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Cash Flow Information - Disclosure of Non-cash Operating Working Capital (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of cash flow statement [Abstract]      
Accounts receivable $ 715 $ (869) $ (28)
Prepaid expenses 0 0 9
Income taxes receivable 27 (61) 0
Inventory (2) 6 42
Accounts payable, accrued liabilities and provisions (550) 548 153
Income taxes payable (66) 60 (2)
Change in non-cash operating working capital $ 124 $ (316) $ 174