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EQUITY (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  | 20.00% |  |  | 20.00% |  | 20.00%
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 |  | $ 0.795 | $ 0.77 |  | $ 1.565 | $ 1.230 |
Common Stock, Dividends, Per Share, Declared |  | $ 0.795 |  | $ 0.615 | $ 1.565 | $ 1.230 |
Dividends, Preferred Stock, Cash |  | $ 300 | $ 300 |  |  |  |
Preferred Stock, Dividends, Declared |  |  |  |  | $ 550 | $ 217 |
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 |  |  |  |  | 100.00% | 41.20% | 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] |  |  |  |  |  |  |
Business Combination, Consideration Transferred | $ 195,000 |  |  |  |  |  |
Common Stock, Dividends, Per Share, Declared | $ 0.825 |  |  |  |  |  |
Dividends Payable, Date of Record | Aug. 06, 2018 |  |  |  |  |  |
Dividends Payable, Date to be Paid | Aug. 14, 2018 |  |  |  |  |  |
Preferred Stock, Dividends, Declared | $ 300 |  |  |  |  |  |
Business Acquisition, Description of Acquired Entity | On July 31, 2018, we acquired the remaining 20 percent interest in WTLPG for $195 million. |  |  |  |  |  |
Distribution Paid [Member] |  |  |  |  |  |  |
Partnership Capital Distributions [Line Items] |  |  |  |  |  |  |
Distribution per unit |  |  |  | $ 0.79 |  | $ 1.58 |
Total distributions paid |  |  |  | $ 333,000 |  | $ 666,001 |
ONEOK [Member] | Distribution Paid [Member] |  |  |  |  |  |  |
Partnership Capital Distributions [Line Items] |  |  |  |  |  |  |
Limited partner distributions to ONEOK |  |  |  | 90,323 |  | $ 180,646 |
General Partner [Member] |  |  |  |  |  |  |
Partnership Capital Distributions [Line Items] |  |  |  |  |  |  |
General partnership ownership interest |  |  |  |  |  | 2.00% |
General Partner [Member] | Distribution Paid [Member] |  |  |  |  |  |  |
Partnership Capital Distributions [Line Items] |  |  |  |  |  |  |
General partner distributions |  |  |  | 6,660 |  | $ 13,320 |
Incentive distributions |  |  |  | 100,538 |  | 201,076 |
Distributions to general partner |  |  |  | 107,198 |  | 214,396 |
Limited Partner [Member] | Distribution Paid [Member] |  |  |  |  |  |  |
Partnership Capital Distributions [Line Items] |  |  |  |  |  |  |
Limited partner distributions to other unitholders |  |  |  | $ 135,479 |  | $ 270,959 |
ONEOK [Member] |  |  |  |  |  |  |
Aggregate Amount Of Common Shares Available For Issuance And Sale Under Equity Distribution Agreement |  |  |  |  | $ 1,000,000 |  |

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