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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

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