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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, 2021 | Dec. 31, 2020
Deferred Tax Assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | $ (271) | $ (211)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 105 | 57
Through OCI | 5 | 3
Ending balance | (161) | (271)
Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 5,383 | 5,902
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 534 | (509)
Through OCI | 56 | (10)
Ending balance | 5,973 | 5,383
Net operating loss and capital loss carryforwards | Deferred Tax Assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (247) | (190)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 106 | 57
Through OCI | 0 | 0
Ending balance | (141) | (247)
Net operating loss and capital loss carryforwards | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (1,038) | (642)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 503 | (408)
Through OCI | 3 | 12
Ending balance | (532) | (1,038)
Property, plant and equipment | Deferred Tax Assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 168 | 144
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 12 | (22)
Through OCI | 0 | (2)
Ending balance | 180 | 168
Property, plant and equipment | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 7,369 | 7,101
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 176 | 294
Through OCI | 1 | (26)
Ending balance | 7,546 | 7,369
Decommissioning and restoration provisions | Deferred Tax Assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (158) | (123)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (32) | 35
Through OCI | 0 | 0
Ending balance | (190) | (158)
Decommissioning and restoration provisions | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (962) | (637)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (86) | (327)
Through OCI | (2) | 2
Ending balance | (1,050) | (962)
Unrealized foreign exchange | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (88) | (116)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 1 | 11
Through OCI | 2 | 17
Ending balance | (85) | (88)
Withholding taxes | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 95 | 91
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 6 | 6
Through OCI | (1) | (2)
Ending balance | 100 | 95
Inventories | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | 110 | 91
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 47 | 19
Through OCI | (1) | 0
Ending balance | 156 | 110
Other temporary differences | Deferred Tax Assets |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (34) | (42)
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | 19 | (13)
Through OCI | 5 | 5
Ending balance | (10) | (34)
Other temporary differences | Deferred Tax Liabilities |  |
Reconciliation of changes in deferred tax liability (asset) [abstract] |  |
Beginning balance | (103) | 14
Changes in deferred tax liability (asset) [abstract] |  |
Through Profit (Loss) | (113) | (104)
Through OCI | 54 | (13)
Ending balance | $ (162) | $ (103)

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