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Significant partly-owned subsidiary - Selected Income and Cash Flow Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Disclosure of subsidiaries [line items]    
Operating revenues $ 23,449 $ 22,883
Net earnings 2,892 2,699
Net earnings attributable to NCI 52 65
Total comprehensive income 4,763 3,153
Total comprehensive income attributable to NCI 54 64
Subsidiaries with material non-controlling interests    
Disclosure of subsidiaries [line items]    
Operating revenues 879 754
Net earnings 158 202
Net earnings attributable to NCI 51 64
Total comprehensive income 164 200
Total comprehensive income attributable to NCI 53 63
Cash dividends paid to NCI 86 53
CTV Specialty hedge    
Disclosure of subsidiaries [line items]    
Total comprehensive income attributable to NCI $ 5 $ 5