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Related Party Transactions (Tables)
 9 Months Ended
Sep. 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
September 30,
 
Nine Months Ended
September 30,
 
2018
 
2017
 
2018
 
2017
Revenues
$
260

 
$
204

 
$
818

 
$
657

 
 
 
 
 
 
 
 
Purchases and related costs (1)
$
(22
)
 
$
(68
)
 
$
(184
)
 
$
(169
)
 
(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):
 
September 30,
2018
 
December 31,
2017
Trade accounts receivable and other receivables
$
1,039

 
$
1,075

 
 
 
 
Accounts payable
$
976

 
$
990