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Supplemental Disclosure of Cash Flow Information - Supplemental Schedule Of Cash Flow Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Statement Of Cash Flows, Additional Disclosures [Abstract]      
Accounts receivable $ (441) $ (850) $ 284
Inventory (266) (487) 98
Prepaids and other (20) 39 (56)
Other long-term assets 0 0 (117)
Accounts payable 537 80 (147)
Accrued liabilities 896 525 (254)
Current income tax (liabilities) assets (282) 1,918 (295)
Other long-term liabilities (196) (154) (62)
Net changes in non-cash working capital 228 1,071 (549)
Operating activities 79 964 (166)
Investing activities $ 149 $ 107 $ (383)