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INVESTMENTS AND RELATED-PARTY TRANSACTIONS (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 USD ($) item | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Equity Method Investments |  |  |
Equity method investment amounts | $ 1,515 | $ 1,401 | $ 1,267
Equity investments dividends paid | 297 | 224 | 438
Excess of investments in equity investees over the underlying equity in net assets | 649 |  |
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 | 1,252 | 1,238 | 1,050
Costs and expenses | 973 | 1,043 | 827
Net income | 279 | 195 | 223
Equity-method investments financial information summarized by Balance Sheet line item |  |  |
Current assets | 602 | 914 |
Non-current assets | 2,072 | 3,605 |
Current liabilities | 247 | 577 |
Long-term debt | 1,174 | 1,957 |
Other non-current liabilities | 66 | 159 |
Stockholders' equity | 1,187 | 1,826 |
RELATED-PARTY TRANSACTIONS |  |  |
Sales | 636 | 602 | 555
Purchases | 387 | 7 | 26
Services | 38 | 17 | 32
Advances and amounts due from | 63 | $ 59 | 60
Amounts due to | $ 45 |  | $ 5
General Partner of Plains All American Pipeline, L.P |  |  |
RELATED-PARTY TRANSACTIONS |  |  |
Sales to related party (as a percent) | 86.00% | 89.00% | 87.00%
Ingleside ethylene |  |  |
RELATED-PARTY TRANSACTIONS |  |  |
Purchases from related party (as a percent) | 98.00% |  |
OxyChem Ingleside facility |  |  |
EQUITY INVESTMENTS |  |  |
Ownership interest (as a percent) | 50.00% |  |
Dolphin Energy |  |  |
EQUITY INVESTMENTS |  |  |
Equity method investment ownership percentage | 24.50% |  |
Ownership interest (as a percent) | 24.50% |  |
Number of separate economic interests comprising investment in unconsolidated affiliate | item | 2 |  |

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