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Partners' Capital and Distributions - Subsidiary Distributions (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Nov. 14, 2017
Oct. 10, 2017
Aug. 14, 2017
May 15, 2017
Feb. 14, 2017
Sep. 30, 2017
Sep. 30, 2016
Partners Capital and Distributions              
Total distributions paid           $ 1,170 $ 1,291
SLC Pipeline LLC              
Partners Capital and Distributions              
Distributions to noncontrolling interests           $ 2  
PAA | Common Units | Cash Distributions              
Partners Capital and Distributions              
Total distributions paid     $ 399 $ 399 $ 371    
Distributions per common unit, paid     $ 0.55 $ 0.55 $ 0.55    
PAA | Series A Preferred Units | In-Kind Distributions              
Partners Capital and Distributions              
Distributions to limited partners     $ 35 $ 34 $ 34    
Distribution of units in lieu of cash (units)     1,339,796 1,313,527 1,287,773    
AAP              
Partners Capital and Distributions              
Distributions to noncontrolling interests     $ 75 $ 75 $ 77    
Distributions to PAGP     84 84 57    
Total distributions paid     159 159 134    
Forecast | PAA | Common Units | Cash Distributions              
Partners Capital and Distributions              
Annualized distributions per common unit (usd per unit) $ 1.20            
Total distributions paid $ 218            
Distributions per common unit, paid $ 0.30            
Forecast | PAA | Series A Preferred Units | In-Kind Distributions              
Partners Capital and Distributions              
Distributions to limited partners $ 36            
Distribution of units in lieu of cash (units) 1,366,593            
Forecast | AAP              
Partners Capital and Distributions              
Distributions to noncontrolling interests $ 40            
Distributions to PAGP 46            
Total distributions paid 86            
Public | PAA | Common Units | Cash Distributions              
Partners Capital and Distributions              
Distributions to limited partners     240 240 237    
Public | Forecast | PAA | Common Units | Cash Distributions              
Partners Capital and Distributions              
Distributions to limited partners 132            
AAP | PAA | Common Units | Cash Distributions              
Partners Capital and Distributions              
Distributions to limited partners     $ 159 $ 159 $ 134    
AAP | Forecast | PAA | Common Units | Cash Distributions              
Partners Capital and Distributions              
Distributions to limited partners $ 86            
Subsequent event | PAA | Common Units | Cash Distributions              
Partners Capital and Distributions              
Annualized distributions declared per common unit (usd per unit)   $ 1.20