| Document and Entity Information - USD ($) | 12 Months Ended | ||
| Dec. 31, 2019 | Feb. 28, 2020 | Jun. 30, 2019 | |
| Cover page. | |||
| Entity Registrant Name | DCP MIDSTREAM, LP | ||
| Document Period End Date | Dec. 31, 2019 | ||
| Amendment Flag | true | ||
| Amendment Description | Explanatory NoteDCP Midstream, LP, together with its consolidated subsidiaries (the “Partnership”, which may also be referred to as “we,” “us” or “our”) is filing this Amendment No. 1 (the “Amendment No. 1”) to our Annual Report on Form 10-K for the year ended December 31, 2019, which was filed with the Securities and Exchange Commission on February 21, 2020 (the “Original Form 10-K”), for the sole purpose of (i) including the inadvertently omitted footnote 4 and the first two paragraphs of footnote 5 to the notes to each of the respective financial statements of the Company’s unconsolidated affiliates, DCP Sand Hills Pipeline, LLC (“Sand Hills”) and DCP Southern Hills Pipeline, LLC (“Southern Hills”), and (ii) to correct the labeling of the row for Cost of transportation – affiliates and General and administrative expense – affiliates in the Summary of Transactions with Affiliates table included in footnote 6 to the Southern Hills financial statements, which were previously filed in Item 15. “Exhibits, Financial Statement Schedules” to the Original Form 10-K pursuant to Rule 3-09 of Regulation S-X. In accordance with Rule 3-09(b), the unmodified financial statements for Discovery Producer Services, LLC (“Discovery”), as well as the separate audited financial statements of Sand Hills and Southern Hills, are being filed as an amendment to the Form 10-K as Exhibits 99.1, 99.2, and 99.3, respectively, included in Part IV, Item 15 of this filing.This Amendment also supplements Part IV, Item 15 of the Original Form 10-K to include the filing of Exhibit 23.4, the consent of Ernst & Young LLP on the financial statements of Discovery and Exhibit 23.5, the consent of Deloitte & Touche LLP on the financial statements of Sand Hills and Southern Hills. In addition, as required by Rule 12b-15 under the Securities Exchange Act of 1934, as amended, new certifications by the Company’s principal executive officer and principal financial officer are filed herewith as exhibits to this Amendment No. 1 pursuant to Section 302 of the Sarbanes-Oxley Act of 2002 and pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.Except as otherwise expressly noted herein, this Amendment No. 1 does not modify or update in any way the financial position, results of operations, cash flows, or other disclosures in, the Original Form 10-K, nor does it reflect events occurring after the filing of the Original Form 10-K. Accordingly, this Amendment No. 1 should be read in conjunction with the Original Form 10-K. | ||
| Document Fiscal Year Focus | 2019 | ||
| Entity Filer Category | Large Accelerated Filer | ||
| Entity Small Business | false | ||
| Entity Emerging Growth Company | false | ||
| Document Fiscal Period Focus | FY | ||
| Entity Central Index Key | 0001338065 | ||
| Current Fiscal Year End Date | --12-31 | ||
| Document Type | 10-K/A | ||
| City Area Code | (303) | ||
| Document Annual Report | true | ||
| Local Phone Number | 595-3331 | ||
| Entity Address, Postal Zip Code | 80202 | ||
| Entity Address, Address Line One | 370 17th Street | ||
| Entity Address, Address Line Two | Suite 2500 | ||
| Entity Address, City or Town | Denver | ||
| Entity Address, State or Province | CO | ||
| Entity Current Reporting Status | Yes | ||
| Entity Incorporation, State or Country Code | DE | ||
| Entity Tax Identification Number | 03-0567133 | ||
| Document Transition Report | false | ||
| Entity File Number | 001-32678 | ||
| Entity Shell Company | false | ||
| Entity Interactive Data Current | Yes | ||
| Entity Well-known Seasoned Issuer | Yes | ||
| Entity Voluntary Filers | No | ||
| Entity Public Float | $ 2,650,723,000 | ||
| Entity Common Stock, Shares Outstanding | 208,329,928 | ||
| Series B Preferred Limited Partners [Domain] | |||
| Title of 12(b) Security | 7.875% Series B Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units | ||
| Trading Symbol | DCP PRB | ||
| Security Exchange Name | NYSE | ||
| Series C Preferred Limited Partners [Domain] | |||
| Title of 12(b) Security | 7.95% Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units | ||
| Trading Symbol | DCP PRC | ||
| Security Exchange Name | NYSE | ||
| Limited Partner [Member] | |||
| Title of 12(b) Security | Common Units Representing Limited Partner Interests | ||
| Trading Symbol | DCP | ||
| Security Exchange Name | NYSE |
