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revenue from contracts with customers - Contract assets (Details) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Jan. 01, 2017
Contract assets                  
Contract assets $ 1,279 $ 1,184 $ 1,303 $ 1,191 $ 1,303 $ 1,272 $ 1,303 $ 1,191 $ 1,205
Contract assets at beginning of period 1,279 1,184 1,303            
Net additions arising from operations 303 292 584 548 1,270        
Amounts billed in period and thus reclassified to accounts receivable (313) (287) (617) (561) (1,166)        
Change in impairment allowance, net 2 3 1   (3)        
Other 1 (1) 1 (1) (3)        
Contract assets at end of period 1,272 1,191 1,272 1,191 1,303        
Gross contract assets           907 907 845  
Reclassification to contract liabilities for contracts with contract assets less than contract liabilities           (5) (4) (5)  
Reclassification from contract liabilities for contracts with contract liabilities less than contract assets           (142) (146) (143)  
Contract assets           760 757 697 700
Wireless segment                  
Contract assets                  
Amounts billed in period and thus reclassified to accounts receivable 287 259 567 509 1,060        
As previously reported                  
Contract assets                  
Contract assets 1,279 1,184 1,303 0 0   1,303    
Contract assets at beginning of period 1,279 1,184 1,303 0 0        
Contract assets at end of period         1,303        
IFRS 15 effects                  
Contract assets                  
Contract assets                 1,205
Contract assets           760 757   700
The twelve month period ending one year hence                  
Contract assets                  
Contract assets 907 845 907 845 907 907 907 845 853
Contract assets at beginning of period     907            
Contract assets at end of period 907 845 907 845 907        
The twelve month period ending two years hence                  
Contract assets                  
Contract assets 354 332 385 332 385 354 385 332 338
Contract assets at beginning of period     385            
Contract assets at end of period 354 332 354 332 385        
Thereafter                  
Contract assets                  
Contract assets 11 14 11 14 11 $ 11 $ 11 $ 14 $ 14
Contract assets at beginning of period     11            
Contract assets at end of period $ 11 $ 14 $ 11 $ 14 $ 11