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Income Taxes - Summary of Deferred Tax Expense Charged (Credited) to Income Statement (Detail) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Deferred Tax Assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | $ (75) | $ (161)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 2 | (67)
Through OCI | (12) | (19)
Transfer | 0 | 0
Ending balance | (65) | (75)
Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 6,778 | 5,973
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 689 | (831)
Through OCI | (31) | (42)
Transfer | 68 | (68)
Ending balance | 6,188 | 6,778
Net operating loss and capital loss carryforwards | Deferred Tax Assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (48) | (141)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 13 | (98)
Through OCI | 0 | 5
Transfer | 0 | 0
Ending balance | (61) | (48)
Net operating loss and capital loss carryforwards | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (458) | (532)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 205 | (93)
Through OCI | (11) | 19
Transfer | 0 | 0
Ending balance | (652) | (458)
Property, plant and equipment | Deferred Tax Assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 165 | 180
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (2) | 15
Through OCI | 0 | 0
Transfer | 0 | 0
Ending balance | 167 | 165
Property, plant and equipment | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 7,234 | 7,546
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (638) | 333
Through OCI | 46 | (89)
Transfer | 68 | (68)
Ending balance | 7,894 | 7,234
Decommissioning and restoration provisions | Deferred Tax Assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (155) | (190)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 12 | (35)
Through OCI | 0 | 0
Transfer | 0 | 0
Ending balance | (167) | (155)
Decommissioning and restoration provisions | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (803) | (1,050)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 371 | (261)
Through OCI | (7) | 14
Transfer | 0 | 0
Ending balance | (1,167) | (803)
Unrealized foreign exchange | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (91) | (85)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (7) | (3)
Through OCI | (9) | 9
Transfer | 0 | 0
Ending balance | (75) | (91)
Withholding taxes | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 133 | 100
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 14 | (27)
Through OCI | 3 | (6)
Transfer | 0 | 0
Ending balance | 116 | 133
Inventories | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 148 | 156
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (10) | 9
Through OCI | (3) | (1)
Transfer | 0 | 0
Ending balance | 161 | 148
Other timing differences (TDs) | Deferred Tax Assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (37) | (10)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (21) | 51
Through OCI | (12) | (24)
Transfer | 0 | 0
Ending balance | (4) | (37)
Other timing differences (TDs) | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 615 | (162)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 754 | (789)
Through OCI | (50) | 12
Transfer | 0 | 0
Ending balance | $ (89) | $ 615

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