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Consolidated Statements of Income - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Profit or loss [abstract]    
Revenue $ 13,916 $ 15,073
Operating expenses:    
Operating costs 8,059 8,861
Depreciation and amortization 2,618 2,488
Restructuring, acquisition and other 185 139
Finance costs 881 840
Other expense (income) 1 (10)
Income before income tax expense 2,172 2,755
Income tax expense 580 712
Net income for the year $ 1,592 $ 2,043
Earnings per share:    
Basic (in dollars per share) $ 3.15 $ 3.99
Diluted (in dollars per share) $ 3.13 $ 3.97