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Supplementary Cash Flow Information - Non-Cash Working Capital (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure Of Supplementary Cash Flow Information [Abstract]    
Accounts Receivable and Accrued Revenues $ 547 $ 314
Income Tax Receivable 199 (295)
Inventories (117) 216
Accounts Payable and Accrued Liabilities 299 (685)
Income Tax Payable 322 (1,112)
Total Change in Non-Cash Working Capital 1,250 (1,562)
Net Change in Non-Cash Working Capital – Operating Activities 1,305 (1,193)
Net Change in Non-Cash Working Capital – Investing Activities $ (55) $ (369)