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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, 2019 | Dec. 31, 2018
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | $ 160 | $ 154
Through Profit or Loss | 90 | (11)
Through OCI | (30) | 17
Through Equity | (9) | 0
Deferred income tax assets | 211 | 160
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | 6,331 | 5,579
Through Profit or Loss | (366) | 663
Through OCI | (37) | 89
Through Equity | (6) | 0
Deferred tax liabilities | 5,902 | 6,331
Net operating loss carryforwards |  |
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | 139 | 58
Through Profit or Loss | 54 | 80
Through OCI | (3) | 1
Through Equity | 0 | 0
Deferred income tax assets | 190 | 139
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | (750) | (1,065)
Through Profit or Loss | 111 | 312
Through OCI | 3 | 3
Through Equity | (6) | 0
Deferred tax liabilities | (642) | (750)
Property, plant and equipment |  |
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | (130) | (189)
Through Profit or Loss | (13) | 58
Through OCI | (1) | 1
Through Equity | 0 | 0
Deferred income tax assets | (144) | (130)
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | 7,422 | 7,390
Through Profit or Loss | (232) | (94)
Through OCI | (69) | 126
Through Equity | 0 | 0
Deferred tax liabilities | 7,101 | 7,422
Decommissioning and restoration provisions |  |
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | 94 | 78
Through Profit or Loss | 29 | 16
Through OCI | 0 | 0
Through Equity | 0 | 0
Deferred income tax assets | 123 | 94
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | (474) | (754)
Through Profit or Loss | (170) | 287
Through OCI | 7 | (7)
Through Equity | 0 | 0
Deferred tax liabilities | (637) | (474)
U.S. alternative minimum tax credits |  |
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | 0 | 143
Through Profit or Loss |  | (148)
Through OCI |  | 5
Through Equity |  | 0
Deferred income tax assets |  | 0
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | (38) | 0
Through Profit or Loss | 37 | (38)
Through OCI | 1 | 0
Through Equity | 0 | 0
Deferred tax liabilities | 0 | (38)
Unrealized foreign exchange |  |
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | (146) | (135)
Through Profit or Loss | 4 | 29
Through OCI | 26 | (40)
Through Equity | 0 | 0
Deferred tax liabilities | (116) | (146)
Withholding taxes |  |
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | 104 | 79
Through Profit or Loss | (8) | 18
Through OCI | (5) | 7
Through Equity | 0 | 0
Deferred tax liabilities | 91 | 104
Inventories |  |
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | 97 | 65
Through Profit or Loss | (5) | 32
Through OCI | (1) | 0
Through Equity | 0 | 0
Deferred tax liabilities | 91 | 97
Other temporary differences |  |
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | 57 | 64
Through Profit or Loss | 20 | (17)
Through OCI | (26) | 10
Through Equity | (9) | 0
Deferred income tax assets | 42 | 57
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | 116 | (1)
Through Profit or Loss | (103) | 117
Through OCI | 1 | 0
Through Equity | 0 | 0
Deferred tax liabilities | 14 | 116
Previously Reported |  |
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | 160 |
Deferred income tax assets |  | 160
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | 6,311 |
Deferred tax liabilities |  | 6,311
Previously Reported | Net operating loss carryforwards |  |
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | 139 |
Deferred income tax assets |  | 139
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | (750) |
Deferred tax liabilities |  | (750)
Previously Reported | Property, plant and equipment |  |
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | (130) |
Deferred income tax assets |  | (130)
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | 7,402 |
Deferred tax liabilities |  | 7,402
Previously Reported | Decommissioning and restoration provisions |  |
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | 94 |
Deferred income tax assets |  | 94
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | (474) |
Deferred tax liabilities |  | (474)
Previously Reported | U.S. alternative minimum tax credits |  |
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | (38) |
Deferred tax liabilities |  | (38)
Previously Reported | Unrealized foreign exchange |  |
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | (146) |
Deferred tax liabilities |  | (146)
Previously Reported | Withholding taxes |  |
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | 104 |
Deferred tax liabilities |  | 104
Previously Reported | Inventories |  |
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | 97 |
Deferred tax liabilities |  | 97
Previously Reported | Other temporary differences |  |
Deferred Income Tax Assets [Abstract] |  |
Deferred income tax assets | 57 |
Deferred income tax assets |  | 57
Deferred Income Tax Liabilities [Abstract] |  |
Deferred tax liabilities | $ 116 |
Deferred tax liabilities |  | $ 116

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