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Simplification Transactions - Pro Forma (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015	Dec. 31, 2014
Pro forma results of operations
Net income attributable to PAA	$ 297	$ 249	$ 599	$ 657
LONG-TERM LIABILITIES
Other long-term debt, net of unamortized debt issuance costs	504		504		$ 677
PARTNERS’ CAPITAL
General partner	268		268		301
Total partners’ capital	$ 9,074	$ 8,216	$ 9,074	$ 8,216	7,939	$ 8,191
Common Units
Pro forma results of operations
Basic net income per common unit (usd per unit)	$ 0.40	$ 0.25	$ 0.27	$ 0.54
Diluted net income per common unit (usd per unit)	$ 0.40	$ 0.24	$ 0.27	$ 0.53
PARTNERS’ CAPITAL
Unitholders	$ 7,240		$ 7,240		$ 7,580
Simplification Agreement | Pro Forma Results
Pro forma results of operations
Net income attributable to PAA	294		589
LONG-TERM LIABILITIES
Other long-term debt, net of unamortized debt issuance costs	1,114		1,114
PARTNERS’ CAPITAL
Total partners’ capital	$ 8,464		$ 8,464
Simplification Agreement | Pro Forma Results | Common Units
Pro forma results of operations
Basic net income per common unit (usd per unit)	$ 0.40		$ 0.77
Diluted net income per common unit (usd per unit)	$ 0.40		$ 0.77
PARTNERS’ CAPITAL
Unitholders	$ 6,898		$ 6,898

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