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DEBT (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Nov. 01, 2021
USD ($)
Rate
Jun. 30, 2021
USD ($)
Mar. 31, 2021
USD ($)
Jun. 30, 2020
USD ($)
Rate
Mar. 31, 2020
USD ($)
Rate
Sep. 30, 2019
USD ($)
Rate
Mar. 31, 2019
USD ($)
Rate
Dec. 31, 2021
USD ($)
Rate
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]                  
Total debt               $ 13,756,709 $ 14,361,644
Unamortized portion of terminated swaps               (11,596) (13,314)
Unamortized debt issuance costs and discounts               (124,855) (138,887)
Current maturities of long-term debt               (895,814) (7,650)
Short-term borrowings               0 0
Long-term debt               12,747,636 14,228,421
Letters of Credit Outstanding, Amount               7,700 7,700
Senior Note Covenant, Acceleration Of Indebtedness               $ 100,000  
Senior Note Covenant, Trustee Or Holders Percentage Required Upon Event Of Default               25.00%  
Long-term Debt, Repurchased Face Amount     $ 55,200           224,400
Repayments of Long-term Debt     $ 54,600           199,600
Gain (Loss) on Extinguishment of Debt                 22,300
$2.5 Billion Credit Agreement [Member]                  
Debt Instrument [Line Items]                  
Line of Credit Facility, Maximum Borrowing Capacity               $ 2,500,000  
Line of Credit Facility, Amount Outstanding               $ 0 0
Indebtedness to Adjusted EBITDA Maximum               5.0  
Line of Credit Facility, Sublimit               $ 100,000  
Line of Credit Facility, Swingline Subfacility               200,000  
Line Of Credit Facility, Option To Increase Borrowing Capacity               $ 3,500,000  
Line of Credit Facility, Annual Facility Fee               0.15%  
Indebtedness To Adjusted EBITDA Current               4.0  
Debt Instrument, Covenant Description               Among other things, these covenants include maintaining a ratio of indebtedness to adjusted EBITDA (EBITDA, as defined in our $2.5 Billion Credit Agreement, adjusted for all noncash charges and increased for projected EBITDA from certain lender-approved capital expansion projects) of no more than 5.0 to 1 at December 31, 2021. Our $2.5 Billion Credit Agreement includes a $100 million sublimit for the issuance of standby letters of credit and a $200 million sublimit for swingline loans. Under the terms of our $2.5 Billion Credit Agreement, we may request an increase in the size of the facility to an aggregate of $3.5 billion by either commitments from new lenders or increased commitments from existing lenders. Our $2.5 Billion Credit Agreement contains provisions for an applicable margin rate and an annual facility fee, both of which adjust with changes in our credit ratings. Based on our current credit ratings, borrowings, if any, will accrue at LIBOR, or alternate benchmark rate, plus 110 basis points, and the annual facility fee is 15 basis points. At December 31, 2021, our ratio of indebtedness to adjusted EBITDA was 4.0 to 1, and we were in compliance with all covenants under our $2.5 Billion Credit Agreement.  
$2.5 Billion Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Basis Spread on Variable Rate               1.10%  
Notes Payable from Public Offering Due 2026, 2031 and 2051 [Member]                  
Debt Instrument [Line Items]                  
Senior Notes, Noncurrent       $ 1,500,000          
Proceeds from Debt, Net of Issuance Costs       1,480,000          
Notes Payable from Public Offering Due 2025, 2030 and 2050 [Member]                  
Debt Instrument [Line Items]                  
Senior Notes, Noncurrent         $ 1,750,000        
Proceeds from Debt, Net of Issuance Costs         1,730,000        
Notes Payable from Public Offering Due 2024, 2029 and 2049 [Member]                  
Debt Instrument [Line Items]                  
Senior Notes, Noncurrent           $ 2,000,000      
Proceeds from Debt, Net of Issuance Costs           1,970,000      
Notes Payable from Public Offering Due 2029 and 2048 [Member]                  
Debt Instrument [Line Items]                  
Senior Notes, Noncurrent             $ 1,250,000    
Proceeds from Debt, Net of Issuance Costs             $ 1,230,000    
Interest Obligations on Debt                  
Debt Instrument [Line Items]                  
2022               $ 670,500  
2023               629,300  
2024               584,600  
2025               553,600  
2026               508,800  
Total Aggregate Maturities of Long-term Debt Outstanding and Interest Obligations on Debt                  
Debt Instrument [Line Items]                  
2022               1,566,300  
2023               1,554,300  
2024               1,084,600  
2025               1,440,600  
2026               1,108,800  
