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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.