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Debt (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt |
Components of 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 December 31:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2020 |  | 2019
Commercial paper program (weighted average interest rate of 0.4% as of December 31, 2020) | ​ | $ | 1,814 | ​ | $ | —
Senior notes, maturing through 2050, interest rates ranging from 0.75% to 7.75% (weighted average interest rate of 3.3% as of December 31, 2020 and 3.9% as of December 31, 2019) | ​ |  | 8,465 | ​ |  | 9,965
Canadian senior notes, C$500 million maturing September 2026, interest rate of 2.6% | ​ | ​ | 393 | ​ | ​ | 385
Tax-exempt bonds, maturing through 2048, fixed and variable interest rates ranging from 0.1% to 4.3% (weighted average interest rate of 1.7% as of December 31, 2020 and 2.3% as of December 31, 2019) | ​ |  | 2,571 | ​ |  | 2,523
Financing leases and other, maturing through 2085, weighted average interest rate of 4.6% (a) | ​ |  | 652 | ​ |  | 710
Debt issuance costs, discounts and other | ​ |  | (85) | ​ |  | (85)
​ | ​ |  | 13,810 | ​ |  | 13,498
Current portion of long-term debt | ​ |  | 551 | ​ |  | 218
​ | ​ | $ | 13,259 | ​ | $ | 13,280
(a) | Excluding our landfill financing leases, the maturities of our financing leases and other debt obligations extend through 2059.

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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