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Debt (Tables) | 12 Months Ended
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Dec. 31, 2019
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:
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2019 |  | 2018
Revolving credit facility (weighted average interest rate of 3.1% as of December 31, 2018) | ​ | $ | — | ​ | $ | 11
Commercial paper program (weighted average interest rate of 2.9% as of December 31, 2018) | ​ | ​ | — | ​ | ​ | 990
Senior notes, maturing through 2049, interest rates ranging from 2.4% to 7.75% (weighted average interest rate of 3.9% as of December 31, 2019 and 4.3% as of December 31, 2018) | ​ |  | 9,965 | ​ |  | 6,222
Canadian senior notes, maturing September 2026, interest rate of 2.6% | ​ | ​ | 385 | ​ | ​ | —
Tax-exempt bonds, maturing through 2048, fixed and variable interest rates ranging from 1.35% to 4.3% (weighted average interest rate of 2.3% as of December 31, 2019 and 2.35% as of December 31, 2018) | ​ |  | 2,523 | ​ |  | 2,388
Financing leases and other, maturing through 2071, weighted average interest rate of 4.7% | ​ |  | 710 | ​ |  | 467
Debt issuance costs, discounts and other | ​ |  | (85) | ​ |  | (52)
​ | ​ |  | 13,498 | ​ |  | 10,026
Current portion of long-term debt | ​ |  | 218 | ​ |  | 432
​ | ​ | $ | 13,280 | ​ | $ | 9,594

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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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