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 December 31:

(a)	Excluding our landfill financing leases, the maturities of our financing leases and other debt obligations extend through 2059.

Debt Classification

As of December 31, 2021, we had $3.1 billion of debt maturing within the next 12 months, including (i) $1.8 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 2.90% senior notes that mature in September 2022 and (iv) $170 million of other debt with scheduled maturities within the next 12 months, including $71 million of tax-exempt bonds. As of December 31, 2021, we have classified $2.4 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 $708 million of debt maturing in the next 12 months is classified as current obligations.

As of December 31, 2021, 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 Consolidated Balance Sheet as of December 31, 2021.

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 agreement provides the Company with two one-year extension options. Waste Management of Canada Corporation and WM Quebec Inc., each an indirect wholly-owned subsidiary of WMI, are borrowers under the $3.5 billion revolving credit facility, and the agreement permits borrowing in Canadian dollars up to the U.S. dollar equivalent of $375 million, with such borrowings to be repaid in Canadian dollars. WM Holdings, a wholly-owned subsidiary of WMI, guarantees all the obligations under the $3.5 billion revolving credit facility.

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 and Standard and Poor’s. As of December 31, 2021, we had no outstanding borrowings under this facility. We had $167 million of letters of credit issued and $1.8 billion of outstanding borrowings (net of related discount on issuance) under our commercial paper program, both supported by this facility, leaving unused and available credit capacity of $1.5 billion as of December 31, 2021.

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 December 31, 2021, we had $1.8 billion of outstanding borrowings (net of related discount on issuance) under our commercial paper program.

Other Letter of Credit Lines — As of December 31, 2021, we had utilized $764 million of other uncommitted letter of credit lines with terms maturing through April 2023.

Debt Borrowings and Repayments

Commercial Paper Program — During the year ended December 31, 2021 we made cash repayments of $6.9 billion, which were partially offset by $6.8 billion of cash borrowings (net of related discount on issuance).

Senior Notes — In May 2021, WMI issued $950 million of senior notes consisting of $475 million of 2.00% senior notes due June 1, 2029 and $475 million of 2.95% senior notes due June 1, 2041. The net proceeds from these debt issuances were $942 million, all of which were used, along with available cash on hand, to retire $1.3 billion of certain high-coupon senior notes. The cash paid included the principal amount of the debt retired, $211 million of related premiums and other third-party costs, and $15 million of accrued interest.

During the second quarter of 2021, we recognized a $220 million loss on early extinguishment of debt in our Consolidated Statement of Operations related to the tender offer, including $211 million of premiums and other third-party costs and $9 million primarily related to unamortized discounts and debt issuance costs. We also recognized $6 million of charges to interest expense for the write-off of cash flow hedges associated with the tendered notes, which was previously being amortized to interest expense through the notes’ stated maturities. The following table summarizes the principal amount of senior notes redeemed within each series in order of acceptance priority level (in millions):


	Principal
	Outstanding		Notes Tendered
Description	Prior to Tender		and Redeemed
6.125% WMI senior notes due 2039	$	252	$	6
7.75% WMI senior notes due 2032		153		9
7.375% WMI senior notes due 2029		81		—
4.15% WMI senior notes due 2049		1,000		316
4.10% WMI senior notes due 2045		750		334
3.90% WMI senior notes due 2035		450		153
7.00% WMI senior notes due 2028		330		73
7.10% WM Holdings senior notes due 2026		249		26
3.50% WMI senior notes due 2024		350		194
3.125% WMI senior notes due 2025		600		178
3.15% WMI senior notes due 2027		750		—
2.90% WMI senior notes due 2022		500		—
2.40% WMI senior notes due 2023		500		—
Total	$	5,965		1,289

Tax-Exempt Bonds — We issued $175 million of new tax-exempt bonds in 2021. The proceeds from the issuance of these bonds were deposited directly into a restricted trust fund and may only be used for the specific purpose for which the money was raised, which is generally to finance expenditures for solid waste disposal facility and material recovery facility construction and development. In 2021, we also elected to refund and reissue $50 million of tax-exempt bonds and we repaid $127 million of our tax-exempt bonds with available cash at their scheduled maturities.

Financing Leases and Other — The decrease during 2021 is due to $115 million of cash repayments of debt at maturity, partially offset by an increase of $30 million primarily associated with non-cash financing leases.

Scheduled Debt Payments

Principal payments of our debt for the next five years and thereafter, based on scheduled maturities are as follows: $2,449 million in 2022, $651 million in 2023, $249 million in 2024, $1,278 million in 2025, $677 million in 2026 and $8,275 million thereafter. Our recorded debt and financing lease obligations include non-cash adjustments associated with

debt issuance costs, discounts and fair value adjustments attributable to terminated interest rate derivatives, which have been excluded from these amounts because they will not result in cash payments. See Note 7 below for further discussion of our financing lease arrangements.

Secured Debt

Our debt balances are generally unsecured, except for financing leases and the notes payable associated with our investments in low-income housing properties. See Notes 8 and 18 for additional information related to these investments.

Debt Covenants

The terms of certain of our financing arrangements require that we comply with financial and other covenants. Our most restrictive financial covenant is the one contained in our $3.5 billion revolving credit facility, which sets forth a maximum total debt to consolidated earnings before interest, taxes, depreciation and amortization ratio (the “Leverage Ratio”). This covenant requires that the Leverage Ratio for the preceding four fiscal quarters will not be more than 3.75 to 1, provided that if an acquisition permitted under the $3.5 billion revolving credit facility involving aggregate consideration in excess of $200 million occurs during the fiscal quarter, the Company shall have the right to increase the Leverage Ratio to 4.25 to 1 during such fiscal quarter and for the following three fiscal quarters (the “Elevated Leverage Ratio Period”). There shall be no more than two Elevated Leverage Ratio Periods during the term of the $3.5 billion revolving credit facility, and the Leverage Ratio must return to 3.75 to 1 for at least one fiscal quarter between Elevated Leverage Ratio Periods. The Company did not elect to increase the Leverage Ratio for an Elevated Leverage Ratio Period following the acquisition of Advanced Disposal. The calculation of all components used in the Leverage Ratio covenant are as defined in the $3.5 billion revolving credit facility.

Our $3.5 billion revolving credit facility, senior notes and other financing arrangements also contain certain restrictions on the ability of the Company’s subsidiaries to incur additional indebtedness as well as restrictions on the ability of the Company and its subsidiaries to, among other things, incur liens; engage in sale-leaseback transactions and engage in mergers and consolidations. We monitor our compliance with these restrictions, but do not believe that they significantly impact our ability to enter into investing or financing arrangements typical for our business. As of December 31, 2021 and 2020, we were in compliance with all covenants and restrictions under our financing arrangements that may have a material effect on our Consolidated Financial Statements.