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Debt and Capital Structure - Schedule of Long-Term Debt (Detail) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Disclosure of detailed information about borrowings [line items] |  |
Debt Premiums (Discounts), Net, and Transaction Costs | $ 64 | $ 80
Long-Term Debt | 7,534 | 7,108
Less: Current Portion | 192 | 0
Long-Term Debt | 7,342 | 7,108
Long-Term Debt |  |
Disclosure of detailed information about borrowings [line items] |  |
Total Debt Principal, (CAD equivalent) | 7,470 | 7,028
Long-Term Debt | Revolving Term Debt |  |
Disclosure of detailed information about borrowings [line items] |  |
Committed Credit Facility | 0 | 0
Long-Term Debt | U.S. Dollar Denominated Unsecured Notes |  |
Disclosure of detailed information about borrowings [line items] |  |
Total Debt Principal, (CAD equivalent) | 5,470 | 5,028
Long-Term Debt | Canadian Dollar Unsecured Notes |  |
Disclosure of detailed information about borrowings [line items] |  |
Total Debt Principal, (CAD equivalent) | $ 2,000 | $ 2,000

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