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other long-term assets - Costs incurred to obtain and fulfill contracts with customers (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]        
Balance, beginning of period $ 358 $ 371    
Additions 265 292    
Amortization (289) (305)    
Balance, end of period 334 358    
Current [1]     $ 231 $ 249
Non-current     103 109
Total 334 358 334 358
Costs incurred to obtain contracts with customers        
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]        
Balance, beginning of period 344 356    
Additions 261 288    
Amortization (282) (300)    
Balance, end of period 323 344    
Current [1]     225 243
Non-current     98 101
Total 323 344 323 344
Costs incurred to fulfill contracts with customers        
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]        
Balance, beginning of period 14 15    
Additions 4 4    
Amortization (7) (5)    
Balance, end of period 11 14    
Current [1]     6 6
Non-current     5 8
Total $ 11 $ 14 $ 11 $ 14
[1] Presented in the Consolidated statements of financial position in prepaid expenses.