| Document and Entity Information | Nov. 02, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 2, 2021 |
| Entity Registrant Name | DCP MIDSTREAM, LP |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-32678 |
| Entity Tax Identification Number | 03-0567133 |
| 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 Address, Postal Zip Code | 80202 |
| City Area Code | (303) |
| Local Phone Number | 595-3331 |
| Entity Central Index Key | 0001338065 |
| Amendment Flag | false |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Series B Preferred Limited Partners [Member] | |
| Trading Symbol | DCP PRB |
| Title of 12(b) Security | 7.875% Series B Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units |
| Security Exchange Name | NYSE |
| Series C Preferred Limited Partners [Member] | |
| Trading Symbol | DCP PRC |
| Title of 12(b) Security | 7.95% Series C Fixed-to-Floating Rate Cumulative Redeemable Perpetual Preferred Units |
| Security Exchange Name | NYSE |
| Limited Partner [Member] | |
| Trading Symbol | DCP |
| Title of 12(b) Security | Common units representing limited partnership interests |
| Security Exchange Name | NYSE |
