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Income Taxes - Summary of Deferred Tax Expense Charged (Credited) to Income Statement (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023
Changes in deferred tax liability (asset) [abstract] |  |
Sale | $ (206) |
Deferred Tax Assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (65) | $ (75)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 519 | 2
Through OCI | 18 | (12)
Transfer | (30) |
Sale | 0 | 0
Ending balance | (572) | (65)
Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 6,188 | 6,778
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (533) | 689
Through OCI | (117) | (31)
Transfer | (30) |
Sale | (4,515) |
Sale of Steelmaking Coal Business |  | 68
Ending balance | 2,293 | 6,188
Net operating loss and capital loss carryforwards | Deferred Tax Assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (61) | (48)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 536 | 13
Through OCI | 66 | 0
Transfer | 509 |
Sale | 0 | 0
Ending balance | (1,172) | (61)
Net operating loss and capital loss carryforwards | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (652) | (458)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (140) | 205
Through OCI | 0 | (11)
Transfer | 509 |
Sale | 1 | 0
Ending balance | (2) | (652)
Property, plant and equipment | Deferred Tax Assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 167 | 165
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (10) | (2)
Through OCI | (116) | 0
Transfer | (521) |
Sale | 0 | 0
Ending balance | 814 | 167
Property, plant and equipment | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 7,894 | 7,234
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (166) | (638)
Through OCI | (112) | 46
Transfer | (521) |
Sale | (4,482) | 68
Ending balance | 3,169 | 7,894
Decommissioning and restoration provisions | Deferred Tax Assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (167) | (155)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (77) | 12
Through OCI | (2) | 0
Transfer | 39 |
Sale | 0 | 0
Ending balance | (127) | (167)
Decommissioning and restoration provisions | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (1,167) | (803)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (13) | 371
Through OCI | 20 | (7)
Transfer | 39 |
Sale | (48) | 0
Ending balance | (1,183) | (1,167)
Unrealized foreign exchange | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (75) | (91)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (41) | (7)
Through OCI | 7 | (9)
Transfer | 0 |
Sale | 0 | 0
Ending balance | (41) | (75)
Withholding taxes | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 116 | 133
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (25) | 14
Through OCI | (10) | 3
Transfer | 0 |
Sale | 0 | 0
Ending balance | 151 | 116
Inventories | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 161 | 148
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (9) | (10)
Through OCI | 1 | (3)
Transfer | 5 |
Sale | 19 | 0
Ending balance | 193 | 161
Other temporary differences (TDs) | Deferred Tax Assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (4) | (37)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 70 | (21)
Through OCI | 70 | (12)
Transfer | (57) |
Sale | 0 | 0
Ending balance | (87) | (4)
Other temporary differences (TDs) | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (89) | 615
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (139) | 754
Through OCI | (23) | (50)
Transfer | (62) |
Sale | (5) | 0
Ending balance | $ 6 | $ (89)

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