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Simplification Transactions - Pro Forma (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Dec. 31, 2014
Pro forma results of operations            
Net income attributable to PAA $ 101 $ 124 $ 302 $ 407    
LONG-TERM LIABILITIES            
Other long-term debt, net of unamortized debt issuance costs 358   358   $ 677  
PARTNERS' CAPITAL            
General partner 318   318   301  
Total partners' capital $ 8,970 $ 8,705 $ 8,970 $ 8,705 7,939 $ 8,191
Common Units            
Pro forma results of operations            
Basic net income per common unit (in dollars per unit) $ (0.20) $ (0.06) $ (0.13) $ 0.29    
Diluted net income per common unit (in dollars per unit) $ (0.20) $ (0.06) $ (0.13) $ 0.29    
PARTNERS' CAPITAL            
Unitholders $ 7,085   $ 7,085   $ 7,580  
Simplification Agreement | Pro Forma Results            
Pro forma results of operations            
Net income attributable to PAA 98   296      
LONG-TERM LIABILITIES            
Other long-term debt, net of unamortized debt issuance costs 962   962      
PARTNERS' CAPITAL            
Total partners' capital $ 8,366   $ 8,366      
Simplification Agreement | Pro Forma Results | Common Units            
Pro forma results of operations            
Basic net income per common unit (in dollars per unit) $ 0.10   $ 0.37      
Diluted net income per common unit (in dollars per unit) $ 0.10   $ 0.37      
PARTNERS' CAPITAL            
Unitholders $ 6,799   $ 6,799