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REVENUE REVENUE (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Jan. 01, 2018
Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Retained earnings increase $ 0   $ 0     $ 0
Services revenue 285,267,000 $ 564,763,000 567,340,000 $ 1,097,657,000    
Cost of sales and fuel (exclusive of depreciation and operating costs) 2,175,818,000 2,091,022,000 4,543,844,000 4,234,865,000    
Depreciation and amortization 106,288,000 100,849,000 210,525,000 200,268,000    
Income taxes 87,531,000 43,844,000 163,302,000 98,785,000    
Net income 282,179,000 175,991,000 548,228,000 362,176,000    
Net Income Attributable to Noncontrolling Interests 1,131,000 104,298,000 2,672,000 203,122,000    
Net Income Attributable to ONEOK 281,048,000 $ 71,693,000 545,556,000 $ 159,054,000    
Accounts receivable, net 934,664,000   934,664,000     1,202,951,000
Natural gas and natural gas liquids in storage 285,776,000   285,776,000     342,293,000
Other current assets 57,286,000   57,286,000     53,008,000
Property, plant and equipment 16,363,716,000   16,363,716,000     15,559,667,000
Accumulated depreciation and amortization 3,059,799,000   3,059,799,000     2,861,541,000
Deferred income taxes 31,503,000   31,503,000     205,907,000
Other assets 170,124,000   170,124,000     180,830,000
Accounts payable 1,027,467,000   1,027,467,000     1,140,571,000
Other current liabilities 184,127,000   184,127,000     179,971,000
Other deferred credits 357,184,000   357,184,000     348,924,000
Retained earnings/paid-in capital 7,699,934,000   7,699,934,000     6,588,878,000
Noncontrolling interests in consolidated subsidiaries 173,623,000   173,623,000     157,485,000
Customer receivables 926,100,000   926,100,000     $ 1,200,000,000
Contract asset balance 6,400,000   6,400,000   $ 6,400,000  
Cash received in excess of revenue recognized (400,000.0)   (400,000.0)      
Contract Asset Net Additions 400,000.0   400,000.0      
Contract with Customer, Asset, Net, Current 1,400,000   1,400,000   900,000  
Contract with Customer, Asset, Net, Noncurrent 5,000,000   5,000,000      
Contract with Customer, Liability 42,800,000.0   42,800,000.0   33,300,000.0  
Revenue recognized included in beginning balance     (18,300,000.0)      
Contract Liability, Net Additions 27,800,000.0   27,800,000.0      
Contract with Customer, Liability, Current 27,800,000   27,800,000   19,500,000  
Contract with Customer, Liability, Noncurrent 15,000,000   15,000,000      
Performance obligations expected to be recognized in revenue 1,952,100,000.0   1,952,100,000.0      
2018 [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Performance obligations expected to be recognized in revenue 168,458,491.0   168,458,491.0      
2019 [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Performance obligations expected to be recognized in revenue 271,597,497.0   271,597,497.0      
2020 [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Performance obligations expected to be recognized in revenue 226,139,404.0   226,139,404.0      
2021 [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Performance obligations expected to be recognized in revenue 219,194,609.0   219,194,609.0      
Thereafter [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Performance obligations expected to be recognized in revenue 1,066,738,432.0   1,066,738,432.0      
Calculated under Revenue Guidance in Effect before Topic 606 [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Services revenue 644,615,000   1,278,930,000      
Cost of sales and fuel (exclusive of depreciation and operating costs) 2,523,916,000   5,249,690,000      
Depreciation and amortization 106,142,000   210,234,000      
Income taxes 90,151,000   164,690,000      
Net income 290,955,000   552,875,000      
Net Income Attributable to Noncontrolling Interests 1,128,000   2,667,000      
Net Income Attributable to ONEOK 289,827,000   550,208,000      
Accounts receivable, net 1,056,974,000   1,056,974,000      
Natural gas and natural gas liquids in storage 299,616,000   299,616,000      
Other current assets 56,230,000   56,230,000      
Property, plant and equipment 16,341,524,000   16,341,524,000      
Accumulated depreciation and amortization 3,058,136,000   3,058,136,000      
Deferred income taxes 30,617,000   30,617,000      
Other assets 165,130,000   165,130,000      
Accounts payable 1,149,777,000   1,149,777,000      
Other current liabilities 182,577,000   182,577,000      
Other deferred credits 342,162,000   342,162,000      
Retained earnings/paid-in capital 7,702,903,000   7,702,903,000      
Noncontrolling interests in consolidated subsidiaries 173,601,000   173,601,000      
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Services revenue (359,348,000)   (711,590,000)      
Cost of sales and fuel (exclusive of depreciation and operating costs) (348,098,000)   (705,846,000)      
Depreciation and amortization 146,000   291,000      
Income taxes (2,620,000)   (1,388,000)      
Net income (8,776,000)   (4,647,000)      
Net Income Attributable to Noncontrolling Interests 3,000   5,000      
Net Income Attributable to ONEOK (8,779,000)   (4,652,000)      
Accounts receivable, net (122,310,000)   (122,310,000)      
Natural gas and natural gas liquids in storage (13,840,000)   (13,840,000)      
Other current assets 1,056,000   1,056,000      
Property, plant and equipment 22,192,000   22,192,000      
Accumulated depreciation and amortization 1,663,000   1,663,000      
Deferred income taxes 886,000   886,000      
Other assets 4,994,000   4,994,000      
Accounts payable (122,310,000)   (122,310,000)      
Other current liabilities 1,550,000   1,550,000      
Other deferred credits 15,022,000   15,022,000      
Retained earnings/paid-in capital (2,969,000)   (2,969,000)      
Noncontrolling interests in consolidated subsidiaries $ 22,000   $ 22,000      
Retained Earnings            
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]            
Retained earnings increase         $ 1,700,000