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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, 2018
Dec. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]          
Balance, beginning of period $ 340 $ 303      
Additions 321 308      
Amortization (290) (271)      
Balance, end of period 371 340      
Current     $ 261 $ 233  
Non-current     110 107 $ 93
Total 340 303 371 340  
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 329 295      
Additions 313 304      
Amortization (286) (270)      
Balance, end of period 356 329      
Current     256 230  
Non-current     100 99  
Total 329 295 356 329  
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 11 8      
Additions 8 4      
Amortization (4) (1)      
Balance, end of period 15 11      
Current     5 3  
Non-current     10 8  
Total 11 8 $ 15 11  
As previously reported          
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]          
Balance, beginning of period 340        
Balance, end of period   340      
Total 340 340   340  
As previously reported | 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 329        
Balance, end of period   329      
Total 329 329   329  
As previously reported | 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 11        
Balance, end of period   11      
Total $ 11 11   $ 11  
Transitional amount          
Disclosure of assets recognised from costs to obtain or fulfil contracts with customers [line items]          
Balance, beginning of period   303      
Total   303      
Transitional amount | 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   295      
Total   295      
Transitional amount | 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   8      
Total   $ 8