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Discontinued operations - Income Statement (Details) - CAD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Discontinued operations      
Disclosure of analysis of single amount of discontinued operations [line items]      
Revenues   $ 118 $ 171
Operating costs   (57) (71)
Depreciation   (18) (38)
Amortization   (7) (16)
Interest expense      
Interest expense   (6) (7)
Other (expense) income   (8) (6)
Income taxes   (7) (4)
Net earnings attributable to common shareholders before gain on sale   15 29
Gain on sale (net of taxes of $3 million)   211 0
Net earnings attributable to common shareholders   226 29
Revenues   22,883 23,793
Operating costs   (13,276) (13,787)
Depreciation   (3,475) (3,458)
Amortization   (929) (886)
Interest expense   (1,110) (1,125)
Other (expense) income   (194) 95
Gain on sale (net of taxes of $3 million) $ 211    
Tax expense (income) relating to gain (loss) on discontinuance   (3)  
Net earnings attributable to common shareholders   $ 226 $ 29