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Debt (Tables) | 3 Months Ended
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Mar. 31, 2022
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 March 31, 2022:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | March 31, | ​ | December 31,
​ |  | 2022 |  | 2021
Commercial paper program (weighted average interest rate of 0.5% as of March 31, 2022 and 0.4% as of December 31, 2021) | ​ | $ | 1,689 | ​ | $ | 1,778
Senior notes, maturing through 2050, interest rates ranging from 0.75% to 7.75% (weighted average interest rate of 3.1% as of March 31, 2022 and December 31, 2021) | ​ | ​ | 8,126 | ​ | ​ | 8,126
Canadian senior notes, C$500 million maturing September 2026, interest rate of 2.6% | ​ |  | 400 | ​ |  | 395
Tax-exempt bonds, maturing through 2048, fixed and variable interest rates ranging from 0.3% to 4.3% (weighted average interest rate of 1.5% as of March 31, 2022 and 1.4% as of December 31, 2021) | ​ |  | 2,619 | ​ |  | 2,619
Financing leases and other, maturing through 2085, weighted average interest rate of 4.8% as of March 31, 2022 and 4.5% as of December 31, 2021 (a) | ​ |  | 731 | ​ |  | 567
Debt issuance costs, discounts and other | ​ |  | (78) | ​ |  | (80)
​ | ​ |  | 13,487 | ​ |  | 13,405
Current portion of long-term debt | ​ |  | 435 | ​ |  | 708
​ | ​ | $ | 13,052 | ​ | $ | 12,697
(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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