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INVESTMENTS AND RELATED-PARTY TRANSACTIONS (Tables) | 12 Months Ended
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Dec. 31, 2018
INVESTMENTS AND RELATED-PARTY TRANSACTIONS |
Summarized financial information of equity-method investments | The following table presents Occidental’s interest in the summarized financial information of its equity-method investments:
For the years ended December 31, (in millions) |  | 2018 |  | 2017 |  | 2016
Revenues and other income |  | $ | 1,932 |  |  | $ | 1,252 |  |  | $ | 1,238 |
Costs and expenses |  | 1,527 |  |  | 973 |  |  | 1,043 |
Net income |  | $ | 405 |  |  | $ | 279 |  |  | $ | 195 |
As of December 31, (in millions) |  | 2018 |  | 2017 |  |
Current assets |  | $ | 547 |  |  | $ | 602 |  |  |
Non-current assets |  | $ | 2,139 |  |  | $ | 2,072 |  |  |
Current liabilities |  | $ | 237 |  |  | $ | 247 |  |  |
Long-term debt |  | $ | 1,042 |  |  | $ | 1,174 |  |  |
Other non-current liabilities |  | $ | 22 |  |  | $ | 66 |  |  |
Stockholders’ equity |  | $ | 1,385 |  |  | $ | 1,187 |  |  |
Summary of related-party transactions | During 2018, 2017 and 2016, Occidental entered into the following related-party transactions and had the following amounts due from or to its related parties:
For the years ended December 31, (in millions) |  | 2018 |  | 2017 |  | 2016
Sales (a) |  | $ | 805 |  |  | $ | 636 |  |  | $ | 602 |
Purchases (b) |  | $ | 502 |  |  | $ | 387 |  |  | $ | 7 |
Services |  | $ | 52 |  |  | $ | 38 |  |  | $ | 17 |
Advances and amounts due from |  | $ | 63 |  |  | $ | 63 |  |  | $ | 59 |
Amounts due to |  | $ | 46 |  |  | $ | 45 |  |  | $ | — |
(a) | In 2018, 2017 and 2016, sales of Occidental-produced oil and NGL to Plains Pipeline affiliates accounted for 89 percent, 86 percent and 89 percent of these totals, respectively. Sales to Plains Pipeline affiliates related to Occidental's oil and gas production are disclosed above. In addition to these sales, Occidental conducts marketing activities with Plains Pipeline affiliates for oil, NGL and transportation. Net margins associated with these marketing activities are negligible.
(b) | In 2018, purchases of ethylene from the Ingleside ethylene cracker accounted for 98 percent of related-party purchases.

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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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