The following table summarizes the major components of debt as of each balance sheet date (in millions) and provides the maturities and interest rate ranges of each major category as of March 31, 2022:

(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, 2022, we had approximately $3.0 billion of debt maturing within the next 12 months, including (i) $1.7 billion of short-term borrowings under our commercial paper program (net of related discount on issuance); (ii) $645 million of tax-exempt bonds with term interest rate periods that expire within the next 12 months, which is prior to their scheduled maturities; (iii) $500 million of 2.9% senior notes that mature in September 2022 and (iv) $180 million of other debt with scheduled maturities within the next 12 months, including $71 million of tax-exempt bonds. As of March 31, 2022, we have classified $2.6 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 $435 million of debt maturing in the next 12 months is classified as current obligations.

As of March 31, 2022, we also had $54 million of variable-rate tax-exempt bonds with long-term scheduled maturities supported by letters of credit under our $3.5 billion revolving credit facility. The interest rates on our variable-rate tax-exempt bonds reset on a weekly basis through a remarketing process. All recent tax-exempt bond remarketings have successfully placed Company bonds with investors at market-driven rates and we currently expect future remarketings to be successful. However, if the remarketing agent is unable to remarket our bonds, the remarketing agent can put the bonds to us. In the event of a failed remarketing, we have the availability under our $3.5 billion revolving credit facility to fund these bonds until they are remarketed successfully. Accordingly, we have classified the $54 million of variable-rate tax-exempt bonds with maturities of more than one year as long-term in our Condensed Consolidated Balance Sheet as of March 31, 2022.

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 November 2024, provides us with credit capacity to be used for cash borrowings, to support letters of credit and to support our commercial paper program. The rates we pay for outstanding U.S. or Canadian loans are generally based on LIBOR (or a LIBOR successor rate, if applicable, as provided for in the underlying credit agreement) or CDOR, respectively, plus a spread depending on the Company’s debt rating assigned by Moody’s Investors Service, Inc. and Standard and Poor’s Global Ratings. As of March 31, 2022, we had no outstanding borrowings under this facility. We had $166 million of letters of credit issued and $1.7 billion 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 $1.6 billion as of March 31, 2022. 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, 2022, we had $1.7 billion of outstanding borrowings (net of related discount on issuance) under our commercial paper program.

Other Letter of Credit Lines — As of March 31, 2022, we had utilized $769 million of other uncommitted letter of credit lines, with terms maturing through April 2023.

Debt Borrowings and Repayments

Commercial Paper Program — During the three months ended March 31, 2022, we made cash repayments of $2.5 billion, which were partially offset by $2.4 billion of cash borrowings (net of related discount on issuance).

Financing Leases and Other — The increase in our financing leases and other debt obligations during the three months ended March 31, 2022 is primarily related to our new federal low-income housing investment discussed in Note 4, which increased our debt obligations by $183 million. The increase in our debt obligations was partially offset by $19 million of cash repayments of debt at maturity.