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DEBT (Notes)
 12 Months Ended
Dec. 31, 2021
Long-term Debt, Unclassified [Abstract]  
DEBT DEBT
The following table sets forth our consolidated debt for the periods indicated:
December 31,
2021		December 31,
2020
(Thousands of dollars)
Commercial paper outstanding$— $— 
Senior unsecured obligations:
$700,000 at 4.25% due February 2022
— 541,877 
$900,000 at 3.375% due October 2022
895,814 895,814 
$425,000 at 5.0% due September 2023
425,000 425,000 
$500,000 at 7.5% due September 2023
500,000 500,000 
$500,000 at 2.75% due September 2024
500,000 500,000 
$500,000 at 4.9% due March 2025
500,000 500,000 
$400,000 at 2.2% due September 2025
387,000 387,000 
$600,000 at 5.85% due January 2026
600,000 600,000 
$500,000 at 4.0% due July 2027
500,000 500,000 
$800,000 at 4.55% due July 2028
800,000 800,000 
$100,000 at 6.875% due September 2028
100,000 100,000 
$700,000 at 4.35% due March 2029
700,000 700,000 
$750,000 at 3.4% due September 2029
714,251 714,251 
$850,000 at 3.1% due March 2030
780,093 780,093 
$600,000 at 6.35% due January 2031
600,000 600,000 
$400,000 at 6.0% due June 2035
400,000 400,000 
$600,000 at 6.65% due October 2036
600,000 600,000 
$600,000 at 6.85% due October 2037
600,000 600,000 
$650,000 at 6.125% due February 2041
650,000 650,000 
$400,000 at 6.2% due September 2043
400,000 400,000 
$700,000 at 4.95% due July 2047
689,006 689,006 
$1,000,000 at 5.2% due July 2048
1,000,000 1,000,000 
$750,000 at 4.45% due September 2049
672,530 713,676 
$500,000 at 4.5% due March 2050
443,015 451,270 
$300,000 at 7.15% due January 2051
300,000 300,000 
Guardian Pipeline
Weighted average 7.85% due December 2022
— 13,657 
Total debt13,756,709 14,361,644 
Unamortized portion of terminated swaps11,596 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 (a) — — 
Long-term debt$12,747,636 $14,228,421 
(a) - Individual issuances of commercial paper under our commercial paper program generally mature in 90 days or less.

$2.5 Billion Credit Agreement - Our $2.5 Billion Credit Agreement, which expires in June 2024, is a revolving credit facility and contains certain financial, operational and legal covenants. 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.

At December 31, 2021 and 2020, we had letters of credit issued totaling $7.7 million, and no borrowings outstanding under our $2.5 Billion Credit Agreement.

Senior Unsecured Obligations - All notes are senior unsecured obligations, ranking equally in right of payment with all of our existing and future unsecured senior indebtedness, and are structurally subordinate to any of the existing and future debt and other liabilities of any non-guarantor subsidiaries.

Issuances - In May 2020, we completed an underwritten public offering of $1.5 billion senior unsecured notes consisting of $600 million, 5.85% senior notes due 2026; $600 million, 6.35% senior notes due 2031; and $300 million, 7.15% senior notes due 2051. The net proceeds, after deducting underwriting discounts, commissions and offering expenses, were $1.48 billion. A portion of the proceeds was used to repay the outstanding borrowings under our $1.5 Billion Term Loan Agreement. The remainder was used for general corporate purposes.

In March 2020, we completed an underwritten public offering of $1.75 billion senior unsecured notes consisting of $400 million, 2.2% senior notes due 2025; $850 million, 3.1% senior notes due 2030; and $500 million, 4.5% senior notes due 2050. The net proceeds, after deducting underwriting discounts, commissions and offering expenses, were $1.73 billion. A portion of the proceeds was used to pay all outstanding amounts under our commercial paper program. The remainder was used for general corporate purposes, which included repayment of other existing indebtedness and funding capital expenditures.

In August 2019, we completed an underwritten public offering of $2.0 billion senior unsecured notes consisting of $500 million, 2.75% senior notes due 2024; $750 million, 3.4% senior notes due 2029; and $750 million, 4.45% senior notes due 2049. The net proceeds, after deducting underwriting discounts, commissions and offering expenses, were $1.97 billion. The proceeds were used for general corporate purposes, including repayment of existing indebtedness and funding capital expenditures.

In March 2019, we completed an underwritten public offering of $1.25 billion senior unsecured notes consisting of $700 million, 4.35% senior notes due 2029 and an additional issuance of $550 million of our existing 5.2% senior notes due 2048. The net proceeds, after deducting underwriting discounts, commissions and offering expenses, and exclusive of accrued interest, were $1.23 billion. The proceeds were used for general corporate purposes, including repayment of existing indebtedness and funding capital expenditures.

Repayments - In November 2021, we redeemed the remaining $536.1 million of our $700 million, 4.25% senior notes due February 2022 at 100% of the principal amount, plus accrued and unpaid interest, with cash on hand and short-term borrowings.

In June 2021, we repaid the remaining $11.7 million of Guardian Pipeline’s senior notes due December 2022 with cash on hand.

In 2021, we repurchased in the open market outstanding principal of certain of our senior notes in the amount of $55.2 million for an aggregate repurchase price of $54.6 million with cash on hand.

In May 2020, we repaid the remaining $1.25 billion of our $1.5 Billion Term Loan Agreement with cash on hand from our May 2020 public offering of $1.5 billion senior unsecured notes.

In 2020, we repurchased in the open market outstanding principal of certain of our senior notes in the amount of $224.4 million for an aggregate repurchase price of $199.6 million with cash on hand. In connection with these open market repurchases, we recognized $22.3 million of net gains on extinguishment of debt, which is included in other income in our Consolidated Statement of Income for the year ended December 31, 2020.

In September 2019, we redeemed our $300 million, 3.8% senior notes due March 2020 at a redemption price of $308.0 million, including the outstanding principal, plus accrued and unpaid interest, with cash on hand from our public offering of $2.0 billion senior unsecured notes in August 2019. In connection with this early redemption, we incurred a $2.7 million loss on extinguishment of debt, which is included in other expense in our Consolidated Statements of Income for the year ended December 31, 2019.

In August 2019, we repaid $250 million of our $1.5 Billion Term Loan agreement with cash on hand.
In March 2019, we repaid our $500 million, 8.625% senior notes at maturity with a combination of cash on hand and short-term borrowings.

The aggregate maturities of long-term debt outstanding and interest obligations on debt as of December 31, 2021, for the years 2022 through 2026 are shown below:
Senior
Unsecured
Obligations		Interest
Obligations
on Debt		Total
 (Millions of dollars)
2022$895.8 $670.5 $1,566.3 
2023$925.0 $629.3 $1,554.3 
2024$500.0 $584.6 $1,084.6 
2025$887.0 $553.6 $1,440.6 
2026$600.0 $508.8 $1,108.8 

Covenants - 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.

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.

Other - We amortize premiums, discounts and expenses incurred in connection with the issuance of long-term debt consistent with the terms of the respective debt instrument.

Debt Guarantees - ONEOK, ONEOK Partners and the Intermediate Partnership have cross guarantees in place for our and ONEOK Partners’ indebtedness.