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Related-Party Transactions (Schedule of Related Party Transactions) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Related Party Transaction [Line Items]      
Motor fuel sales to affiliates $ 55 $ 62 $ 20
Bulk fuel purchases from ETP 2,416 1,867 $ 2,449
Receivables from affiliates 155 3  
Accounts payable to affiliates $ 206 $ 109