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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Related Party Transaction [Line Items]            
Revenues from related parties     $ 205 $ 266 $ 661 $ 832
Purchases and related costs from related parties     (7) $ 157 93 $ 317
Trade accounts receivable and other receivables, net from related parties $ 165 $ 144 165   165  
Trade accounts payable to related parties $ 105 $ 121 $ 105   $ 105  
Class C Shares | PAA            
Related Party Transaction [Line Items]            
Ownership interest (in shares) 546,897,362 516,938,280        
Agreement To Transport Crude Oil On Pipeline Of Equity Method Investee | Equity Method Investee            
Related Party Transaction [Line Items]            
Ownership interest in unconsolidated entity 50.00%   50.00%   50.00%  
Minimum | AAP | Principal Owner            
Related Party Transaction [Line Items]            
Limited partner interest         10.00%