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Debt | 3 Months Ended
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Mar. 31, 2024
Debt |
Debt | 3. Debt The following table summarizes the major components of debt at principal amounts as of each balance sheet date (in millions) and provides the maturities and interest rate ranges of each major category as of March 31, 2024:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ |  | 2024 |  | 2023
Commercial paper program (weighted average interest rate of 5.5% as of March 31, 2024 and 5.6% as of December 31, 2023) | ​ | $ | 750 | ​ | $ | 860
Senior notes, maturing through 2050, interest rates ranging from 0.75% to 7.75% (weighted average interest rate of 3.7% as of March 31, 2024 and 3.7% as of December 31, 2023) | ​ | ​ | 11,376 | ​ | ​ | 11,376
Canadian senior notes, C$500 million maturing September 2026, interest rate of 2.6% | ​ |  | 369 | ​ |  | 378
Tax-exempt bonds, maturing through 2053, fixed and variable interest rates ranging from 0.55% to 5.0% (weighted average interest rate of 3.2% as of March 31, 2024 and 3.3% as of December 31, 2023) | ​ |  | 2,883 | ​ |  | 2,883
Financing leases and other, maturing through 2082 (weighted average interest rate of 4.9% as of March 31, 2024 and 5.0% as of December 31, 2023) (a) | ​ |  | 838 | ​ |  | 855
Debt issuance costs, discounts and other | ​ |  | (118) | ​ |  | (123)
​ | ​ |  | 16,098 | ​ |  | 16,229
Current portion of long-term debt | ​ |  | 336 | ​ |  | 334
Long-term debt, less current portion | ​ | $ | 15,762 | ​ | $ | 15,895
(a) | Excluding our landfill financing leases, the maturities of our financing leases and other debt obligations extend through 2059.
Debt Classification As of March 31, 2024, we had approximately $3.1 billion of debt maturing within the next 12 months, including (i) $750 million of short-term borrowings under our commercial paper program (net of related discount on issuance); (ii) $1.6 billion of tax-exempt bonds with term interest rate periods that expire within the next 12 months, which is prior to their scheduled maturities; (iii) $156 million of 3.5% senior notes that mature in May 2024; (iv) $422 million of 3.125% senior notes that mature in March 2025 and (v) $180 million of other debt with scheduled maturities within the next 12 months, including $60 million of tax-exempt bonds. As of March 31, 2024, we have classified $2.8 billion of debt maturing in the next 12 months as long-term because we have the intent and ability to refinance these borrowings on a long-term basis as supported by the forecasted available capacity under our $3.5 billion long-term U.S. and Canadian revolving credit facility (“$3.5 billion revolving credit facility”), as discussed below. The remaining $336 million of debt maturing in the next 12 months is classified as current obligations. Access to and Utilization of Credit Facilities and Commercial Paper Program $3.5 Billion Revolving Credit Facility — Our $3.5 billion revolving credit facility, maturing May 2027, provides us with credit capacity to be used for cash borrowings, to support letters of credit and to support our commercial paper program. The interest rates we pay on outstanding U.S. or Canadian loans are based on the Secured Overnight Financing Rate (“SOFR”) administered by the Federal Reserve Bank of New York or the Canadian Dollar Offered Rate (“CDOR”), respectively, plus a spread depending on WMI’s senior public debt rating assigned by Moody’s Investors Service, Inc. and Standard and Poor’s Global Ratings. As of March 31, 2024, we had no outstanding borrowings under this facility. We had $181 million of letters of credit issued and $750 million of outstanding borrowings (net of related discount on issuance) under our commercial paper program, both supported by the facility, leaving unused and available credit capacity of $2.6 billion as of March 31, 2024. WM Holdings, a wholly-owned subsidiary of WMI, guarantees all of the obligations under the $3.5 billion revolving credit facility. Commercial Paper Program — We have a commercial paper program that enables us to borrow funds for up to 397 days at competitive interest rates. The rates we pay for outstanding borrowings are based on the term of the notes. The commercial paper program is fully supported by our $3.5 billion revolving credit facility. As of March 31, 2024, we had $750 million of outstanding borrowings (net of related discount on issuance) under our commercial paper program. Other Letter of Credit Lines — As of March 31, 2024, we had utilized $846 million of other uncommitted letter of credit lines, with terms maturing through December 2027. Debt Borrowings and Repayments Commercial Paper Program — During the three months ended March 31, 2024, we made cash repayments of $4.5 billion, which were partially offset by $4.4 billion of cash borrowings (net of related discount on issuance). Financing Leases and Other — The decrease in our financing leases and other debt obligations during the three months ended March 31, 2024 is due to $42 million of cash repayments at debt maturity, partially offset by an increase of $25 million primarily related to non-cash financing leases.

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