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Sale of Steelmaking Coal Business and Discontinued Operations - Summary of Result of Discontinued Operations (Details) - CAD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jul. 11, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Cost of sales |  | $ (7,458) | $ (5,364)
Gross profit |  | 1,607 | 1,112
Other operating income (expenses) |  | (151) | (391)
Non-operating income |  | 7 | (249)
Provision for income taxes |  | (205) | (237)
Profit from discontinued operations |  | 1,206 | 2,620
Shareholders of the company |  | 873 | 2,527
Discontinued operations |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Revenue |  |  | 8,678
Cost of sales |  |  | (4,665)
Gross profit |  |  | 4,013
Other operating income (expenses) |  |  | 117
Net finance expense |  |  | (114)
Non-operating income |  |  | (17)
Profit from discontinued operations before taxes |  |  | 3,999
Provision for income taxes |  |  | (1,371)
Profit from discontinued operations after taxes |  |  | 2,628
Gain on sale | $ 81 |  | (8)
Profit from discontinued operations |  |  | 2,620
Shareholders of the company |  |  | 2,527
Non-controlling interests |  |  | 93
Net of tax expense | $ 897 |  |
Discontinued operations | Steelmaking Coal |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Revenue |  | 4,640 | 8,535
Cost of sales |  | (2,718) | (4,504)
Gross profit |  | 1,922 | 4,031
Other operating income (expenses) |  | (252) | 117
Net finance expense |  | (63) | (112)
Non-operating income |  | 24 | (17)
Profit from discontinued operations before taxes |  | 1,631 | 4,019
Provision for income taxes |  | (506) | (1,373)
Profit from discontinued operations after taxes |  | 1,125 | 2,646
Gain on sale |  | 81 | 0
Profit from discontinued operations |  | 1,206 | 2,646
Shareholders of the company |  | 873 | 2,553
Non-controlling interests |  | 333 | 93
Net of tax expense |  | $ 897 |
Discontinued operations | Fort Hills Energy Limited Partnership |  |  |
Disclosure of analysis of single amount of discontinued operations [line items] |  |  |
Revenue |  |  | 143
Cost of sales |  |  | (161)
Gross profit |  |  | (18)
Other operating income (expenses) |  |  | 0
Net finance expense |  |  | (2)
Non-operating income |  |  | 0
Profit from discontinued operations before taxes |  |  | (20)
Provision for income taxes |  |  | 2
Profit from discontinued operations after taxes |  |  | (18)
Gain on sale |  |  | (8)
Profit from discontinued operations |  |  | (26)
Shareholders of the company |  |  | (26)
Non-controlling interests |  |  | $ 0

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