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INVESTMENTS AND RELATED-PARTY TRANSACTIONS (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($) interest | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Equity Method Investments |  |  |
Equity method investment amounts | $ 1,680 | $ 1,515 | $ 1,401
Equity investments dividends paid | 329 | 297 | 224
Excess of investments in equity investees over the underlying equity in net assets | 636 |  |
Excess of investments in equity investees over the underlying equity in net assets, which represents goodwill | 464 |  |
Equity-method investments financial information summarized by Income Statement line item |  |  |
Revenues and other income | 1,932 | 1,252 | 1,238
Costs and expenses | 1,527 | 973 | 1,043
Net income | 405 | 279 | 195
Equity-method investments financial information summarized by Balance Sheet line item |  |  |
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 |
RELATED-PARTY TRANSACTIONS |  |  |
Sales | 805 | 636 | 602
Purchases | 502 | 387 | 7
Services | 52 | 38 | 17
Advances and amounts due from | 63 | 63 | 59
Amounts due to | $ 46 | $ 45 | $ 0
General Partner of Plains All American Pipeline, L.P |  |  |
Equity Method Investments |  |  |
Ownership interest (as a percent) | 11.00% |  |
RELATED-PARTY TRANSACTIONS |  |  |
Sales to related party (as a percent) | 89.00% | 86.00% | 89.00%
Plains All American Pipeline, LP |  |  |
Equity Method Investments |  |  |
Ownership interest (as a percent) | 40.00% |  |
Dolphin Energy |  |  |
Equity Method Investments |  |  |
Ownership interest (as a percent) | 24.50% |  |
Number of separate economic interests comprising investment in unconsolidated affiliate | interest | 2 |  |
Equity method investment ownership percentage | 24.50% |  |
OxyChem Ingleside facility |  |  |
Equity Method Investments |  |  |
Ownership interest (as a percent) | 50.00% |  |
Ingleside ethylene |  |  |
RELATED-PARTY TRANSACTIONS |  |  |
Purchases from related party (as a percent) | 98.00% |  |

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