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DEBT - Schedule of Consolidated Debt (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]      
Commercial Paper $ 0 $ 0 $ 0
Current maturities of long-term debt (1,059) (1,059) (484)
Long-term debt, excluding current maturities (Note H) 31,018 31,018 21,183
EnLink Controlling Interest Acquisition      
Debt Instrument [Line Items]      
Total ONEOK and ONEOK Partners debt 4,613 4,613  
Unamortized debt discounts (8) (8)  
Current maturities of long-term debt (422) (422)  
Long-term debt, excluding current maturities (Note H) 4,183 4,183  
$500 at 2.75% due September 2024      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 500 $ 500  
Interest rate 2.75% 2.75%  
Total ONEOK and ONEOK Partners debt $ 0 $ 0 484
$500 at 4.9% due March 2025      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 500 $ 500  
Interest rate 4.90% 4.90%  
Total ONEOK and ONEOK Partners debt $ 0 $ 0 500
Repayments of long-term debt 500    
$250 at 3.2% due March 2025      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 250 $ 250  
Interest rate 3.20% 3.20%  
Total ONEOK and ONEOK Partners debt $ 250 $ 250 250
$400 at 2.2% due September 2025      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 400 $ 400  
Interest rate 2.20% 2.20%  
Total ONEOK and ONEOK Partners debt $ 387 $ 387 387
$600 at 5.85% due January 2026      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 600 $ 600  
Interest rate 5.85% 5.85%  
Total ONEOK and ONEOK Partners debt $ 600 $ 600 600
$650 at 5.0% due March 2026      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 650 $ 650  
Interest rate 5.00% 5.00%  
Total ONEOK and ONEOK Partners debt $ 650 $ 650 650
$750 at 5.55% due November 2026      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 750 $ 750  
Interest rate 5.55% 5.55%  
Total ONEOK and ONEOK Partners debt $ 750 $ 750 750
$500 at 4.0% due July 2027      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 500 $ 500  
Interest rate 4.00% 4.00%  
Total ONEOK and ONEOK Partners debt $ 500 $ 500 500
$1,250 at 4.25% due September 2027      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 1,250 $ 1,250  
Interest rate 4.25% 4.25%  
Total ONEOK and ONEOK Partners debt $ 1,250 $ 1,250 0
$800 at 4.55% due July 2028      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 800 $ 800  
Interest rate 4.55% 4.55%  
Total ONEOK and ONEOK Partners debt $ 800 $ 800 800
$100 at 6.875% due September 2028      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 100 $ 100  
Interest rate 6.875% 6.875%  
Total ONEOK and ONEOK Partners debt $ 100 $ 100 100
$750 at 5.65% due November 2028      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 750 $ 750  
Interest rate 5.65% 5.65%  
Total ONEOK and ONEOK Partners debt $ 750 $ 750 750
$700 at 4.35% due March 2029      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 700 $ 700  
Interest rate 4.35% 4.35%  
Total ONEOK and ONEOK Partners debt $ 700 $ 700 700
$750 at 3.4% due September 2029      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 750 $ 750  
Interest rate 3.40% 3.40%  
Total ONEOK and ONEOK Partners debt $ 714 $ 714 714
$600 at 4.4% due October 2029      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 600 $ 600  
Interest rate 4.40% 4.40%  
Total ONEOK and ONEOK Partners debt $ 600 $ 600 0
$850 at 3.1% due March 2030      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 850 $ 850  
Interest rate 3.10% 3.10%  
Total ONEOK and ONEOK Partners debt $ 780 $ 780 780
$500 at 3.25% due June 2030      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 500 $ 500  
Interest rate 3.25% 3.25%  
Total ONEOK and ONEOK Partners debt $ 500 $ 500 500
$500 at 5.8% due November 2030      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 500 $ 500  
Interest rate 5.80% 5.80%  
