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Significant partly-owned subsidiary - Selected Income and Cash Flow Information (Details) - CAD ($)
$ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of subsidiaries [line items]    
Operating revenues $ 24,174 $ 23,449
Net earnings 2,926 2,892
Net earnings attributable to NCI 58 52
Total comprehensive income 3,108 4,763
Total comprehensive income attributable to NCI 65 54
Subsidiaries with material non-controlling interests    
Disclosure of subsidiaries [line items]    
Operating revenues 986 879
Net earnings 180 158
Net earnings attributable to NCI 57 51
Total comprehensive income 198 164
Total comprehensive income attributable to NCI 63 53
Cash dividends paid to NCI 39 86
CTV Specialty hedge    
Disclosure of subsidiaries [line items]    
Total comprehensive income attributable to NCI $ 4 $ 5