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EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  |  | 20.00%
Business Combination, Consideration Transferred |  | $ 195,000 |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 21,900,000 |  |  |  |  |
Share Price |  |  |  | $ 54.50 |  |  |  |  |
Proceeds from Sale of Common Stock |  |  |  | $ 1,200,000 |  |  |  |  |
Common Stock, Dividends, Per Share, Cash Paid |  | $ 0.825 | $ 0.795 | $ 0.77 |  |  | $ 2.390 | $ 1.975 |
Common Stock, Dividends, Per Share, Declared |  | $ 0.825 |  |  | $ 0.745 |  | $ 2.390 | $ 1.975 |
Dividends, Preferred Stock, Cash |  | $ 300 | $ 300 | $ 300 |  |  |  |  |
Preferred Stock, Dividends, Declared |  |  |  |  |  |  | $ 825 | $ 493 |
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. |  |  |
Partnership Capital Distributions [Line Items] |  |  |  |  |  |  |  |  |
General partnership ownership interest |  |  |  |  |  | 41.20% | 100.00% |  | 100.00%
Issued Under Equity Agreement [Member] |  |  |  |  |  |  |  |  |
Proceeds from Sale of Common Stock |  |  |  |  |  |  |  |  | $ 448,300
Common Stock Sold Under Equity Distribution Agreement |  |  |  |  |  |  | 0 |  | 8,400,000
Series E Preferred Stock [Member] |  |  |  |  |  |  |  |  |
Preferred Stock, Dividend Rate, Percentage |  |  |  |  |  |  | 5.50% |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.855 |  |  |  |  |  |  |  |
Dividends Payable, Date of Record | Nov. 05, 2018 |  |  |  |  |  |  |  |
Dividends Payable, Date to be Paid | Nov. 14, 2018 |  |  |  |  |  |  |  |
Preferred Stock, Dividends, Declared | $ 300 |  |  |  |  |  |  |  |
General Partner [Member] |  |  |  |  |  |  |  |  |
Partnership Capital Distributions [Line Items] |  |  |  |  |  |  |  |  |
General partnership ownership interest |  |  |  |  |  | 2.00% |  |  |
ONEOK [Member] |  |  |  |  |  |  |  |  |
Aggregate Amount Of Common Shares Available For Issuance And Sale Under Equity Distribution Agreement |  |  |  |  |  |  | $ 1,000,000 |  |

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