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intangible assets and goodwill (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
CAD ($)
item
Dec. 31, 2023
CAD ($)
intangible assets and goodwill    
Balance at beginning of the period $ 29,779  
Amortization 1,523 $ 1,555
Balance at end of the period 31,137 29,779
Accumulated impairment losses of goodwill 0  
Contractual commitments for the acquisition of intangible assets 37 25
Cash payments for spectrum licences 637 29
Cost/Gross amount    
intangible assets and goodwill    
Balance at beginning of the period 37,059 34,754
Additions 1,984 1,010
Additions arising from business acquisitions 546 1,972
Dispositions, retirements and other (including capitalized interest) 346 (580)
Net foreign exchange differences 358 (97)
Balance at end of the period 39,601 37,059
Accumulated amortization    
intangible assets and goodwill    
Balance at beginning of the period (7,280) (6,384)
Amortization (1,523) (1,555)
Dispositions, retirements and other (including capitalized interest) (390) (653)
Net foreign exchange differences 51 (6)
Balance at end of the period (8,464) (7,280)
Spectrum licences    
intangible assets and goodwill    
Balance at beginning of the period 12,250  
Balance at end of the period 13,206 12,250
Spectrum licences | Cost/Gross amount    
intangible assets and goodwill    
Balance at beginning of the period 12,250 12,215
Additions 936 29
Dispositions, retirements and other (including capitalized interest) (20) 6
Balance at end of the period $ 13,206 12,250
Spectrum Licences 3800 Mhz    
intangible assets and goodwill    
Number of spectrum licenses purchased | item 1,430  
Intangible assets subject to amortization $ 620  
Percentage of total purchase price remitted as per terms of the auction 20.00%  
Amount remitted per terms of the auction $ 124  
AWS - 4 spectrum    
intangible assets and goodwill    
Cash payments for spectrum licences 17  
Long term liability for spectrum license 298  
Total intangible assets    
intangible assets and goodwill    
Balance at beginning of the period 19,721  
Balance at end of the period 20,593 19,721
Total intangible assets | Cost/Gross amount    
intangible assets and goodwill    
Balance at beginning of the period 26,637 25,259
Additions 1,984 1,010
Additions arising from business acquisitions 227 997
Dispositions, retirements and other (including capitalized interest) 346 (580)
Net foreign exchange differences 191 (49)
Balance at end of the period 28,693 26,637
Total intangible assets | Accumulated amortization    
intangible assets and goodwill    
Balance at beginning of the period (6,916) (6,020)
Amortization (1,523) (1,555)
Dispositions, retirements and other (including capitalized interest) (390) (653)
Net foreign exchange differences 51 (6)
Balance at end of the period (8,100) (6,916)
Intangible assets subject to amortization    
intangible assets and goodwill    
Balance at beginning of the period 7,471  
Balance at end of the period 7,387 7,471
Intangible assets subject to amortization | Cost/Gross amount    
intangible assets and goodwill    
Balance at beginning of the period 14,387 13,044
Additions 1,048 981
Additions arising from business acquisitions 227 997
Dispositions, retirements and other (including capitalized interest) 366 (586)
Net foreign exchange differences 191 (49)
Balance at end of the period 15,487 14,387
Intangible assets subject to amortization | Accumulated amortization    
intangible assets and goodwill    
Balance at beginning of the period (6,916) (6,020)
Amortization (1,523) (1,555)
Dispositions, retirements and other (including capitalized interest) (390) (653)
Net foreign exchange differences 51 (6)
Balance at end of the period (8,100) (6,916)
Customer contracts, related customer relationships and subscriber base    
intangible assets and goodwill    
Balance at beginning of the period 3,827  
Balance at end of the period 3,699 3,827
Customer contracts, related customer relationships and subscriber base | Cost/Gross amount    
intangible assets and goodwill    
Balance at beginning of the period 5,360 4,489
Additions 35  
Additions arising from business acquisitions 191 866
Dispositions, retirements and other (including capitalized interest) 3 47
Net foreign exchange differences 159 (42)
Balance at end of the period 5,742 5,360
Customer contracts, related customer relationships and subscriber base | Accumulated amortization    
intangible assets and goodwill    
Balance at beginning of the period (1,533) (1,082)
Amortization (473) (473)
Dispositions, retirements and other (including capitalized interest) 1 (18)
Net foreign exchange differences 36 (4)
Balance at end of the period (2,043) (1,533)
Software    
intangible assets and goodwill    
Balance at beginning of the period 2,779  
Balance at end of the period 2,879 2,779
Software | Cost/Gross amount    
intangible assets and goodwill    
Balance at beginning of the period 7,915 7,522
Additions 107 119
Additions arising from business acquisitions 31  
Assets under construction put into service 921 845
Dispositions, retirements and other (including capitalized interest) 331 (570)
Net foreign exchange differences 6 (1)
Balance at end of the period 8,649 7,915
Software | Accumulated amortization    
intangible assets and goodwill    
Balance at beginning of the period (5,136) (4,713)
Amortization (959) (995)
Dispositions, retirements and other (including capitalized interest) (330) (571)
Net foreign exchange differences 5 (1)
Balance at end of the period (5,770) (5,136)
Access to rights-of-way, crowdsource assets and other    
intangible assets and goodwill    
Balance at beginning of the period 335  
Balance at end of the period 335 335
Access to rights-of-way, crowdsource assets and other | Cost/Gross amount    
intangible assets and goodwill    
Balance at beginning of the period 582 498
Additions 41 5
Additions arising from business acquisitions 5 131
Assets under construction put into service   17
Dispositions, retirements and other (including capitalized interest) 32 (63)
Net foreign exchange differences 26 (6)
Balance at end of the period 622 582
Access to rights-of-way, crowdsource assets and other | Accumulated amortization    
intangible assets and goodwill    
Balance at beginning of the period (247) (225)
Amortization (91) (87)
Dispositions, retirements and other (including capitalized interest) (61) (64)
Net foreign exchange differences 10 (1)
Balance at end of the period (287) (247)
Assets under construction.    
intangible assets and goodwill    
Balance at beginning of the period 530  
Balance at end of the period 474 530
Assets under construction. | Cost/Gross amount    
intangible assets and goodwill    
Balance at beginning of the period 530 535
Additions 865 857
Assets under construction put into service (921) (862)
Balance at end of the period 474 530
Goodwill    
intangible assets and goodwill    
Balance at beginning of the period 10,058  
Balance at end of the period 10,544 10,058
Goodwill | Cost/Gross amount    
intangible assets and goodwill    
Balance at beginning of the period 10,422 9,495
Additions arising from business acquisitions 319 975
Net foreign exchange differences 167 (48)
Balance at end of the period 10,908 10,422
Goodwill | Accumulated amortization    
intangible assets and goodwill    
Balance at beginning of the period (364) (364)
Balance at end of the period $ (364) $ (364)