3. Debt

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 September 30, 2017:


	September 30,		December 31,
	2017		2016
$2.25 billion revolving credit facility, maturing July 2020 (weighted average interest rate of 1.9% as of December 31, 2016)	$	—	$	426
Commercial paper program (weighted average interest rate of 1.4% as of September 30, 2017)		502		—
Other letter of credit facilities, maturing through December 2018		—		—
Canadian term loan and revolving credit facility, maturing March 2019 (weighted average effective interest rate of 2.5% as of September 30, 2017 and 2.1% as of December 31, 2016)		143		239
Senior notes maturing through 2045, interest rates ranging from 2.4% to 7.75% (weighted average interest rate of 4.6% as of September 30, 2017 and December 31, 2016)		6,033		6,033
Tax-exempt bonds, maturing through 2045, fixed and variable interest rates ranging from 1.0% to 5.7% (weighted average interest rate of 1.9% as of September 30, 2017 and 1.8% as of December 31, 2016)		2,339		2,304
Capital leases and other, maturing through 2055, interest rates up to 12%		328		308
		9,345		9,310
Current portion of long-term debt		850		417
	$	8,495	$	8,893

Debt Classification

As of September 30, 2017, we had $1,821 million of debt maturing within the next 12 months, including (i) $590 million of 6.1% senior notes that mature in March 2018; (ii) $551 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) $502 million of short-term borrowings under our commercial paper program and (iv) $178 million of other debt with scheduled maturities within the next 12 months, including $119 million of tax-exempt bonds. As of September 30, 2017, we have classified $971 million of debt 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 long-term U.S. revolving credit facility (“$2.25 billion revolving credit facility”), as discussed below. The remaining $850 million is classified as current obligations.

As of September 30, 2017, we also have $471 million of variable-rate tax-exempt bonds that are supported by letters of credit. The interest rates on our variable-rate tax-exempt bonds are generally reset on either a daily or 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 intent and ability to refinance these bonds on a long-term basis as supported by the forecasted available capacity under our $2.25 billion revolving credit facility, as discussed below. Accordingly, we have also classified these borrowings as long-term in our Condensed Consolidated Balance Sheet as of September 30, 2017.

Access to and Utilization of Credit Facilities and Commercial Paper Program

$2.25 Billion Revolving Credit Facility — Our $2.25 billion revolving credit facility maturing in July 2020 provides us with credit capacity to be used for either cash borrowings or to support letters of credit or commercial paper. 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. As of September 30, 2017, we had no outstanding borrowings under this facility. We had $777 million of letters of credit issued and $502 million of outstanding borrowings under our commercial paper program, both supported by this facility, leaving unused and available credit capacity of $971 million as of September 30, 2017.

Commercial Paper Program — In August 2016, we entered into a $1.5 billion commercial paper program that enables us to borrow funds for up to 397 days at competitive interest rates. The commercial paper program is fully supported by our $2.25 billion revolving credit facility.

Canadian Term Loan and Revolving Credit Facility — We have a Canadian credit agreement (which includes a term loan and revolving credit facility) that matures in March 2019. This agreement provides the Company (i) C$50 million of revolving credit capacity, which can be used for borrowings or letters of credit, and (ii) C$460 million of non-revolving term credit that is prepayable without penalty and principal amounts repaid may not be reborrowed. As of September 30, 2017, we had no borrowings or letters of credit outstanding under the Canadian revolving credit facility.

Other Letter of Credit Facilities — As of September 30, 2017, we had utilized $508 million of other letter of credit facilities, which are both committed and uncommitted, with terms maturing through December 2018.

Debt Borrowings and Repayments

$2.25 Billion Revolving Credit Facility — During the nine months ended September 30, 2017, we had net repayments of $426 million under our $2.25 billion revolving credit facility, all of which was replaced with net borrowings under our commercial paper program.

Commercial Paper Program — During the nine months ended September 30, 2017, we had net borrowings of $501 million (net of the related discount on issuance) for general corporate purposes.

Canadian Term Loan — During the nine months ended September 30, 2017, we repaid C$142 million, or $108 million, of net advances under our Canadian term loan with available cash. The remaining change in the carrying value of outstanding borrowings under our Canadian term loan is due to foreign currency translation.

Tax-Exempt Bonds — During the nine months ended September 30, 2017, we repaid $40 million of our tax-exempt bonds with available cash at their scheduled maturities. We issued $75 million of tax-exempt bonds in August 2017. The proceeds from the issuance of these bonds were deposited directly into a trust fund and may only be used for the specific purpose for which the money was raised, which is generally to finance expenditures for landfill and solid waste disposal facility construction and development. Accordingly, the restricted funds provided by these financing activities have not been included in new borrowings in our Condensed Consolidated Statement of Cash Flows.

Capital Leases and Other — During the nine months ended September 30, 2017, we had net repayments of $53 million of other debt paid with available cash. We also entered into $73 million in new capital leases during the nine months ended September 30, 2017 to support new business opportunities.

Cross-Currency Swaps

In March 2016, our Canadian subsidiaries repaid C$370 million of intercompany debt to WM Holdings with proceeds from our Canadian term loan. Concurrent with the repayment of the intercompany debt, we terminated the related cross-currency swaps and received $67 million in cash. The cash received from our termination of these swaps was classified as a change in other current assets and other assets within net cash provided by operating activities in the Condensed Consolidated Statement of Cash Flows. In addition, we recognized $8 million of expense associated with the termination of these swaps during the first quarter of 2016, which was included in other, net in the Condensed Consolidated Statement of Operations.