Senior Notes [Member]                  
Debt Instrument [Line Items]                  
2022               895,800  
2023               925,000  
2024               500,000  
2025               887,000  
2026               600,000  
Guardian Pipeline [Member] | Notes Payables 1 due 2022 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 0 13,657
Average interest rate (in hundredths) | Rate               7.85%  
Repayments of Long-term Debt   $ 11,700              
Subsidiary Issuer [Member] | 8.625% Notes Payables due 2019                  
Debt Instrument [Line Items]                  
Interest rates (in hundredths) | Rate             8.625%    
Repayments of Long-term Debt             $ 500,000    
Subsidiary Issuer [Member] | 3.80% Notes Payable due 2020                  
Debt Instrument [Line Items]                  
Extinguishment of Debt, Amount           $ 300,000      
Interest rates (in hundredths) | Rate           3.80%      
Debt Instrument, Redemption Price           $ 308,000      
Gain (Loss) on Extinguishment of Debt           (2,700)      
Subsidiary Issuer [Member] | 3.375% Notes Payable due 2022 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 895,814 895,814
Debt Instrument, Face Amount               $ 900,000  
Interest rates (in hundredths) | Rate               3.375%  
Subsidiary Issuer [Member] | 5.0% Notes Payable due 2023 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 425,000 425,000
Debt Instrument, Face Amount               $ 425,000  
Interest rates (in hundredths) | Rate               5.00%  
Subsidiary Issuer [Member] | 4.9% Notes Payable due 2025 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 500,000 500,000
Debt Instrument, Face Amount               $ 500,000  
Interest rates (in hundredths) | Rate               4.90%  
Subsidiary Issuer [Member] | 6.65% Notes Payable due 2036 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 600,000 600,000
Debt Instrument, Face Amount               $ 600,000  
Interest rates (in hundredths) | Rate               6.65%  
Subsidiary Issuer [Member] | 6.85% Notes Payable due 2037 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 600,000 600,000
Debt Instrument, Face Amount               $ 600,000  
Interest rates (in hundredths) | Rate               6.85%  
Subsidiary Issuer [Member] | 6.125% Notes Payable due 2041 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 650,000 650,000
Debt Instrument, Face Amount               $ 650,000  
Interest rates (in hundredths) | Rate               6.125%  
Subsidiary Issuer [Member] | 6.2% Notes Payable due 2043 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 400,000 400,000
Debt Instrument, Face Amount               $ 400,000  
Interest rates (in hundredths) | Rate               6.20%  
Parent Company                  
Debt Instrument [Line Items]                  
Commercial Paper               $ 0 0
Parent Company | Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Covenant Description               Our senior notes are governed by indentures containing covenants, including among other provisions, limitations on our ability to place liens on our property or assets and to sell and leaseback our property. The indentures governing our 6.875% senior notes due 2028 include an event of default upon acceleration of other indebtedness of $15 million or more, and the indentures governing the remainder of our senior notes include an event of default upon the acceleration of other indebtedness of $100 million or more. Such events of default would entitle the trustee or the holders of 25% in aggregate principal amount of the outstanding senior notes to declare those senior notes immediately due and payable in full. The indenture for the 7.5% notes due 2023 also contains a provision that allows the holders of the notes to require ONEOK to offer to repurchase all or any part of their notes if a change of control and a credit rating downgrade occur at a purchase price of 101% of the principal amount, plus accrued and unpaid interest, if any.  
Debt instrument call feature               We may redeem our senior notes, in whole or in part, at any time prior to their maturity at a redemption price equal to the principal amount, plus accrued and unpaid interest and a make-whole premium. We may redeem the balance of our senior notes due 2022, 2023, 2024, 2025, 2026, 2027, 2028 (4.55%), 2029, 2030, 2031, 2041, 2043, 2047, 2048, 2049, 2050 and 2051 at a redemption price equal to the principal amount, plus accrued and unpaid interest, starting one to six months before the maturity date as stipulated in the respective contract terms. Our senior notes are senior unsecured obligations, ranking equally in right of payment with all of our existing and future unsecured senior indebtedness.  
