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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, 2020
Dec. 31, 2019
Disclosure of internal credit grades [line items]    
Financial assets $ 3,265 $ 2,919
Trade receivables not past due    
Disclosure of internal credit grades [line items]    
Financial assets 2,574 2,082
Trade receivables past due | Under 60 days    
Disclosure of internal credit grades [line items]    
Financial assets 432 541
Trade receivables past due | 60 to 120 days    
Disclosure of internal credit grades [line items]    
Financial assets 214 232
Trade receivables past due | Over 120 days    
Disclosure of internal credit grades [line items]    
Financial assets $ 45 $ 64