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Significant partly-owned subsidiary - Selected Income and Cash Flow Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Disclosure of subsidiaries [line items]    
Operating revenues $ 22,883 $ 23,793
Net earnings 2,699 3,253
Net earnings attributable to NCI 65 62
Total comprehensive income 3,153 3,486
Total comprehensive income attributable to NCI 64 58
Subsidiaries with material non-controlling interests    
Disclosure of subsidiaries [line items]    
Operating revenues 754 878
Net earnings 202 193
Net earnings attributable to NCI 64 61
Total comprehensive income 200 181
Total comprehensive income attributable to NCI 63 58
Cash dividends paid to NCI 53 $ 65
CTV Specialty hedge    
Disclosure of subsidiaries [line items]    
Total comprehensive income attributable to NCI $ 5