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Sale of Steelmaking Coal Business and Discontinued Operations - Additional Information (Details) $ in Millions, $ in Billions |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jul. 11, 2024 CAD ($) | Jul. 11, 2024 USD ($) | Jan. 03, 2024 CAD ($) | Jan. 03, 2024 USD ($) | Feb. 02, 2023 CAD ($) | Dec. 31, 2024 CAD ($) | Dec. 31, 2023 CAD ($)
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Cash |  |  |  |  |  | $ 2,343 | $ 399
Financial liabilities |  |  |  |  |  | 19,941 | 27,901
Attributable to non-controlling interests (Note 30) |  |  |  |  |  | 1,019 | 1,304
Profit from discontinued operations |  |  |  |  |  | 1,206 | 2,620
Revenue from contracts with customers |  |  |  |  |  | 9,065 | 6,476
Sale of minority interest in steelmaking coal business |  |  |  |  |  | $ 1,675 | 0
Discontinued operations |  |  |  |  |  |  |
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proceeds from sale of business | $ 9,900 | $ 7.3 |  |  |  |  |
Property, plant and equipment, asset derecognized | 20,000 |  |  |  |  |  |
Property, plant and equipment, derecognized | 17,000 |  |  |  |  |  |
Cash | 256 |  |  |  |  |  |
Financial liabilities | 8,000 |  |  |  |  |  |
Remeasurement of decommissioning and restoration provisions for closed operations | 2,000 |  |  |  |  |  |
Attributable to non-controlling interests (Note 30) | 3,000 |  |  |  |  |  |
Profit from discontinued operations |  |  |  |  |  |  | 2,620
Gain on sale | 81 |  |  |  |  |  | (8)
Net of tax expense | $ 897 |  |  |  |  |  |
One Customer |  |  |  |  |  |  |
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Revenue from contracts with customers |  |  |  |  |  |  | $ 1,500
NSC |  |  |  |  |  |  |
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Sale of minority interest in steelmaking coal business |  |  | $ 1,700 | $ 1.3 |  |  |
Fort Hills Energy Limited Partnership |  |  |  |  |  |  |
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proportion of ownership interest in joint operation |  |  |  |  | 21.30% |  |
Property, plant and equipment, derecognized |  |  |  |  | $ 1,300 |  |
Proceeds from disposal of mining assets |  |  |  |  | 1,000 |  |
Disposal group, including discontinued operation, liabilities |  |  |  |  | 269 |  |
Disposal group, including discontinued operation, liabilities, current |  |  |  |  | 26 |  |
Disposal group, including discontinued operation, liabilities, noncurrent |  |  |  |  | 243 |  |
Liabilities derecognized |  |  |  |  | $ 454 |  |
Elk Valley Resources Ltd. |  |  |  |  |  |  |
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Sale of steelmaking coal business (Note 5) |  |  | $ 1,500 |  |  |  |
Elk Valley Resources Ltd. | NSC |  |  |  |  |  |  |
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 20.00% | 20.00% |  |  |
Elk Valley Resources Ltd. | POSCO |  |  |  |  |  |  |
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 3.00% | 3.00% |  |  |
Elk Valley Resources Ltd. | Glencore |  |  |  |  |  |  |
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 77.00% | 77.00% |  |  |
Elkview operations | NSC |  |  |  |  |  |  |
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 2.50% | 2.50% |  |  |
Elkview operations | POSCO |  |  |  |  |  |  |
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 2.50% | 2.50% |  |  |
Greenhill operations | POSCO |  |  |  |  |  |  |
Disclosure Of Non-current Assets Held For Sale And Discontinued Operations [Line Items] |  |  |  |  |  |  |
Proportion of ownership interest in subsidiary |  |  | 20.00% | 20.00% |  |  |

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