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Consolidated Statements of Income - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Profit or loss [abstract]    
Revenue $ 15,073 $ 15,096
Operating expenses:    
Operating costs 8,861 9,113
Depreciation and amortization 2,488 2,211
Gain on disposition of property, plant and equipment 0 (16)
Restructuring, acquisition and other 139 210
Finance costs 840 793
Other income (10) (32)
Income before income tax expense 2,755 2,817
Income tax expense 712 758
Net (loss) income $ 2,043 $ 2,059
Earnings per share:    
Basic (in dollars per share) $ 3.99 $ 4.00
Diluted (in dollars per share) $ 3.97 $ 3.99