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INCOME TAXES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 21.00% 21.00% 21.00%
Current tax expense (benefit)      
Federal $ 980 $ (1,278) $ 260
State 1,797 963 1,633
Total current tax expense (benefit) 2,777 (315) 1,893
Deferred tax expense      
Federal 154,068 327,806 319,551
State 32,662 44,923 41,459
Total deferred tax expense 186,730 372,729 361,010
Income tax expense 189,507 372,414 362,903
Income Tax Reconciliation      
Income before income taxes 802,316 1,650,991 1,517,935
Net Income (Loss) Attributable to Noncontrolling Interest 0 0 3,329
Net income attributable to ONEOK before income taxes $ 802,316 $ 1,650,991 $ 1,514,606
Federal statutory income tax rate 21.00% 21.00% 21.00%
Provision for federal income taxes $ 168,486 $ 346,708 $ 318,067
State income taxes, net of federal benefit 13,580 34,545 38,668
Deferred tax rate change, inclusive of valuation allowance 20,879 11,340 5,552
Other, net (6,058) 804 5,260
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount (7,380) (20,983) (4,644)
Deferred tax assets      
Employee benefits and other accrued liabilities 96,741 99,510  
Federal net operating loss 1,473,093 858,030  
State net operating loss and benefits 258,929 171,779  
Derivative instruments 134,499 83,710  
Other 12,894 12,769  
Total deferred tax assets 1,976,156 1,225,798  
Carryforward expected to expire prior to utilization (121,212) (94,794)  
Net deferred tax assets 1,854,944 1,131,004  
Deferred tax liabilities      
Excess of tax over book depreciation 87,021 84,631  
Investment in partnerships (a) 2,437,620 1,582,436  
Total deferred tax liabilities 2,524,641 1,667,067  
Net deferred tax assets (liabilities) 669,697 536,063  
Valuation Allowance, Deferred Tax Asset, Increase (Decrease), Amount $ 20,900 $ 11,300 $ 5,600