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Supplementary Cash Flow Information - Non-Cash Working Capital (Details) - CAD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Disclosure Of Supplementary Cash Flow Information [Line Items]          
Current assets $ 10,745   $ 10,745   $ 12,430
Current Liabilities 7,205   7,205   8,021
Working Capital 3,540   3,540   4,409
Adjusted working capital 3,800   3,800   4,700
Contingent Payments 295   295   $ 263
Accounts Receivable and Accrued Revenues (1,288) $ 1,746 (1,097) $ 119  
Income Tax Receivable 157 (111) (12) (88)  
Inventories (505) 1,138 (343) (172)  
Accounts Payable and Accrued Liabilities 851 (1,547) 69 (388)  
Income Tax Payable 107 74 (1,056) 877  
Total Change in Non-Cash Working Capital (678) 1,300 (2,439) 348  
Net Change in Non-Cash Working Capital – Operating Activities (641) 1,193 (2,142) (98)  
Net Change in Non-Cash Working Capital – Investing Activities $ (37) $ 107 $ (297) $ 446