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Net Income Per Common Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Basic Net Income per Common Unit
Net income attributable to PAA	$ 100	$ 188	$ 388	$ 632
Distributions to participating securities	(1)	(1)	(2)	(1)
Other		(4)	(1)	(7)
Net income allocated to common unitholders	50	148	286	555
Diluted Net Income per Common Unit
Net income attributable to PAA	100	188	388	632
Distributions to participating securities	(1)	(1)	(2)	(1)
Other		(4)	(1)	(7)
Net income allocated to common unitholders	$ 50	$ 148	$ 286	$ 555
Effect of dilutive securities:
Equity-indexed compensation plan awards (units)	2	2	2	2
Series A Preferred Units
Basic Net Income per Common Unit
Distributions to preferred unitholders	$ (37)	$ (35)	$ (74)	$ (69)
Diluted Net Income per Common Unit
Distributions to preferred unitholders	(37)	$ (35)	(74)	$ (69)
Series B Preferred Units
Basic Net Income per Common Unit
Distributions to preferred unitholders	(12)		(25)
Diluted Net Income per Common Unit
Distributions to preferred unitholders	$ (12)		$ (25)
Common Units
Basic Net Income per Common Unit
Basic weighted average common units outstanding (units)	725	725	725	708
Basic net income per common unit (usd per unit)	$ 0.07	$ 0.21	$ 0.39	$ 0.78
Diluted Net Income per Common Unit
Basic weighted average common units outstanding (units)	725	725	725	708
Effect of dilutive securities:
Diluted weighted average common units outstanding (units)	727	727	727	710
Diluted net income per common unit (usd per unit)	$ 0.07	$ 0.21	$ 0.39	$ 0.78

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