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Debt
 9 Months Ended
Sep. 30, 2025
Debt Disclosure [Abstract]  
DEBT DEBT
The carrying value of our credit facilities, finance leases and long-term debt as of September 30, 2025 and December 31, 2024 is listed in the following table, and is adjusted for unamortized discounts, deferred issuance costs and the unamortized portion of adjustments to fair value recorded in purchase accounting. Original issue discounts and adjustments to fair value recorded in purchase accounting are amortized to interest expense over the term of the applicable instrument using the effective interest method.
  September 30, 2025December 31, 2024
MaturityInterest RatePrincipalAdjustmentsCarrying ValuePrincipalAdjustmentsCarrying Value
Credit facilities:
Uncommitted Credit Facility
Variable$68 $— $68 $— $— $— 
The Credit FacilityVariable147 — 147 514 — 514 
Commercial PaperVariable598 — 598 477 — 477 
Senior notes:
March 20253.200— — — 500 — 500 
November 20250.875350 — 350 350 — 350 
July 20262.900500 (1)499 500 (1)499 
November 20273.375650 (1)649 650 (2)648 
May 20283.950800 (6)794 800 (7)793 
April 20294.875750 (5)745 750 (6)744 
November 20295.000400 (3)397 400 (4)396 
March 20302.300600 (3)597 600 (4)596 
July 20304.750500 (6)494 — — — 
February 20311.450650 (5)645 650 (5)645 
February 20321.750750 (4)746 750 (5)745 
March 20332.375700 (5)695 700 (6)694 
December 20335.000650 (8)642 650 (9)641 
April 20345.000800 (9)791 800 (10)790 
November 20345.200500 (6)494 500 (6)494 
March 20356.086182 (10)172 182 (11)171 
March 20355.150700 (11)689 — — — 
March 20406.200400 (3)397 400 (3)397 
May 20415.700386 (5)381 386 (5)381 
March 20503.050400 (7)393 400 (7)393 
Debentures:
September 20357.400148 (26)122 148 (27)121 
Tax-exempt:
2026 - 2054
3.200 - 4.375
1,378 (9)1,369 1,418 (9)1,409 
Finance leases and other:
2025 - 2063
1.726 - 9.750
400 — 400 315 — 315 
Total Debt$13,407 $(133)13,274 $12,840 $(127)12,713 
Less: current portion(921)(862)
Long-term portion$12,353 $11,851 
Credit Facilities
Uncommitted Credit Facility
In January 2022, we entered into a $200 million unsecured uncommitted revolving credit facility (the Uncommitted Credit Facility). The Uncommitted Credit Facility bears interest at an annual percentage rate to be agreed upon by both parties. Borrowings under the Uncommitted Credit Facility can be used for working capital, letters of credit, and other general corporate purposes. The agreement governing our Uncommitted Credit Facility requires us to comply with certain covenants. The Uncommitted Credit Facility may be terminated by either party at any time. As of September 30, 2025, we had $68 million of borrowings outstanding under our Uncommitted Credit Facility. As of December 31, 2024, we had no borrowings outstanding under our Uncommitted Credit Facility.
The Credit Facility
In July 2024, we and our subsidiary, USE Canada Holdings, Inc. (the Canadian Borrower), entered into the Second Amended and Restated Credit Agreement (the Credit Facility), which amended and restated the unsecured revolving credit facility we entered into in August 2021. The total outstanding principal amount that we may borrow under the Credit Facility may not exceed the current aggregate lenders' commitments of $3.5 billion, and borrowings under the Credit Facility mature in July 2029. We have the right to request two one-year extensions of the maturity date, but none of the lenders are committed to participate in such extensions. The Credit Facility also includes a feature that allows us to increase availability, at our option, by an aggregate amount of up to $1.0 billion through increased commitments from existing lenders or the addition of new lenders.
All loans to the Canadian Borrower and all loans denominated in Canadian dollars cannot exceed $1.0 billion (the Canadian Sublimit). The Canadian Sublimit is part of, and not in addition to, the aggregate commitments under the Credit Facility.
Borrowings under the Credit Facility in United States dollars bear interest at a Base Rate, a daily floating SOFR or a term SOFR, plus a current applicable margin of 0.805% based on our Debt Ratings (all as defined in the Credit Facility agreement). Canadian dollar-denominated loans bear interest based on the Canadian Prime Rate or the Canadian Dollar Offered Rate, plus a current applicable margin of 0.805% based on our Debt Ratings. As of September 30, 2025 and December 31, 2024, C$204 million and C$232 million, respectively, were outstanding against the Canadian Sublimit.
The Credit Facility is subject to facility fees based on applicable rates defined in the Credit Facility agreement and the aggregate commitment, regardless of usage. The Credit Facility can be used for working capital, capital expenditures, acquisitions, letters of credit and other general corporate purposes. The Credit Facility agreement requires us to comply with financial and other covenants. We may pay dividends and repurchase common stock if we are in compliance with these covenants.
We had $147 million and $514 million of borrowings outstanding under the Credit Facility as of September 30, 2025 and December 31, 2024, respectively. We had $320 million and $317 million of letters of credit outstanding under the Credit Facility as of September 30, 2025 and December 31, 2024, respectively. We also had $598 million and $477 million of principal borrowings outstanding (net of related discount on issuance) under our commercial paper program as of September 30, 2025 and December 31, 2024, respectively. As a result, availability under our Credit Facility was $2.4 billion and $2.2 billion as of September 30, 2025 and December 31, 2024, respectively.
Commercial Paper Program
In May 2022, we entered into a commercial paper program for the issuance and sale of unsecured commercial paper in an aggregate principal amount not to exceed $500 million outstanding at any one time (the Commercial Paper Cap). In August 2022, the Commercial Paper Cap was increased to $1.0 billion, and in October 2023, was increased to $1.5 billion. The weighted average interest rate for borrowings outstanding as of September 30, 2025 is 4.249% with a weighted average maturity of approximately 8 days. The weighted average interest rate for borrowings outstanding as of December 31, 2024 is 4.646% with a weighted average maturity of approximately 18 days.
We had $598 million and $477 million principal value of commercial paper issued and outstanding under the program as of September 30, 2025 and December 31, 2024, respectively. In the event of a failed re-borrowing, we currently have availability under our Credit Facility to fund amounts currently borrowed under the commercial paper program until they are re-borrowed successfully. Accordingly, we have classified these borrowings as long-term in our consolidated balance sheets as of September 30, 2025 and December 31, 2024, respectively.
Senior Notes and Debentures
In June 2024, we issued $400 million of 5.000% senior notes due 2029 and $500 million of 5.200% senior notes due 2034. We used the proceeds from the June 2024 notes issuance for general corporate purposes, including the repayment of a portion of amounts outstanding under the Commercial Paper Program and the Credit Facility; and repayment of the remaining amount outstanding under the Uncommitted Credit Facility and certain debt obligations.
In March 2025, we issued $500 million of 4.750% senior notes due 2030 and $700 million of 5.150% senior notes due 2035. We used the proceeds from the March 2025 notes issuance for general corporate purposes, including the repayment of a portion of amounts outstanding on our Credit Facility and a portion of outstanding borrowings under the Commercial Paper Program.
Our senior notes and debentures are general unsecured and unsubordinated obligations and rank equally with our other unsecured obligations.
Tax-Exempt Financings
As of both September 30, 2025 and December 31, 2024, we had $1.4 billion of tax-exempt financings outstanding, with maturities ranging from 2026 to 2054 for both periods.
In June 2024, the Mission Economic Development Corporation issued, for our benefit, $50 million in principal amount of Solid Waste Disposal Revenue Bonds. The proceeds from the issuance, after deferred issuance costs, were used to fund the acquisition, construction, improvement, installation, and/or equipping of certain solid waste disposal facilities located within Texas.
In March 2024, the California Municipal Finance Authority issued, for our benefit, $100 million in principal amount of Solid Waste Disposal Revenue Bonds. The proceeds from the issuance, after deferred issuance costs, were used to fund the acquisition, construction, improvement, installation, and/or equipping of certain solid waste disposal facilities located within California.
We have $250 million of tax-exempt financings that have an initial remarketing period of 10 years. Our remaining tax-exempt financings are remarketed either quarterly or semiannually by remarketing agents to effectively maintain a variable yield. The holders of the bonds can put them back to the remarketing agents at the end of each interest period. If the remarketing agents are unable to remarket our bonds, the remarketing agents can put the bonds to us. In the event of a failed remarketing, we currently have availability under our Credit Facility to fund the repurchase of these bonds until they are remarketed successfully. Accordingly, we classified these borrowings as long-term in our consolidated balance sheets as of September 30, 2025 and December 31, 2024.
Finance Leases and Other
As of September 30, 2025 and December 31, 2024, we had finance leases and other liabilities of $400 million and $315 million, respectively, with maturities ranging from 2025 to 2063 for both periods.
In our unaudited consolidated balance sheet as of September 30, 2025, finance leases and other included $120 million related to the construction of an office building located in Phoenix, Arizona, which has been accounted for as a financing obligation. The amount is recorded within long-term debt, net of current maturities.