Represents the costs incurred for commissions paid to the agent under the equity distribution agreement.

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- Definition

Partners' Capital Account, Units, Issuance Of Units

+ References

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- Definition

Total change in each class of partners' capital accounts during the year due to the sale of units. All partners include 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
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- Definition

Total units issued during the year due to the sale of units. All partners include general, limited and preferred partners.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
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- Definition

The cash inflow from an entity that is affiliated with the entity by means of direct or indirect ownership.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585

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Partners' Capital and Distributions - Equity Offerings (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Partners Capital and Distribution [Line Items]
Issuance of units, net proceeds			$ 1,664	$ 805
General partners' proportionate capital contributions			0	42
Continuous and Underwritten Offerings \| General Partner
Partners Capital and Distribution [Line Items]
General partners' proportionate capital contributions				9
Continuous Offering Program
Partners Capital and Distribution [Line Items]
Commissions to sales agents			$ 1	$ 8
Common Units
Partners Capital and Distribution [Line Items]
Issuance of units (in units)			54,119,893
Issuance of units, net proceeds			$ 1,664
Common Units \| Continuous Offering Program
Partners Capital and Distribution [Line Items]
Issuance of units (in units)			4,033,567	26,278,288
Issuance of units, net proceeds			$ 129	$ 805
Common Units \| Omnibus Agreement
Partners Capital and Distribution [Line Items]
Issuance of units (in units)			50,086,326
Issuance of units, net proceeds			$ 1,535
Omnibus Agreement \| Common Units \| Continuous Offering Program \| AAP
Partners Capital and Distribution [Line Items]
Issuance of units (in units)			1,800,000
Omnibus Agreement \| Common Units \| Underwritten Offering \| AAP
Partners Capital and Distribution [Line Items]
Issuance of units (in units)	48,300,000
AAP \| Omnibus Agreement \| Common Units
Partners Capital and Distribution [Line Items]
Issuance of common units (in units)		559,649
AAP \| Omnibus Agreement \| Common Units \| Continuous Offering Program
Partners Capital and Distribution [Line Items]
Issuance of units (in units)			1,800,000
AAP \| Omnibus Agreement \| Common Units \| Underwritten Offering
Partners Capital and Distribution [Line Items]
Issuance of units (in units)			48,300,000