| Document and Entity Information - USD ($) | 12 Months Ended | ||
| Dec. 31, 2019 | Mar. 20, 2020 | Jun. 30, 2019 | |
| Cover [Abstract] | |||
| Entity Registrant Name | DCP MIDSTREAM, LP | ||
| Document Period End Date | Dec. 31, 2019 | ||
| Amendment Flag | true | ||
| Amendment Description | EXPLANATORY NOTEDCP Midstream, LP (the “Partnership”) is filing this Amendment No. 2 on Form 10-K/A (this “Amendment No. 2”) to further amend the 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”), as amended by that certain Amendment No. 1 on Form 10-K/A, which was filed with the Securities and Exchange Commission on March 6, 2020 (“Amendment No. 1” and, together with the Original Form 10-K, the “Annual Report”), to amend Part IV, Item 15 of the Annual Report in order to file herewith (A) the audited financial statements in accordance with Rule 3-09 of Regulation S-X for Front Range Pipeline LLC as Exhibit 99.4 and Gulf Coast Express LLC as Exhibit 99.5, and (B) the consent of Deloitte & Touche LLP relating to the financial statements of Front Range Pipeline LLC as Exhibit 23.4 and the consent of BDO USA, LLP relating to the financial statements of Gulf Coast Express LLC as Exhibit 23.5. In addition, as required by Rule 12b-15 of the Securities Exchange Act of 1934, as amended, certifications of the principal executive officer and principal financial officer of DCP Midstream GP, LLC, which is the general partner of DCP Midstream GP, LP, which is the general partner of the Partnership, are filed as exhibits hereto 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. 2 does not modify or update the disclosures in the Annual Report, nor does it reflect events occurring after the filing of the Original Form 10-K or Amendment No. 1. Accordingly, this Amendment No. 2 should be read in conjunction with the Annual Report. | ||
| 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 |
