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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Entity Information [Line Items] |  |  |  |  |  |
Common Stock, Shares, Issued | 445,016,234 |  |  | 445,016,234 |  | 423,166,234
Business Acquisition, Description of Acquired Entity |  |  | On June 30, 2017, we completed the acquisition of all of the outstanding common units of ONEOK Partners that we did not already own at a fixed exchange ratio of 0.985 of a share of our common stock for each ONEOK Partners common unit. We issued 168.9 million shares of our common stock to third-party common unitholders of ONEOK Partners in exchange for all of the 171.5 million outstanding common units of ONEOK Partners that we previously did not own. As a result of the completion of the Merger Transaction, common units of ONEOK Partners are no longer publicly traded. |  |  |
General partnership ownership interest |  |  | 41.20% | 100.00% |  | 100.00%
Impairment of long-lived assets | $ 0 | $ 15,970 |  | $ 0 | $ 15,970 |
Equity Method Investment, Other than Temporary Impairment | $ 0 | $ 4,270 |  | $ 0 | $ 4,270 |

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