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Cash Flow Information - Disclosure of Non-cash Operating Working Capital (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of cash flow statement [Abstract]      
Accounts receivable $ (869) $ (28) $ (79)
Prepaid expenses 0 9 2
Income taxes receivable (61) 0 (4)
Inventory 6 42 6
Accounts payable, accrued liabilities and provisions 548 153 160
Income taxes payable 60 (2) 4
Change in non-cash operating working capital $ (316) $ 174 $ 89