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v3.25.2

Debt - Components (Detail) $ in Millions, $ in Millions | Jun. 30, 2025 USD ($) | Jun. 30, 2025 CAD ($) | Dec. 31, 2024 USD ($) | Dec. 31, 2024 CAD ($)
--- | --- | --- | --- | ---
Debt |  |  |  |
Debt issuance costs, discounts and other | $ (170) |  | $ (179) |
Debt | 24,020 |  | 23,900 |
Current portion of long-term debt | 964 |  | 1,359 |
Long-term debt, less current portion | 23,056 |  | 22,541 |
Commercial Paper Program [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 1,545 |  | $ 1,250 |
Weighted average interest rate | 4.60% | 4.60% | 4.70% | 4.70%
Senior Notes, Aggregate [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 17,998 |  | $ 18,419 |
Weighted average interest rate | 4.20% | 4.20% |  |
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 | $ 367 | $ 500 | $ 348 | $ 500
Interest rate (as a percent) | 2.60% | 2.60% | 2.60% | 2.60%
Tax Exempt Bonds [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 3,003 |  | $ 2,873 |
Weighted average interest rate | 3.70% | 3.70% |  |
Tax Exempt Bonds [Member] | Minimum [Member] |  |  |  |
Debt |  |  |  |
Interest rate (as a percent) | 0.70% | 0.70% | 0.70% | 0.70%
Tax Exempt Bonds [Member] | Maximum [Member] |  |  |  |
Debt |  |  |  |
Interest rate (as a percent) | 4.60% | 4.60% | 4.60% | 4.60%
Financing leases and other [Member] |  |  |  |
Debt |  |  |  |
Debt | $ 1,277 |  | $ 1,189 |
Weighted average interest rate | 4.90% | 4.90% |  |

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