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Related Party Transactions (Tables) | 6 Months Ended
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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 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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