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Income Taxes - Summary of Reconciliation of Income Taxes (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Income Taxes [Abstract] |  |
Tax expense (recovery) at the Canadian statutory income tax rate of 26.94% (2018 – 27%) | $ (126) | $ 1,217
Tax effect of: |  |
Resource taxes | 226 | 360
Resource and depletion allowances | (85) | (80)
Non-deductible expenses (non-taxable income) | (6) | (157)
Initial recognition exemption related to the Frontier oil sands project | 117 | 0
Tax pools not recognized (recognition of previously unrecognized tax pools) | (2) | 4
Effect due to tax legislative changes | (39) | 0
Withholding taxes on foreign earnings | 39 | 47
Difference in tax rates in foreign jurisdictions | (2) | 2
Revisions to prior year estimates | 2 | (21)
Other | (4) | (7)
Provision for income taxes | 120 | 1,365
Represented by: |  |
Current income taxes | 576 | 691
Deferred income taxes | (456) | 674
Provision for income taxes | $ 120 | $ 1,365

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