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Business acquisitions and disposition - Summary of Assets and Liabilities Sold (Details) - CAD ($)
$ in Millions
Dec. 31, 2023
May 03, 2023
Dec. 31, 2022
Dec. 31, 2021
Disclosure of analysis of single amount of discontinued operations [line items]        
Trade and other receivables $ 4,031   $ 4,138  
Prepaid expenses 230   244  
Intangible assets 16,609   16,183 $ 15,570
Goodwill 10,942   10,906  
Total assets 71,940   69,329  
Trade payables and other liabilities 4,729   5,221  
Contract liabilities 811   857  
Debt due within one year 5,042   4,137  
Long-term debt 31,135   27,783  
Deferred tax liabilities 4,869   4,953  
Total liabilities 51,383   46,814  
Non-controlling interest $ 328   $ 337  
Disposal Group, Disposed Of By Sale        
Disclosure of analysis of single amount of discontinued operations [line items]        
Trade and other receivables   $ 1    
Prepaid expenses   1    
Property, plant and equipment   179    
Intangible assets   4    
Goodwill   76    
Total assets   261    
Trade payables and other liabilities   10    
Contract liabilities   3    
Debt due within one year   11    
Long-term debt   82    
Deferred tax liabilities   3    
Total liabilities   109    
Non-controlling interest   23    
Total net assets   $ 129