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Debt - Components (Detail) $ in Millions, $ in Millions | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 CAD ($)
--- | --- | --- | --- | ---
Debt |  |  |  |
Debt | $ 14,984 |  | $ 13,405 |
Debt issuance costs, discounts and other | (88) |  | (80) |
Current portion of long-term debt | 414 |  | 708 |
Long-term debt, less current portion | 14,570 |  | 12,697 |
Commercial Paper Program [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 1,730 |  | $ 1,778 |
Weighted average interest rate | 4.90% | 4.90% | 0.40% | 0.40%
Term Loan maturing May 2024 [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 1,000 |  |  |
Effective interest rate (as a percent) | 5.10% | 5.10% |  |
Senior Notes, Aggregate [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 8,626 |  | $ 8,126 |
Weighted average interest rate | 3.20% | 3.20% | 3.10% | 3.10%
Senior Notes, Aggregate [Member] | Minimum [Member] |  |  |  |
Debt |  |  |  |
Interest rate (as a percent) | 0.75% | 0.75% |  |
Senior Notes, Aggregate [Member] | Maximum [Member] |  |  |  |
Debt |  |  |  |
Interest rate (as a percent) | 7.75% | 7.75% |  |
Canadian Senior Notes [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 369 | $ 500 | $ 395 | $ 500
Interest rate (as a percent) | 2.60% | 2.60% | 2.60% | 2.60%
Tax Exempt Bonds [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 2,648 |  | $ 2,619 |
Weighted average interest rate | 2.70% | 2.70% | 1.40% | 1.40%
Tax Exempt Bonds [Member] | Minimum [Member] |  |  |  |
Debt |  |  |  |
Interest rate (as a percent) | 0.40% | 0.40% |  |
Tax Exempt Bonds [Member] | Maximum [Member] |  |  |  |
Debt |  |  |  |
Interest rate (as a percent) | 4.40% | 4.40% |  |
Financing leases and other [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 699 |  | $ 567 |
Weighted average interest rate | 4.70% | 4.70% | 4.50% | 4.50%

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