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intangible assets and goodwill (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Jan. 01, 2017
intangible assets and goodwill      
Balance at beginning of the period $ 14,894    
Amortization (598) $ (552)  
Balance at end of the period 15,689 14,894  
Goodwill 4,733 4,236 $ 3,787
Contractual commitments for the acquisition of intangible assets 59 36  
Cost/Gross amount      
intangible assets and goodwill      
Balance at beginning of the period 18,959 17,929  
Additions 657 617  
Additions arising from business acquisitions 694 687  
Dispositions, retirements and other (385) (271)  
Net foreign exchange differences 40 (3)  
Balance at end of the period 19,965 18,959  
Accumulated amortization      
intangible assets and goodwill      
Balance at beginning of the period (4,065) (3,778)  
Amortization (598) (552)  
Dispositions, retirements and other (387) (265)  
Balance at end of the period (4,276) (4,065)  
Allowance for doubtful accounts      
intangible assets and goodwill      
Goodwill 0    
Spectrum licences      
intangible assets and goodwill      
Balance at beginning of the period 8,693    
Balance at end of the period $ 8,694 8,693  
Renewal of spectrum license ( in years) 20 years    
Spectrum licences | Cost/Gross amount      
intangible assets and goodwill      
Balance at beginning of the period $ 8,693 8,693  
Additions 1    
Balance at end of the period 8,694 8,693  
Total intangible assets      
intangible assets and goodwill      
Balance at beginning of the period 10,658    
Balance at end of the period 10,956 10,658  
Total intangible assets | Cost/Gross amount      
intangible assets and goodwill      
Balance at beginning of the period 14,359 13,778  
Additions 657 617  
Additions arising from business acquisitions 238 235  
Dispositions, retirements and other (385) (271)  
Net foreign exchange differences (1)    
Balance at end of the period 14,868 14,359  
Total intangible assets | Accumulated amortization      
intangible assets and goodwill      
Balance at beginning of the period (3,701) (3,414)  
Amortization (598) (552)  
Dispositions, retirements and other (387) (265)  
Balance at end of the period (3,912) (3,701)  
Intangible assets subject to amortization      
intangible assets and goodwill      
Balance at beginning of the period 1,965    
Balance at end of the period 2,262 1,965  
Intangible assets subject to amortization | Cost/Gross amount      
intangible assets and goodwill      
Balance at beginning of the period 5,666 5,085  
Additions 656 617  
Additions arising from business acquisitions 238 235  
Dispositions, retirements and other (385) (271)  
Net foreign exchange differences (1)    
Balance at end of the period 6,174 5,666  
Intangible assets subject to amortization | Accumulated amortization      
intangible assets and goodwill      
Balance at beginning of the period (3,701) (3,414)  
Amortization (598) (552)  
Dispositions, retirements and other (387) (265)  
Balance at end of the period (3,912) (3,701)  
Customer contracts, related customer relationships and leasehold interests      
intangible assets and goodwill      
Balance at beginning of the period 248    
Balance at end of the period 412 248  
Customer contracts, related customer relationships and leasehold interests | Cost/Gross amount      
intangible assets and goodwill      
Balance at beginning of the period 558 485  
Additions arising from business acquisitions 219 134  
Dispositions, retirements and other (138) (61)  
Net foreign exchange differences (1)    
Balance at end of the period 638 558  
Customer contracts, related customer relationships and leasehold interests | Accumulated amortization      
intangible assets and goodwill      
Balance at beginning of the period (310) (323)  
Amortization (56) (48)  
Dispositions, retirements and other (140) (61)  
Balance at end of the period (226) (310)  
Software      
intangible assets and goodwill      
Balance at beginning of the period 1,337    
Balance at end of the period 1,471 1,337  
Software | Cost/Gross amount      
intangible assets and goodwill      
Balance at beginning of the period 4,667 4,295  
Additions 69 74  
Additions arising from business acquisitions 19 101  
Dispositions, retirements and other (248) (209)  
Assets under construction put into service 585 406  
Balance at end of the period 5,092 4,667  
Software | Accumulated amortization      
intangible assets and goodwill      
Balance at beginning of the period (3,330) (3,032)  
Amortization (538) (500)  
Dispositions, retirements and other (247) (202)  
Balance at end of the period (3,621) (3,330)  
Access to rights-of-way and other      
intangible assets and goodwill      
Balance at beginning of the period 36    
Balance at end of the period 38 36  
Access to rights-of-way and other | Cost/Gross amount      
intangible assets and goodwill      
Balance at beginning of the period 97 93  
Additions 5 5  
Dispositions, retirements and other 1 (1)  
Balance at end of the period 103 97  
Access to rights-of-way and other | Accumulated amortization      
intangible assets and goodwill      
Balance at beginning of the period (61) (59)  
Amortization (4) (4)  
Dispositions, retirements and other   (2)  
Balance at end of the period (65) (61)  
Assets under construction      
intangible assets and goodwill      
Balance at beginning of the period 344    
Balance at end of the period 341 344  
Assets under construction | Cost/Gross amount      
intangible assets and goodwill      
Balance at beginning of the period 344 212  
Additions 582 538  
Assets under construction put into service (585) (406)  
Balance at end of the period 341 344  
Goodwill      
intangible assets and goodwill      
Balance at beginning of the period 4,236    
Balance at end of the period 4,733 4,236  
Goodwill | Cost/Gross amount      
intangible assets and goodwill      
Balance at beginning of the period 4,600 4,151  
Additions arising from business acquisitions 456 452  
Net foreign exchange differences 41 (3)  
Balance at end of the period 5,097 4,600  
Goodwill | Accumulated amortization      
intangible assets and goodwill      
Balance at beginning of the period (364) (364)  
Balance at end of the period $ (364) $ (364)