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Debt - Components (Detail) $ in Millions, $ in Millions | Dec. 31, 2020 USD ($) | Dec. 31, 2020 CAD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | ---
Debt |  |  |
Debt | $ 13,810 |  | $ 13,498
Debt issuance costs, discounts and other | (85) |  | (85)
Current portion of long-term debt | 551 |  | 218
Long-term debt, less current portion | 13,259 |  | 13,280
Commercial Paper Program [Member] |  |  |
Debt |  |  |
Debt | 1,814 |  |
Current portion of long-term debt | $ 1,800 |  |
Weighted average interest rate | 0.40% | 0.40% |
Senior Notes, Aggregate [Member] |  |  |
Debt |  |  |
Debt | $ 8,465 |  | $ 9,965
Weighted average interest rate | 3.30% | 3.30% | 3.90%
Canadian Senior Notes [Member] |  |  |
Debt |  |  |
Debt | $ 393 | $ 500 | $ 385
Interest rate (as a percent) | 2.60% | 2.60% |
Tax Exempt Bonds [Member] |  |  |
Debt |  |  |
Debt | $ 2,571 |  | $ 2,523
Current portion of long-term debt | $ 127 |  |
Weighted average interest rate | 1.70% | 1.70% | 2.30%
Financing leases and other [Member] |  |  |
Debt |  |  |
Debt | $ 652 |  | $ 710
Current portion of long-term debt | $ 242 |  |
Weighted average interest rate | 4.60% | 4.60% |
Minimum [Member] | Senior Notes, Aggregate [Member] |  |  |
Debt |  |  |
Interest rate (as a percent) | 0.75% | 0.75% |
Minimum [Member] | Tax Exempt Bonds [Member] |  |  |
Debt |  |  |
Interest rate (as a percent) | 0.10% | 0.10% |
Maximum [Member] | Senior Notes, Aggregate [Member] |  |  |
Debt |  |  |
Interest rate (as a percent) | 7.75% | 7.75% |
Maximum [Member] | Tax Exempt Bonds [Member] |  |  |
Debt |  |  |
Interest rate (as a percent) | 4.30% | 4.30% |

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