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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, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Basic Net Income per Common Unit
Net income attributable to PAA	$ 446	$ 100	$ 1,416	$ 388
Distributions to participating securities	(1)	(1)	(2)	(2)
Other	(1)		(4)	(1)
Net income allocated to common unitholders	395	50	1,311	286
Diluted Net Income per Common Unit
Net income attributable to PAA	446	100	1,416	388
Distributions to participating securities	(1)	(1)	(2)	(2)
Other				(1)
Net income allocated to common unitholders	433	50	1,389	286
Series A Preferred Units
Basic Net Income per Common Unit
Distributions to preferred unitholders	(37)	(37)	(74)	(74)
Diluted Net Income per Common Unit
Distributions to preferred unitholders		(37)		(74)
Series B Preferred Units
Basic Net Income per Common Unit
Distributions to preferred unitholders	(12)	(12)	(25)	(25)
Diluted Net Income per Common Unit
Distributions to preferred unitholders	$ (12)	$ (12)	$ (25)	$ (25)
Common Units
Basic Net Income per Common Unit
Basic weighted average common units outstanding (units)	727	725	727	725
Basic net income per common unit (usd per unit)	$ 0.54	$ 0.07	$ 1.80	$ 0.39
Diluted Net Income per Common Unit
Basic weighted average common units outstanding (units)	727	725	727	725
Effect of dilutive securities:
Series A preferred units (units)	71		71
Equity-indexed compensation plan awards (units)	2	2	2	2
Diluted weighted average common units outstanding (units)	800	727	800	727
Diluted net income per common unit (usd per unit)	$ 0.54	$ 0.07	$ 1.74	$ 0.39

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