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Long-term debt | 12 Months Ended
--- | ---
Dec. 31, 2019
Noncurrent Liabilities [Abstract] |
Long-term debt | 13. Long-term debt
|  |  | 2019 |  |  | 2018
Unsecured debentures |  |  |  |  |
| Series D - 5.67% debentures due September 2, 2019 | $ | - |  | $ | 499,599
| Series E - 3.75% debentures due November 14, 2022 |  | 399,152 |  |  | 398,873
| Series F - 5.09% debentures due November 14, 2042 |  | 99,302 |  |  | 99,286
| Series G - 4.19% debentures due June 24, 2024 |  | 498,264 |  |  | 497,913
|  |  | 996,718 |  |  | 1,495,671
Less current portion |  | - |  |  | (499,599)
Total | $ | 996,718 |  | $ | 996,072
Cameco has a $1,00 0,000,000 unsecured revolving credit facility that is available until November 1, 2023. Upon mutual agreement, the facility can be extended for an additional year on the anniversary date. In addition to direct borrowings under the facility, up to $100,000,000 can be used for the issuance of letters of credit and, to the extent necessary, it may be used to provide liquidity support for the Company’s commercial paper program. The agreement also provides the ability to increase the rev olving credit facility above $1,00 0,000,000 by increments no less than $50,000,000, to a total of $1,2 50,000,000. The facility ranks equally with all of Cameco’s other senior debt. As of December 31, 2019 and 2018, there were no amounts outstanding u nder this facility. Cameco has $1,719,120,000 (2018 - $1,716,473,000) in letter of credit facilities. Outstanding and committed letters of credit at December 31, 2019 amou nted to $1,528,603,000 (2018 - $1,572,984,000), the majority of which relat e to future decommissioning and reclamation liabilities (note 15). Cameco is bound by a covenant in its revolving credit facility. The covenant requires a funded debt to tangible net worth ratio equal to or less than 1:1. Non-compliance with this coven ant could result in accelerated payment and termination of the revolving credi t facility. At December 31, 2019, Cameco was in compliance with the covenant and does not expect its operating and investing activities in 2020 to be constrained by it. The Company has arranged for standby product loan facilities with three different counterpa rties. The arrangements allow it to borrow up to 1.2 million kgU of UF6 conversion services over the period 2020 to 2022 with repayment in kind up to March 31, 2023. Un der the loan facilities, standby fees of up to 1% are payable based on the market value of the facilities and interest is payable on the market value of any amounts drawn at rates ranging from 0.5% to 2.0%.
The table below represents currently scheduled maturities of long-term debt:
| 2020 | 2021 | 2022 | 2023 | 2024 | Thereafter |  | Total
$ | - | - | 399,152 | - | 498,264 | 99,302 | $ | 996,718

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- Definition The disclosure of debt instruments. [Refer: Debt instruments issued; Debt instruments held] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2019-01-01 -Paragraph 10 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_10_e&doctype=Standard -URIDate 2019-03-27 + Details
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