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revenue from contracts with customers - Contract assets (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Jan. 01, 2017
Contract assets            
Contract assets $ 1,303 $ 1,303 $ 1,475 $ 1,303 $ 1,303 $ 1,205
Contract assets at beginning of period 1,303          
Net additions arising from operations 1,455 1,270        
Amounts billed in period and thus reclassified to accounts receivable (1,284) (1,166)        
Change in impairment allowance, net (1) (3)        
Other 2 (3)        
Contract assets at end of period 1,475 1,303        
Gross contract assets     1,017   907  
Reclassification to contract liabilities of contracts with contract assets less than contract liabilities     (3)   (4)  
Reclassification from contract liabilities of contracts with contract liabilities less than contract assets     (154)   (146)  
Contract assets     860   757 700
Wireless segment            
Contract assets            
Amounts billed in period and thus reclassified to accounts receivable 1,180 1,060        
As previously reported            
Contract assets            
Contract assets 1,303 0     1,303  
Contract assets at beginning of period 1,303 0        
Contract assets at end of period   1,303        
IFRS 15 effects            
Contract assets            
Contract assets           1,205
Contract assets     860   757 700
The twelve month period ending one year hence            
Contract assets            
Contract assets 907 907 1,017   907 853
Contract assets at beginning of period 907          
Contract assets at end of period 1,017 907        
The twelve month period ending two years hence            
Contract assets            
Contract assets 385 385 444   385 338
Contract assets at beginning of period 385          
Contract assets at end of period 444 385        
Thereafter            
Contract assets            
Contract assets 11 11 $ 14   $ 11 $ 14
Contract assets at beginning of period 11          
Contract assets at end of period $ 14 $ 11