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Miscellaneous financial information - Summary of Reserves and Charges (Details) - Employee Severance $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2025 CAD ($)	Sep. 30, 2025 CAD ($)
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Beginning Balance		$ 0
Additions/adjustments	$ 330	330
Payments made		0
Restructuring Reserve, Ending Balance	330	330
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	330	330
Additions/adjustments	$ 330	330
Payments made		$ 0

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- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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