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Related Party Transactions (Tables)
9 Months Ended
Sep. 30, 2018
Related Party Transactions [Abstract]  
Sales to Related Parties
Significant transactions with related parties were as follows:
 
Three Months Ended 
 September 30,
 
Nine Months Ended 
 September 30,
(In millions)
2018
 
2017
 
2018
 
2017
Sales to related parties(a)
$
201

 
$
157

 
$
572

 
$
458

Purchases from related parties(b)
149

 
148

 
428

 
420


(a)  
Sales to related parties consists primarily of sales of refined products to PFJ Southeast, an equity affiliate which owns and operates travel plazas primarily in the Southeast region of the United States.
(b)  
We obtain transportation services and purchase ethanol from certain of our equity affiliates, none of which is individually material.