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Discontinued operations - Income Statement (Details) - CAD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2021
Dec. 31, 2020
Disclosure of analysis of single amount of discontinued operations [line items]      
Operating revenues   $ 23,449 $ 22,883
Operating costs   (13,556) (13,276)
Depreciation   (3,627) (3,475)
Amortization   (982) (929)
Other income (expense)   160 (194)
Gain on sale (net of taxes of $3 million) $ 211    
Net earnings attributable to common shareholders   $ 0 226
Tax expense (income) relating to gain (loss) on discontinuance     (3)
Discontinued operations      
Disclosure of analysis of single amount of discontinued operations [line items]      
Operating revenues     118
Operating costs     (57)
Depreciation     (18)
Amortization     (7)
Interest expense     (6)
Other income (expense)     (8)
Income taxes     (7)
Net earnings attributable to common shareholders before gain on sale     15
Gain on sale (net of taxes of $3 million)     211
Net earnings attributable to common shareholders     $ 226