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Net Income/(Loss) Per Common Unit (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Basic Net Income/(Loss) per Common Unit
Net income attributable to PAA	$ 710	$ 33	$ 1,099	$ 665
Distributions to participating securities	(1)	(1)	(2)	(2)
Other	(2)	(4)	(2)	(11)
Net income/(loss) allocated to common unitholders	658	(8)	946	547
Diluted Net Income/(Loss) per Common Unit
Net income attributable to PAA	710	33	1,099	665
Distributions to participating securities	(1)	(1)	(2)	(2)
Other		(4)	(1)	(11)
Net income/(loss) allocated to common unitholders	697	(8)	947	547
Series A Preferred Units
Basic Net Income/(Loss) per Common Unit
Distributions to preferred unitholders	(37)	(36)	(112)	(105)
Diluted Net Income/(Loss) per Common Unit
Distributions to preferred unitholders		$ (36)	(112)	$ (105)
Series B Preferred Units
Basic Net Income/(Loss) per Common Unit
Distributions to preferred unitholders	(12)		(37)
Diluted Net Income/(Loss) per Common Unit
Distributions to preferred unitholders	$ (12)		$ (37)
Common Units
Basic Net Income/(Loss) per Common Unit
Basic weighted average common units outstanding (units)	726	725	726	714
Basic net income/(loss) per common unit (usd per unit)	$ 0.91	$ (0.01)	$ 1.30	$ 0.77
Diluted Net Income/(Loss) per Common Unit
Basic weighted average common units outstanding (units)	726	725	726	714
Effect of dilutive securities:
Series A preferred units (units)	71
Equity-indexed compensation plan awards (units)	2		2	1
Diluted weighted average common units outstanding (units)	799	725	728	715
Diluted net income/(loss) per common unit (usd per unit)	$ 0.87	$ (0.01)	$ 1.30	$ 0.76

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