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Income Taxes - Components of Income Tax Expense (Benefit) (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Current income tax expense (benefit): |  |
Current year | $ 964 | $ 859
Adjustments in respect of prior years, including resolution of tax disputes | (41) | 7
Total current income tax expense (benefit) | 923 | 866
Deferred income tax expense (benefit): |  |
Origination and reversal of temporary differences | (204) | (435)
Adjustments in respect of prior years, including resolution of tax disputes | (8) | 48
Tax expense (benefit) arising from unrecognized tax losses | 6 | 15
Tax rate and other legislative changes | 10 | 1
Total deferred income tax expense (benefit) | (196) | (371)
Total income tax expense (benefit) | $ 727 | $ 495

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