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financial instruments - Fair values Non-derivative (Details) - CAD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Disclosure of detailed information about financial instruments
Long-term debt, excluding leases	$ 25,972	$ 24,735
Measured at amortized cost but fair value disclosed
Disclosure of detailed information about financial instruments
Long-term debt, excluding leases	25,285	23,853
Carrying value
Disclosure of detailed information about financial instruments
Long-term debt, excluding leases	$ 25,972	$ 24,735

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Total long-term borrowings, including the current and non-current portion but excluding the lease liabilities.

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