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Related Party Transactions (Tables)
 6 Months Ended
Jun. 30, 2018
Oxy  
Related Party Transaction [Line Items]  
Schedule of related party transactions
The impact to our Condensed Consolidated Statements of Operations from those transactions is included below (in millions):
 
Three Months Ended
June 30,
 
Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
Revenues
$
280

 
$
220

 
$
558

 
$
453

 
 
 
 
 
 
 
 
Purchases and related costs (1)
$
(91
)
 
$
(61
)
 
$
(162
)
 
$
(101
)
 
(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 Condensed 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):
 
June 30,
2018
 
December 31,
2017
Trade accounts receivable and other receivables
$
1,115

 
$
1,075

 
 
 
 
Accounts payable
$
1,012

 
$
990