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intangible assets and goodwill (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
intangible assets and goodwill    
Balance at beginning of the period $ 18,153  
Amortization 905 $ 648
Balance at end of the period 22,261 18,153
Accumulated impairment losses of goodwill 7,235 5,307
Contractual commitments for the acquisition of intangible assets 56 45
Cost/Gross amount    
intangible assets and goodwill    
Balance at beginning of the period 22,901 19,957
Additions 640 1,877
Additions arising from business acquisitions 4,260 1,253
Dispositions, retirements and other (398) (145)
Net foreign exchange differences 87 (41)
Balance at end of the period 27,490 22,901
Accumulated amortization    
intangible assets and goodwill    
Balance at beginning of the period (4,748) (4,276)
Amortization 905 648
Dispositions, retirements and other 428 176
Net foreign exchange differences (4)  
Balance at end of the period (5,229) (4,748)
Allowance for doubtful accounts    
intangible assets and goodwill    
Accumulated impairment losses of goodwill 0  
Spectrum licences    
intangible assets and goodwill    
Balance at beginning of the period 9,937  
Balance at end of the period 9,910 9,937
Spectrum licences | Cost/Gross amount    
intangible assets and goodwill    
Balance at beginning of the period 9,937 8,694
Additions   1,217
Additions arising from business acquisitions 9  
Dispositions, retirements and other (36) 26
Balance at end of the period 9,910 9,937
Total intangible assets    
intangible assets and goodwill    
Balance at beginning of the period 12,846  
Balance at end of the period 15,026 12,846
Total intangible assets | Cost/Gross amount    
intangible assets and goodwill    
Balance at beginning of the period 17,230 14,846
Additions 640 1,877
Additions arising from business acquisitions 2,373 660
Dispositions, retirements and other (398) (145)
Net foreign exchange differences 46 (8)
Balance at end of the period 19,891 17,230
Total intangible assets | Accumulated amortization    
intangible assets and goodwill    
Balance at beginning of the period (4,384) (3,912)
Amortization 905 648
Dispositions, retirements and other 428 176
Net foreign exchange differences (4)  
Balance at end of the period (4,865) (4,384)
Intangible assets subject to amortization    
intangible assets and goodwill    
Balance at beginning of the period 2,909  
Balance at end of the period 5,116 2,909
Intangible assets subject to amortization | Cost/Gross amount    
intangible assets and goodwill    
Balance at beginning of the period 7,293 6,152
Additions 640 660
Additions arising from business acquisitions 2,364 660
Dispositions, retirements and other (362) (171)
Net foreign exchange differences 46 (8)
Balance at end of the period 9,981 7,293
Intangible assets subject to amortization | Accumulated amortization    
intangible assets and goodwill    
Balance at beginning of the period (4,384) (3,912)
Amortization 905 648
Dispositions, retirements and other 428 176
Net foreign exchange differences (4)  
Balance at end of the period (4,865) (4,384)
Customer contracts, related customer relationships and leasehold interests    
intangible assets and goodwill    
Balance at beginning of the period 747  
Balance at end of the period 2,420 747
Customer contracts, related customer relationships and leasehold interests | Cost/Gross amount    
intangible assets and goodwill    
Balance at beginning of the period 1,032 616
Additions arising from business acquisitions 1,736 453
Dispositions, retirements and other 100 (29)
Net foreign exchange differences 47 (8)
Balance at end of the period 2,915 1,032
Customer contracts, related customer relationships and leasehold interests | Accumulated amortization    
intangible assets and goodwill    
Balance at beginning of the period (285) (226)
Amortization 215 70
Dispositions, retirements and other 10 11
Net foreign exchange differences (5)  
Balance at end of the period (495) (285)
Software    
intangible assets and goodwill    
Balance at beginning of the period 1,842  
Balance at end of the period 2,205 1,842
Software | Cost/Gross amount    
intangible assets and goodwill    
Balance at beginning of the period 5,870 5,092
Additions 88 60
Additions arising from business acquisitions 357 205
Dispositions, retirements and other (421) (166)
Assets under construction put into service 586 679
Net foreign exchange differences (1)  
Balance at end of the period 6,479 5,870
Software | Accumulated amortization    
intangible assets and goodwill    
Balance at beginning of the period (4,028) (3,621)
Amortization 671 573
Dispositions, retirements and other 424 166
Net foreign exchange differences 1  
Balance at end of the period (4,274) (4,028)
Access to rights-of-way, crowdsource assets and other    
intangible assets and goodwill    
Balance at beginning of the period 66  
Balance at end of the period 275 66
Access to rights-of-way, crowdsource assets and other | Cost/Gross amount    
intangible assets and goodwill    
Balance at beginning of the period 137 103
Additions 4 8
Additions arising from business acquisitions 271 2
Dispositions, retirements and other (41) 24
Balance at end of the period 371 137
Access to rights-of-way, crowdsource assets and other | Accumulated amortization    
intangible assets and goodwill    
Balance at beginning of the period (71) (65)
Amortization 19 5
Dispositions, retirements and other (6) (1)
Balance at end of the period (96) (71)
Assets under construction    
intangible assets and goodwill    
Balance at beginning of the period 254  
Balance at end of the period 216 254
Assets under construction | Cost/Gross amount    
intangible assets and goodwill    
Balance at beginning of the period 254 341
Additions 548 592
Assets under construction put into service (586) (679)
Balance at end of the period 216 254
Goodwill    
intangible assets and goodwill    
Balance at beginning of the period 5,307  
Balance at end of the period 7,235 5,307
Goodwill | Cost/Gross amount    
intangible assets and goodwill    
Balance at beginning of the period 5,671 5,111
Additions arising from business acquisitions 1,887 593
Net foreign exchange differences 41 (33)
Balance at end of the period 7,599 5,671
Goodwill | Accumulated amortization    
intangible assets and goodwill    
Balance at beginning of the period (364) (364)
Balance at end of the period $ (364) $ (364)