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Partners' Capital and Distributions - Subsidiary Sales of Common Units (Details) - USD ($) shares in Millions, $ in Millions	1 Months Ended	6 Months Ended
	Mar. 31, 2017	Jun. 30, 2017
Partners Capital and Distributions
Sale of common units, net proceeds		$ 1,535
PAA
Partners Capital and Distributions
Noncontrolling interests in subsidiaries (percent)		64.00%
AAP
Partners Capital and Distributions
Noncontrolling interests in subsidiaries (percent)		47.00%
SLC Pipeline LLC
Partners Capital and Distributions
Noncontrolling interests in subsidiaries (percent)		25.00%
PAA | Continuous Offering Program | Common Units
Partners Capital and Distributions
Sale of common units (units)		4.0
Sale of common units, net proceeds		$ 129
Commissions paid to sales agents		$ 1
Omnibus Agreement | PAA | Continuous Offering Program | Common Units
Partners Capital and Distributions
Sale of common units (units)		1.8
Omnibus Agreement | PAA | Underwritten Offering | Common Units
Partners Capital and Distributions
Sale of common units (units)	48.3

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
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Total units issued during the year due to the sale of units. All partners include general, limited and preferred partners.

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The cash outflow for cost incurred directly with the issuance of an equity security.

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