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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, 2021 | Dec. 31, 2020
Income Taxes [Abstract] |  |
Tax expense (recovery) at the Canadian statutory income tax rate of 26.54% (2020 – 26.58%) | $ 1,203 | $ (302)
Tax effect of: |  |
Resource taxes | 426 | 106
Resource and depletion allowances | (61) | (68)
Non-deductible expenses (non-taxable income) | 69 | 28
Tax pools not recognized (recognition of previously unrecognized tax pools) | (56) | 5
Withholding taxes on foreign earnings | 60 | 40
Difference in tax rates in foreign jurisdictions | 15 | 1
Revisions to prior year estimates | (14) | (4)
Tax rate effect from noncontrolling interests | (15) | (2)
Other | (10) | 4
Provision for income taxes | 1,617 | (192)
Represented by: |  |
Current income taxes | 978 | 374
Deferred income taxes | $ 639 | $ (566)

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