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Related-Party Transactions (Tables)
12 Months Ended
Dec. 31, 2017
Related Party Transactions [Abstract]  
Schedule of Related Party Transactions
Related party transactions with affiliates for the years ended December 31, 2017, 2016, and 2015 were as follows (in millions): 
 
Year Ended December 31, 2017
 
Year Ended December 31, 2016
 
Year Ended December 31, 2015
Motor fuel sales to affiliates
$
55

 
$
62

 
$
20

Bulk fuel purchases from affiliates
$
2,416

 
$
1,867

 
$
2,449