Partners' Capital and Distributions - Noncontrolling Interest in Subsidiaries (Details) $ in Millions	3 Months Ended
Mar. 31, 2020 USD ($)
Noncontrolling Interest [Line Items]
Contributions from noncontrolling interests	$ 8
Noncontrolling Interests
Noncontrolling Interest [Line Items]
Contributions from noncontrolling interests	8
Red River LLC \| Noncontrolling Interests
Noncontrolling Interest [Line Items]
Contributions from noncontrolling interests	$ 8

Total contributions made by each class of partners (i.e., general, limited and preferred partners).

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

Name:	us-gaap_PartnersCapitalAccountContributions
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration