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Partners' Capital and Distributions - Noncontrolling Interest in Subsidiaries (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Noncontrolling Interest [Line Items]
Contributions from noncontrolling interests	$ 1		$ 11	$ 0
Distributions from noncontrolling interests	182	$ 315	679	894
Noncontrolling Interests
Noncontrolling Interest [Line Items]
Contributions from noncontrolling interests	1		11
Distributions from noncontrolling interests	$ 2	$ 4	6	$ 4
Red River LLC | Noncontrolling Interests
Noncontrolling Interest [Line Items]
Contributions from noncontrolling interests			11
Distributions from noncontrolling interests			$ 6

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Proceeds from Contributions from Noncontrolling Interests

+ References

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- Definition

Total distributions to each class of partners (i.e., general, limited and preferred partners).

+ References

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=120397183&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 5
-Subparagraph (SAB Topic 4.F)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187171-122770

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