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Partners' Capital and Distributions - Issuance of Series B Preferred Units (Details) - USD ($)
$ / shares in Units, $ in Millions
9 Months Ended
Nov. 15, 2017
Oct. 10, 2017
Sep. 30, 2017
Nov. 15, 2022
Subsidiary, Sale of Stock [Line Items]        
Proceeds from issuance of units     $ 1,535  
Subsequent event | PAA | Series B Preferred Units        
Subsidiary, Sale of Stock [Line Items]        
Units issued (in units)   800,000    
Price per unit issued (in dollars per unit)   $ 1,000    
Proceeds from issuance of units   $ 788    
Liquidation preference (in dollars per unit)   $ 1,000    
Distribution rate percentage   6.125%    
Distribution rate per unit   $ 61.25    
Redemption price per unit   $ 1,020    
Redemption price percentage   102.00%    
Forecast | PAA | Series B Preferred Units        
Subsidiary, Sale of Stock [Line Items]        
Percentage spread on top of LIBOR for distribution       4.11%
Initial prorated distribution per unit (in dollars per unit) $ 5.9549      
Total distribution amount $ 5      
Redemption price per unit       $ 1,000