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Debt - Components (Detail) $ in Millions, $ in Millions | Mar. 31, 2024 USD ($) | Mar. 31, 2024 CAD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2023 CAD ($)
--- | --- | --- | --- | ---
Debt |  |  |  |
Debt | $ 16,098 |  | $ 16,229 |
Debt issuance costs, discounts and other | (118) |  | (123) |
Current portion of long-term debt | 336 |  | 334 |
Long-term debt, less current portion | 15,762 |  | 15,895 |
Commercial Paper Program [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 750 |  | $ 860 |
Weighted average interest rate | 5.50% | 5.50% | 5.60% | 5.60%
Senior Notes, Aggregate [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 11,376 |  | $ 11,376 |
Weighted average interest rate | 3.70% | 3.70% | 3.70% | 3.70%
Senior Notes, Aggregate [Member] | Minimum [Member] |  |  |  |
Debt |  |  |  |
Interest rate (as a percent) | 0.75% | 0.75% | 0.75% | 0.75%
Senior Notes, Aggregate [Member] | Maximum [Member] |  |  |  |
Debt |  |  |  |
Interest rate (as a percent) | 7.75% | 7.75% | 7.75% | 7.75%
Canadian Senior Notes [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 369 | $ 500 | $ 378 | $ 500
Interest rate (as a percent) | 2.60% | 2.60% | 2.60% | 2.60%
Tax Exempt Bonds [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 2,883 |  | $ 2,883 |
Weighted average interest rate | 3.20% | 3.20% | 3.30% | 3.30%
Tax Exempt Bonds [Member] | Minimum [Member] |  |  |  |
Debt |  |  |  |
Interest rate (as a percent) | 0.55% | 0.55% | 0.55% | 0.55%
Tax Exempt Bonds [Member] | Maximum [Member] |  |  |  |
Debt |  |  |  |
Interest rate (as a percent) | 5.00% | 5.00% | 5.00% | 5.00%
Financing leases and other [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 838 |  | $ 855 |
Weighted average interest rate | 4.90% | 4.90% | 5.00% | 5.00%

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