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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