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Financial and capital management - Details on Trade Receivables Not Impaired (Details) - Loan secured by trade receivables - CAD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Disclosure of internal credit grades [line items]    
Financial assets $ 4,185 $ 3,841
Trade receivables not past due    
Disclosure of internal credit grades [line items]    
Financial assets 3,346 3,158
Trade receivables past due | Under 60 days    
Disclosure of internal credit grades [line items]    
Financial assets 484 421
Trade receivables past due | 60 to 120 days    
Disclosure of internal credit grades [line items]    
Financial assets 240 209
Trade receivables past due | Over 120 days    
Disclosure of internal credit grades [line items]    
Financial assets $ 115 $ 53