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Finance Costs, Net - Schedule of Finance Costs (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Finance Costs [Abstract] |  |  |
Interest Expense – Short-Term Borrowings and Long-Term Debt |  | $ 307 | $ 362
Net Premium (Discount) on Redemption of Long-Term Debt |  | 0 | (84)
Interest Expense – Lease Liabilities (Note 17) |  | 162 | 161
Unwinding of Discount on Decommissioning Liabilities (Note 24) |  | 225 | 220
Other |  | 35 | 32
Capitalized Interest |  | (45) | (20)
Finance Costs |  | 684 | 671
Interest Income |  | (170) | (133)
Finance costs | [1] | $ 514 | $ 538
[1] | (1)Revised presentation as of January 1, 2024. See Note 4.

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