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Related Party Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Related Party Transaction [Line Items]            
Revenues from related parties     $ 7 $ 205 $ 40 $ 661
Purchases and related costs from related parties     116 $ (7) 339 $ 93
Trade accounts receivable and other receivables, net from related parties $ 83 $ 134 83   83  
Trade accounts payable to related parties $ 82 $ 102 $ 82   $ 82  
Class C Shares | PAA            
Related Party Transaction [Line Items]            
Ownership interest (in shares) 553,800,444 549,538,139        
Agreement To Transport Crude Oil On Pipelines Or At Facilities 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%