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Related Party Transactions (Tables)
 12 Months Ended
Dec. 31, 2017
Oxy  
Related Party Transactions  
Schedule of related party transactions
The impact to our Consolidated Statements of Operations from those transactions is included below (in millions):

 
Year Ended December 31,
 
2017
 
2016
 
2015
Revenues
$
920

 
$
655

 
$
866

 
 
 
 
 
 
Purchases and related costs (1)
$
(253
)
 
$
42

 
$
41

 
(1) 
Crude oil purchases that are part of inventory exchanges under buy/sell transactions are netted with the related sales, with any margin presented in “Purchases and related costs” in our Consolidated Statements of Operations.

We currently have a netting arrangement with Oxy. Our gross receivable and payable amounts with Oxy were as follows (in millions):

 
December 31,
 
2017
 
2016
Trade accounts receivable and other receivables
$
1,075

 
$
789

 
 
 
 
Accounts payable
$
990

 
$
836