Partnership Equity and Distributions - Additional Information (Detail) $ in Millions	6 Months Ended
Jun. 30, 2020 USD ($) shares
Partnership Equity And Distribution [Line Items]
Common unitholders, units issued (in shares) \| shares	208,329,928
DCP Midstream LP \| DCP Midstream, LLC
Partnership Equity And Distribution [Line Items]
Ownership interest percentage by parent	57.00%
Equity Distribution Agreement [Member]
Partnership Equity And Distribution [Line Items]
Offer Value Of Common Stock Unit Remaining Available For Sale \| $	$ 750

The number of limited partner units issued.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 5
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187171-122770

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70434-108055

Name:	us-gaap_LimitedPartnersCapitalAccountUnitsIssued
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant