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 September 30, 2020.
Access to and Utilization of Credit Facilities and Commercial Paper Program
$3.0 Billion Revolving Credit Facility — On July 28, 2020, we entered into a supplemental $3.0 billion, 364-day, U.S. revolving credit facility (“$3.0 billion revolving credit facility”) maturing July 27, 2021, to be used for general corporate purposes, including funding a portion of the Advanced Disposal acquisition as discussed further in Note 14, and refinancing of indebtedness. The facility provides the Company the option to convert outstanding balances into a term loan maturing no later than the first anniversary of the maturity date, subject to the payment of a fee and notifying the administrative agent at least 15 days prior to the original maturity date. The rates we pay for outstanding loans are generally based on LIBOR, plus a spread depending on the Company’s debt rating assigned by Moody’s Investors Service and Standard and Poor’s. The spread above LIBOR ranges from 1.0% to 1.3%. Based on our current ratings, the rate which we expect to pay will be LIBOR plus 1.225%. As of September 30, 2020, we had 0 outstanding borrowings under this facility. WM Holdings, a wholly-owned subsidiary of WM, guarantees all the obligations under the $3.0 billion revolving credit facility.
$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 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 September 30, 2020, we had 0 outstanding borrowings under this facility. We had $269 million of letters of credit issued and $600 million of outstanding borrowings under our commercial paper program, both supported by this facility, leaving unused and available credit capacity of $2.6 billion as of September 30, 2020. WM Holdings, a wholly-owned subsidiary of WM, 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 September 30, 2020, we had $600 million of outstanding borrowings under our commercial paper program.
Other Letter of Credit Facilities — As of September 30, 2020, we utilized $528 million of other letter of credit facilities, which are both committed and uncommitted, with terms maturing through September 2021.
Debt Borrowings and Repayments
Commercial Paper Program — During the three months ended September 30, 2020, we had net cash borrowings of $597 million (net of related discount on issuance), the proceeds of which were primarily used for the redemption of senior notes discussed further below. We did not have any borrowing or repayment activity under our commercial paper program during the first six months of 2020.
Senior Notes — In June 2020, we repaid $600 million of 4.75% senior notes with available cash at their scheduled maturity.
In May 2019, we issued $4.0 billion of senior notes, $3.0 billion of which were due 2024, 2026, 2029 and 2039 and included a special mandatory redemption feature (the “SMR Notes”). The SMR Notes were issued with the intention of paying a portion of the consideration related to our acquisition of Advanced Disposal, which is discussed further in Notes 8 and 14. Pursuant to the terms of the SMR Notes, we were required to redeem all of such outstanding notes paying debt holders 101% of the aggregate principal amounts of such notes, plus accrued but unpaid interest, as a result of the acquisition not being completed by July 14, 2020. Accordingly, the redemption was completed on July 20, 2020 using