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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, 2020 | Dec. 31, 2019
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | $ 211 | $ 160
Through Profit (Loss) | 57 | 90
Through OCI | 3 | (30)
Through Equity | 0 | (9)
Deferred income tax assets | 271 | 211
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | 5,902 | 6,311
Through Profit (Loss) | (509) | (366)
Through OCI | (10) | (37)
Through Equity | 0 | (6)
Deferred tax liabilities | 5,383 | 5,902
Net operating loss carryforwards |  |
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | 190 | 139
Through Profit (Loss) | 57 | 54
Through OCI | 0 | (3)
Through Equity | 0 | 0
Deferred income tax assets | 247 | 190
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | (642) | (750)
Through Profit (Loss) | (408) | 111
Through OCI | 12 | 3
Through Equity | 0 | (6)
Deferred tax liabilities | (1,038) | (642)
Property, plant and equipment |  |
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | (144) | (130)
Through Profit (Loss) | (22) | (13)
Through OCI | (2) | (1)
Through Equity | 0 | 0
Deferred income tax assets | (168) | (144)
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | 7,101 | 7,402
Through Profit (Loss) | 294 | (232)
Through OCI | (26) | (69)
Through Equity | 0 | 0
Deferred tax liabilities | 7,369 | 7,101
Decommissioning and restoration provisions |  |
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | 123 | 94
Through Profit (Loss) | 35 | 29
Through OCI | 0 | 0
Through Equity | 0 | 0
Deferred income tax assets | 158 | 123
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | (637) | (474)
Through Profit (Loss) | (327) | (170)
Through OCI | 2 | 7
Through Equity | 0 | 0
Deferred tax liabilities | (962) | (637)
U.S. alternative minimum tax credits |  |
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | 0 | (38)
Through Profit (Loss) |  | 37
Through OCI |  | 1
Through Equity |  | 0
Deferred tax liabilities |  | 0
Unrealized foreign exchange |  |
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | (116) | (146)
Through Profit (Loss) | 11 | 4
Through OCI | 17 | 26
Through Equity | 0 | 0
Deferred tax liabilities | (88) | (116)
Withholding taxes |  |
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | 91 | 104
Through Profit (Loss) | 6 | (8)
Through OCI | (2) | (5)
Through Equity | 0 | 0
Deferred tax liabilities | 95 | 91
Inventories |  |
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | 91 | 97
Through Profit (Loss) | 19 | (5)
Through OCI | 0 | (1)
Through Equity | 0 | 0
Deferred tax liabilities | 110 | 91
Other temporary differences |  |
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | 42 | 57
Through Profit (Loss) | (13) | 20
Through OCI | 5 | (26)
Through Equity | 0 | (9)
Deferred income tax assets | 34 | 42
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | 14 | 116
Through Profit (Loss) | (104) | (103)
Through OCI | (13) | 1
Through Equity | 0 | 0
Deferred tax liabilities | (103) | 14
Previously Reported |  |
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | 211 |
Deferred income tax assets |  | 211
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | 5,902 |
Deferred tax liabilities |  | 5,902
Previously Reported | Net operating loss carryforwards |  |
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | 190 |
Deferred income tax assets |  | 190
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | (642) |
Deferred tax liabilities |  | (642)
Previously Reported | Property, plant and equipment |  |
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | (144) |
Deferred income tax assets |  | (144)
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | 7,101 |
Deferred tax liabilities |  | 7,101
Previously Reported | Decommissioning and restoration provisions |  |
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | 123 |
Deferred income tax assets |  | 123
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | (637) |
Deferred tax liabilities |  | (637)
Previously Reported | Unrealized foreign exchange |  |
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | (116) |
Deferred tax liabilities |  | (116)
Previously Reported | Withholding taxes |  |
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | 91 |
Deferred tax liabilities |  | 91
Previously Reported | Inventories |  |
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | 91 |
Deferred tax liabilities |  | 91
Previously Reported | Other temporary differences |  |
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | 42 |
Deferred income tax assets |  | 42
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | $ 14 |
Deferred tax liabilities |  | $ 14

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