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Significant partly-owned subsidiary - Selected Income and Cash Flow Information (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Disclosure of subsidiaries [line items]    
Operating revenues $ 24,409 $ 24,673
Net earnings 375 2,327
Net earnings attributable to NCI 31 64
Total comprehensive income 863 1,979
Total comprehensive income attributable to NCI 34 61
Subsidiaries with material non-controlling interests    
Disclosure of subsidiaries [line items]    
Operating revenues 991 969
Net earnings 100 209
Net earnings attributable to NCI 31 65
Total comprehensive income 108 196
Total comprehensive income attributable to NCI 34 61
Cash dividends paid to NCI 68 47
CTV Specialty hedge    
Disclosure of subsidiaries [line items]    
Total comprehensive income attributable to NCI $ 2 $ 3