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Partners' Capital and Distributions - Equity Offerings (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Partners Capital and Distribution [Line Items]
Issuance of units, net proceeds			$ 1,664
Continuous Offering Program
Partners Capital and Distribution [Line Items]
Commissions to sales agents			$ 1
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
Issuance of units, net proceeds			$ 129
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
AAP | Omnibus Agreement | Common Units
Partners Capital and Distribution [Line Items]
Issuance of common units (in units)	232,425	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

X

- Definition

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

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Partners' Capital Account, Units, Issuance Of Units

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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
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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-Name Accounting Standards Codification
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-Paragraph 5
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Total units issued 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 272
-SubTopic 10
-Section 50
-Paragraph 3
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