Total ONEOK and ONEOK Partners debt $ 500 $ 500 500
$600 at 6.35% due January 2031      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 600 $ 600  
Interest rate 6.35% 6.35%  
Total ONEOK and ONEOK Partners debt $ 600 $ 600 600
$1,250 at 4.75% due October 2031      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 1,250 $ 1,250  
Interest rate 4.75% 4.75%  
Total ONEOK and ONEOK Partners debt $ 1,250 $ 1,250 0
$750 at 6.1% due November 2032      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 750 $ 750  
Interest rate 6.10% 6.10%  
Total ONEOK and ONEOK Partners debt $ 750 $ 750 750
$1,500 at 6.05% due September 2033      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 1,500 $ 1,500  
Interest rate 6.05% 6.05%  
Total ONEOK and ONEOK Partners debt $ 1,500 $ 1,500 1,500
$1,600 at 5.05% due November 2034      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 1,600 $ 1,600  
Interest rate 5.05% 5.05%  
Total ONEOK and ONEOK Partners debt $ 1,600 $ 1,600 0
$400 at 6.0% due June 2035      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 400 $ 400  
Interest rate 6.00% 6.00%  
Total ONEOK and ONEOK Partners debt $ 400 $ 400 400
$600 at 6.65% due October 2036      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 600 $ 600  
Interest rate 6.65% 6.65%  
Total ONEOK and ONEOK Partners debt $ 600 $ 600 600
$250 at 6.4% due May 2037      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 250 $ 250  
Interest rate 6.40% 6.40%  
Total ONEOK and ONEOK Partners debt $ 250 $ 250 250
$600 at 6.85% due October 2037      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 600 $ 600  
Interest rate 6.85% 6.85%  
Total ONEOK and ONEOK Partners debt $ 600 $ 600 600
$650 at 6.125% due February 2041      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 650 $ 650  
Interest rate 6.125% 6.125%  
Total ONEOK and ONEOK Partners debt $ 650 $ 650 650
$250 at 4.2% due December 2042      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 250 $ 250  
Interest rate 4.20% 4.20%  
Total ONEOK and ONEOK Partners debt $ 250 $ 250 250
$400 at 6.2% due September 2043      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 400 $ 400  
Interest rate 6.20% 6.20%  
Total ONEOK and ONEOK Partners debt $ 400 $ 400 400
$550 at 5.15% due October 2043      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 550 $ 550  
Interest rate 5.15% 5.15%  
Total ONEOK and ONEOK Partners debt $ 550 $ 550 550
$250 at 4.2% due March 2045      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 250 $ 250  
Interest rate 4.20% 4.20%  
Total ONEOK and ONEOK Partners debt $ 250 $ 250 250
$500 at 4.25% due September 2046      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 500 $ 500  
Interest rate 4.25% 4.25%  
Total ONEOK and ONEOK Partners debt $ 500 $ 500 500
$700 at 4.95% due July 2047      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 700 $ 700  
Interest rate 4.95% 4.95%  
Total ONEOK and ONEOK Partners debt $ 564 $ 564 564
$500 at 4.2% due October 2047      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 500 $ 500  
Interest rate 4.20% 4.20%  
Total ONEOK and ONEOK Partners debt $ 500 $ 500 500
$1,000 at 5.2% due July 2048      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 1,000 $ 1,000  
Interest rate 5.20% 5.20%  
Total ONEOK and ONEOK Partners debt $ 919 $ 919 919
$500 at 4.85% due February 2049      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 500 $ 500  
Interest rate 4.85% 4.85%  
Total ONEOK and ONEOK Partners debt $ 500 $ 500 500
$750 at 4.45% due September 2049      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 750 $ 750  
Interest rate 4.45% 4.45%  
Total ONEOK and ONEOK Partners debt $ 576 $ 576 576
$500 at 4.5% due March 2050      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 500 $ 500  
Interest rate 4.50% 4.50%  
