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Significant partly-owned subsidiary - Selected Income and Cash Flow Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Disclosure of subsidiaries [line items]    
Operating revenues $ 24,673 $ 24,174
Net earnings 2,327 2,926
Net earnings attributable to NCI 64 58
Total comprehensive income 1,979 3,108
Total comprehensive income attributable to NCI 61 65
Subsidiaries with material non-controlling interests    
Disclosure of subsidiaries [line items]    
Operating revenues 969 986
Net earnings 209 180
Net earnings attributable to NCI 65 57
Total comprehensive income 196 198
Total comprehensive income attributable to NCI 61 63
Cash dividends paid to NCI 47 39
CTV Specialty hedge    
Disclosure of subsidiaries [line items]    
Total comprehensive income attributable to NCI $ 3 $ 4