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Organization and Basis of Consolidation and Presentation (Details) shares in Millions, $ in Millions		12 Months Ended	22 Months Ended
	Nov. 15, 2016 USD ($) shares	Dec. 31, 2017 segment shares	Nov. 14, 2016
Organization and basis of presentation
Operating segments number | segment		3
Limited partner interest			98.00%
AAP
Organization and basis of presentation
Limited partner interest (units)		284.0
Limited partner interest		36.00%
AAP | PAGP
Organization and basis of presentation
Limited partner interest		55.00%
Simplification Transactions | PAA GP
Organization and basis of presentation
Economic ownership interest converted into non-economic interest	2.00%
AAP senior secured credit agreement | Simplification Transactions | AAP
Organization and basis of presentation
Debt assumed | $	$ 642
Common Units | Simplification Transactions | AAP
Organization and basis of presentation
Units to be issued in the future (in units)	0.8
Common Units | Simplification Transactions | AAP
Organization and basis of presentation
Units agreed to be issued in connection with the Simplification Transactions	245.5
Units to be issued in the future (in units)	0.8

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Percentage of economic interest held by the managing member or general partner of the limited liability company (LLC) or limited partnership (LP), converted into a non-economic interest.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Percentage investment held by members or limited partners of limited liability company (LLC) or limited partnership (LP).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 272
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6373374&loc=d3e70478-108055

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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