Total ONEOK and ONEOK Partners debt $ 443 $ 443 443
$800 at 3.95% due March 2050      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 800 $ 800  
Interest rate 3.95% 3.95%  
Total ONEOK and ONEOK Partners debt $ 797 $ 797 797
$300 at 7.15% due January 2051      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 300 $ 300  
Interest rate 7.15% 7.15%  
Total ONEOK and ONEOK Partners debt $ 300 $ 300 300
$1,750 at 6.625% due September 2053      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 1,750 $ 1,750  
Interest rate 6.625% 6.625%  
Total ONEOK and ONEOK Partners debt $ 1,750 $ 1,750 1,750
$1,500 at 5.7% due November 2054      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 1,500 $ 1,500  
Interest rate 5.70% 5.70%  
Total ONEOK and ONEOK Partners debt $ 1,500 $ 1,500 0
$800 at 5.85% due November 2064      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 800 $ 800  
Interest rate 5.85% 5.85%  
Total ONEOK and ONEOK Partners debt $ 800 $ 800 0
$750 at 4.15% due June 2025 | EnLink Controlling Interest Acquisition      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 750 $ 750  
Interest rate 4.15% 4.15%  
Total ONEOK and ONEOK Partners debt $ 422 $ 422  
$500 at 4.85% due July 2026 | EnLink Controlling Interest Acquisition      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 500 $ 500  
Interest rate 4.85% 4.85%  
Total ONEOK and ONEOK Partners debt $ 491 $ 491  
$500 at 5.625% due January 2028 | EnLink Controlling Interest Acquisition      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 500 $ 500  
Interest rate 5.625% 5.625%  
Total ONEOK and ONEOK Partners debt $ 500 $ 500  
$500 at 5.375% due June 2029 | EnLink Controlling Interest Acquisition      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 500 $ 500  
Interest rate 5.375% 5.375%  
Total ONEOK and ONEOK Partners debt $ 499 $ 499  
$1,000 at 6.5% due September 2030 | EnLink Controlling Interest Acquisition      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 1,000 $ 1,000  
Interest rate 6.50% 6.50%  
Total ONEOK and ONEOK Partners debt $ 1,000 $ 1,000  
$500 at 5.65% due September 2034 | EnLink Controlling Interest Acquisition      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 500 $ 500  
Interest rate 5.65% 5.65%  
Total ONEOK and ONEOK Partners debt $ 500 $ 500  
$350 at 5.6% due April 2044 | EnLink Controlling Interest Acquisition      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 350 $ 350  
Interest rate 5.60% 5.60%  
Total ONEOK and ONEOK Partners debt $ 340 $ 340  
$450 at 5.05% due April 2045 | EnLink Controlling Interest Acquisition      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 450 $ 450  
Interest rate 5.05% 5.05%  
Total ONEOK and ONEOK Partners debt $ 413 $ 413  
$500 at 5.45% due June 2047 | EnLink Controlling Interest Acquisition      
Debt Instrument [Line Items]      
Debt instrument, face amount $ 500 $ 500  
Interest rate 5.45% 5.45%  
Total ONEOK and ONEOK Partners debt $ 448 $ 448  
Guardian 6.58% Term Loan      
Debt Instrument [Line Items]      
Debt instrument, face amount     120
Total ONEOK and ONEOK Partners debt 0 0 $ 120
Debt instrument, interest rate (as a percent)     6.58%
Repayments of long-term debt   120  
Viking 6.71% Term Loan      
Debt Instrument [Line Items]      
Debt instrument, face amount     $ 60
Total ONEOK and ONEOK Partners debt 0 0 $ 60
Debt instrument, interest rate (as a percent)     6.71%
Repayments of long-term debt   60  
Excluding Enlink Debt      
Debt Instrument [Line Items]      
Total ONEOK and ONEOK Partners debt 28,630 28,630 $ 22,794
Unamortized debt discounts (992) (992) (1,015)
Unamortized debt issuance costs and terminated swaps (166) (166) (112)
Current maturities of long-term debt (637) (637) (484)
Long-term debt, excluding current maturities (Note H) $ 26,835 $ 26,835 $ 21,183