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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Entity [Line Items] |  |  |  |
Equity Method Investment, Ownership Percentage |  | 50.00% |  |
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. |  |  |
Deferred Tax Assets, Gross, Noncurrent | $ 2,100,000 |  |  |
Deferred Tax Asset, Tax Basis | 8,800,000 |  |  |
Deferred Tax Asset, Book Basis | $ 3,000,000 |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  | 21.00% | 35.00% | 35.00%
General partner ownership interest | 41.20% | 100.00% |  |
Common stock |  | $ 1,203,981 | $ 471,358 | $ 21,971
Accumulated other comprehensive loss |  |  | (40,288) |
Noncontrolling interests in consolidated subsidiaries |  |  | $ 2,146,462 |
Number Of Years Of Service Employees Must Work To Be Entitled To Postretirement Medical And Life Insurance Benefits |  |  | 5 years |
ONEOK |  |  |  |
Entity [Line Items] |  |  |  |
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent | 37.00% |  |  |
Common stock | $ 1,700 |  |  |
Paid-in capital | 5,228,600 |  |  |
Accumulated other comprehensive loss | (40,300) |  |  |
Noncontrolling interests in consolidated subsidiaries | (3,043,500) |  |  |
Deferred income taxes | $ (2,146,500) |  |  |

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