYMEX Derivative Liability [Member] NYMEX Margin Deposit NYMEX Margin Deposit [Member] NYMEX Margin Deposit [Member] Commodity contract with credit contingent features Commodity Contract With Credit Contingent Features [Member] Commodity Contract With Credit Contingent Features [Member] Aggregate fair value of commodity derivative instruments Derivative, Net Liability Position, Aggregate Fair Value Derivative Liability NYMEX margin deposits Margin Deposit Assets Collateral posted for commodity derivative instruments Collateral Already Posted, Aggregate Fair Value Commitments and Contingencies Commitments and Contingencies Disclosure [Text Block]