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INCOME TAXES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Current tax expense (benefit)      
Federal $ (1,278) $ 260 $ 295
State 963 1,633 1,670
Total current tax expense (benefit) (315) 1,893 1,965
Deferred tax expense      
Federal 327,806 319,551 376,728
State 44,923 41,459 68,589
Total deferred tax expense 372,729 361,010 445,317
Income taxes 372,414 362,903 447,282
Income Tax Reconciliation      
Income before income taxes 1,650,991 1,517,935 1,040,801
Less: Net income attributable to noncontrolling interests 0 3,329 205,678
Net income attributable to ONEOK before income taxes $ 1,650,991 $ 1,514,606 $ 835,123
Federal statutory income tax rate 21.00% 21.00% 35.00%
Provision for federal income taxes $ 346,708 $ 318,067 $ 292,293
State income taxes, net of federal benefit 34,545 38,668 16,197
Deferred tax rate change, inclusive of valuation allowance 11,340 5,552 141,283
Other, net 804 5,260 (2,491)
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount (20,983) (4,644) 0
Deferred tax assets      
Employee benefits and other accrued liabilities 99,510 91,587  
Federal net operating loss 858,030 420,318  
State net operating loss and benefits 171,779 108,004  
Derivative instruments 83,710 22,108  
Other 12,769 13,378  
Total deferred tax assets 1,225,798 655,395  
Carryforward expected to expire prior to utilization (94,794) (73,820)  
Net deferred tax assets 1,131,004 581,575  
Deferred tax liabilities      
Excess of tax over book depreciation 84,631 73,113  
Investment in partnerships (a) 1,582,436 728,193  
Total deferred tax liabilities 1,667,067 801,306  
Net deferred tax assets (liabilities) 536,063 219,731  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 11,300 $ 5,600 $ 54,100