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Cash Flow Information - Disclosure of Non-cash Operating Working Capital (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Disclosure of cash flow statement [Abstract]      
Accounts receivable $ 155 $ 715 $ (869)
Prepaid expenses 85 0 0
Income taxes receivable 22 27 (61)
Inventory 34 (2) 6
Accounts payable, accrued liabilities and provisions (273) (550) 548
Income taxes payable 15 (66) 60
Change in non-cash operating working capital $ 38 $ 124 $ (316)