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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, 2022 | Dec. 31, 2021
Deferred Tax Assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | $ (161) | $ (271)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 67 | (105)
Through OCI | 19 | (5)
Transfer | 0 |
Ending balance | (75) | (161)
Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 5,973 | 5,383
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 831 | 534
Through OCI | 42 | 56
Transfer | (68) |
Ending balance | 6,778 | 5,973
Net operating loss and capital loss carryforwards | Deferred Tax Assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (141) | (247)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 98 | (106)
Through OCI | (5) | 0
Transfer | 0 |
Ending balance | (48) | (141)
Net operating loss and capital loss carryforwards | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (532) | (1,038)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 93 | 503
Through OCI | (19) | 3
Transfer | 0 |
Ending balance | (458) | (532)
Property, plant and equipment | Deferred Tax Assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 180 | 168
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (15) | (12)
Through OCI | 0 | 0
Transfer | 0 |
Ending balance | 165 | 180
Property, plant and equipment | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 7,546 | 7,369
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (333) | 176
Through OCI | 89 | 1
Transfer | (68) |
Ending balance | 7,234 | 7,546
Decommissioning and restoration provisions | Deferred Tax Assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (190) | (158)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 35 | 32
Through OCI | 0 | 0
Transfer | 0 |
Ending balance | (155) | (190)
Decommissioning and restoration provisions | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (1,050) | (962)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 261 | (86)
Through OCI | (14) | (2)
Transfer | 0 |
Ending balance | (803) | (1,050)
Unrealized foreign exchange | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (85) | (88)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 3 | 1
Through OCI | (9) | 2
Transfer | 0 |
Ending balance | (91) | (85)
Withholding taxes | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 100 | 95
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 27 | 6
Through OCI | 6 | (1)
Transfer | 0 |
Ending balance | 133 | 100
Inventories | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 156 | 110
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (9) | 47
Through OCI | 1 | (1)
Transfer | 0 |
Ending balance | 148 | 156
Other timing differences (TDs) | Deferred Tax Assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (10) | (34)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (51) | (19)
Through OCI | 24 | (5)
Transfer | 0 |
Ending balance | (37) | (10)
Other timing differences (TDs) | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (162) | (103)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 789 | (113)
Through OCI | (12) | 54
Transfer | 0 |
Ending balance | $ 615 | $ (162)

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