Accounts receivable, net (Details) - CAD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Accounts Receivable, after Allowance for Credit Loss [Abstract]
Total accounts receivable	$ 2,130	$ 2,066
Allowance for credit losses	(125)	(98)
Total accounts receivable, net	$ 2,005	$ 1,968