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Income Taxes - Narrative (Details) - CAD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Tax Disclosure [Abstract]    
Effective tax rate 24.05% 31.10%
Effective tax rate, excluding discrete items 24.60% 25.00%
Foreign exchange (gain) loss on debt and lease liabilities $ (33) $ 215
Acquisition-related costs $ (36)