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Organization and Basis of Consolidation and Presentation (Details)
shares in Millions, $ in Millions
12 Months Ended 22 Months Ended
Nov. 15, 2016
USD ($)
shares
Dec. 31, 2018
segment
shares
Dec. 31, 2017
USD ($)
Nov. 14, 2016
Organization and basis of presentation        
Operating segments number | segment   3    
Limited partner interest       98.00%
AAP        
Organization and basis of presentation        
Limited partner interest (units) | shares   280.5    
Limited partner interest   35.00%    
Simplification Transactions | PAA GP        
Organization and basis of presentation        
Economic ownership interest converted into non-economic interest 2.00%      
AAP senior secured credit agreement | Simplification Transactions | AAP        
Organization and basis of presentation        
Debt assumed | $ $ 642      
Common Units | Simplification Transactions | AAP        
Organization and basis of presentation        
Units agreed to be issued in connection with the Simplification Transactions | shares 245.5      
Units to be issued in the future (in units) | shares 0.8      
AAP | PAGP        
Organization and basis of presentation        
Limited partner interest   57.00%    
Accounts payable and accrued liabilities        
Organization and basis of presentation        
Increase (decrease) other current liabilities | $     $ (134)  
Other current liabilities        
Organization and basis of presentation        
Increase (decrease) other current liabilities | $     $ 134