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Debt and Derivatives - Components (Detail) $ in Millions, $ in Millions | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CAD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 CAD ($)
--- | --- | --- | --- | ---
Debt |  |  |  |
Debt | $ 16,229 |  | $ 14,984 |
Debt issuance costs, discounts and other | (123) |  | (88) |
Current portion of long-term debt | 334 |  | 414 |
Long-term debt, less current portion | 15,895 |  | 14,570 |
Commercial Paper Program [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 860 |  | $ 1,730 |
Weighted average interest rate | 5.60% | 5.60% | 4.90% | 4.90%
Senior Notes, Aggregate [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 11,376 |  | $ 8,626 |
Weighted average interest rate | 3.70% | 3.70% | 3.20% | 3.20%
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% |  |
Term Loan [Member] |  |  |  |
Debt |  |  |  |
Debt |  |  | $ 1,000 |
Effective interest rate (as a percent) |  |  | 5.10% | 5.10%
Canadian Senior Notes [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 378 | $ 500 | $ 369 | $ 500
Interest rate (as a percent) | 2.60% | 2.60% | 2.60% | 2.60%
Tax Exempt Bonds [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 2,883 |  | $ 2,648 |
Weighted average interest rate | 3.30% | 3.30% | 2.70% | 2.70%
Tax Exempt Bonds [Member] | Minimum [Member] |  |  |  |
Debt |  |  |  |
Interest rate (as a percent) | 0.55% | 0.55% |  |
Tax Exempt Bonds [Member] | Maximum [Member] |  |  |  |
Debt |  |  |  |
Interest rate (as a percent) | 5.00% | 5.00% |  |
Financing leases and other [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 855 |  | $ 699 |
Weighted average interest rate | 5.00% | 5.00% | 4.70% | 4.70%

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