Parent Company | Term Loan Agreement due 2021 [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Face Amount       1,500,000          
Repayments of Long-term Debt       1,250,000   250,000      
Parent Company | 4.25% Notes Payable due 2022 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 0 541,877
Debt Instrument, Face Amount $ 700,000             $ 700,000  
Interest rates (in hundredths) | Rate 4.25%             4.25%  
Repayments of Long-term Debt $ 536,100                
Debt Instrument, Redemption Price, Percentage of Principal Amount Redeemed 100.00%                
Parent Company | 7.5% Notes Payable due 2023 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 500,000 500,000
Debt Instrument, Face Amount               $ 500,000  
Interest rates (in hundredths) | Rate               7.50%  
Senior Note Covenant, Redemption Price Upon Event Of Default | Rate               101.00%  
Parent Company | 2.75% Notes Payable due 2024 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 500,000 500,000
Debt Instrument, Face Amount           $ 500,000   $ 500,000  
Interest rates (in hundredths) | Rate           2.75%   2.75%  
Parent Company | 2.2% Notes Payable due 2025 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 387,000 387,000
Debt Instrument, Face Amount         $ 400,000     $ 400,000  
Interest rates (in hundredths) | Rate         2.20%     2.20%  
Parent Company | 5.85% Notes Payable due 2026 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 600,000 600,000
Debt Instrument, Face Amount       $ 600,000       $ 600,000  
Interest rates (in hundredths) | Rate       5.85%       5.85%  
Parent Company | 4.0% Notes Payable due 2027 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 500,000 500,000
Debt Instrument, Face Amount               $ 500,000  
Interest rates (in hundredths) | Rate               4.00%  
Parent Company | 4.55% Notes Payable due 2028 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 800,000 800,000
Debt Instrument, Face Amount               $ 800,000  
Interest rates (in hundredths) | Rate               4.55%  
Parent Company | 6.875% Notes Payable due 2028 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 100,000 100,000
Debt Instrument, Face Amount               $ 100,000  
Interest rates (in hundredths) | Rate               6.875%  
Senior Note Covenant, Acceleration Of Indebtedness               $ 15,000  
Parent Company | 4.35% Notes Payable due 2029 [Member]                  
Debt Instrument [Line Items]                  
Total debt               700,000 700,000
Debt Instrument, Face Amount             $ 700,000 $ 700,000  
Interest rates (in hundredths) | Rate             4.35% 4.35%  
Parent Company | 3.4% Notes Payable due 2029 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 714,251 714,251
Debt Instrument, Face Amount           $ 750,000   $ 750,000  
Interest rates (in hundredths) | Rate           3.40%   3.40%  
Parent Company | 3.1% Notes Payable due 2030 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 780,093 780,093
Debt Instrument, Face Amount         $ 850,000     $ 850,000  
Interest rates (in hundredths) | Rate         3.10%     3.10%  
Parent Company | 6.35% Notes Payable due 2031 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 600,000 600,000
Debt Instrument, Face Amount       $ 600,000       $ 600,000  
Interest rates (in hundredths) | Rate       6.35%       6.35%  
Parent Company | 6.0% Notes Payable due 2035 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 400,000 400,000
Debt Instrument, Face Amount               $ 400,000  
Interest rates (in hundredths) | Rate               6.00%  
Parent Company | 4.95% Notes Payable due 2047 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 689,006 689,006
Debt Instrument, Face Amount               $ 700,000  
Interest rates (in hundredths) | Rate               4.95%  
Parent Company | 5.2% Notes Payable due 2048 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 1,000,000 1,000,000
Debt Instrument, Face Amount               $ 1,000,000  
Interest rates (in hundredths) | Rate               5.20%  
Parent Company | Note Payables, Additional Issuance, due 2048 [Member]                  
Debt Instrument [Line Items]                  
Debt Instrument, Face Amount             $ 550,000    
Interest rates (in hundredths) | Rate             5.20%    
Parent Company | 4.45% Notes Payable due 2049 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 672,530 713,676
Debt Instrument, Face Amount           $ 750,000   $ 750,000  
Interest rates (in hundredths) | Rate           4.45%   4.45%  
Parent Company | 4.5% Notes Payable due 2050 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 443,015 451,270
Debt Instrument, Face Amount         $ 500,000     $ 500,000  
Interest rates (in hundredths) | Rate         4.50%     4.50%  
Parent Company | 7.15% Notes Payable due 2051 [Member]                  
Debt Instrument [Line Items]                  
Total debt               $ 300,000 $ 300,000
Debt Instrument, Face Amount       $ 300,000       $ 300,000  
Interest rates (in hundredths) | Rate       7.15%       7.15%