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Consolidated Statements of Income - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Profit or loss [abstract]    
Revenue $ 15,096 $ 14,369
Operating expenses:    
Operating costs 9,113 8,867
Depreciation and amortization 2,211 2,142
Gain on disposition of property, plant and equipment (16) (49)
Restructuring, acquisition and other 210 152
Finance costs 793 746
Other income (32) (19)
Income before income tax expense 2,817 2,530
Income tax expense 758 685
Net income $ 2,059 $ 1,845
Earnings per share:    
Basic (in dollars per share) $ 4.00 $ 3.58
Diluted (in dollars per share) $ 3.99 $ 3.57