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Partners' Capital and Distributions - Subsidiary Distributions (Details) - USD ($) $ / shares in Units, $ in Millions				6 Months Ended
	Aug. 14, 2017	May 15, 2017	Feb. 14, 2017	Jun. 30, 2017	Jun. 30, 2016
Partners Capital and Distributions
Total distributions paid				$ 771	$ 860
AAP
Partners Capital and Distributions
Distributions to noncontrolling interests		$ 75	$ 77
Distributions to PAGP		84	57
Total distributions paid		159	134
SLC Pipeline LLC
Partners Capital and Distributions
Distributions to noncontrolling interests				$ 1
Class A Shares
Partners Capital and Distributions
Distributions to limited partners		$ 84	$ 57
Distributions per common unit, paid		$ 0.55	$ 0.55
PAA | Common Units | Cash Distributions
Partners Capital and Distributions
Total distributions paid		$ 399	$ 371
Distributions per common unit, paid		$ 0.55	$ 0.55
PAA | Series A Preferred Units | In-Kind Distributions
Partners Capital and Distributions
Distributions to limited partners		$ 34	$ 34
Distribution of units in lieu of cash (units)		1,313,527	1,287,773
Forecast | AAP
Partners Capital and Distributions
Distributions to noncontrolling interests	$ 75
Distributions to PAGP	84
Total distributions paid	159
Forecast | Class A Shares
Partners Capital and Distributions
Distributions to limited partners	$ 84
Distributions per common unit, paid	$ 0.55
Forecast | PAA | Common Units | Cash Distributions
Partners Capital and Distributions
Total distributions paid	$ 399
Distributions per common unit, paid	$ 0.55
Forecast | PAA | Series A Preferred Units | In-Kind Distributions
Partners Capital and Distributions
Distributions to limited partners	$ 35
Distribution of units in lieu of cash (units)	1,339,796
Public | PAA | Common Units | Cash Distributions
Partners Capital and Distributions
Distributions to limited partners		$ 240	$ 237
Public | Forecast | PAA | Common Units | Cash Distributions
Partners Capital and Distributions
Distributions to limited partners	$ 240
AAP | PAA | Common Units | Cash Distributions
Partners Capital and Distributions
Distributions to limited partners		$ 159	$ 134
AAP | Forecast | PAA | Common Units | Cash Distributions
Partners Capital and Distributions
Distributions to limited partners	$ 159

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