v3.26.1
intangible assets and goodwill (Details)
$ in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
CAD ($)
Mar. 31, 2026
CAD ($)
item
Jun. 30, 2025
CAD ($)
Jun. 30, 2026
CAD ($)
Jun. 30, 2025
CAD ($)
Jun. 30, 2026
USD ($)
Dec. 31, 2025
CAD ($)
intangible assets and goodwill              
Balance at beginning of the period   $ 30,788   $ 30,788      
Amortization $ 434   $ 403 839 $ 803    
Impairment 2,135   $ 500 2,135 500    
Balance at end of the period 28,825     28,825      
Contractual commitments for the acquisition of intangible assets 125     125     $ 70
AT COST              
intangible assets and goodwill              
Balance at beginning of the period   41,002   41,002      
Additions       897      
Assets under construction put into service            
Dispositions, retirements and other (including capitalized interest)       (519)      
Net foreign exchange differences       191      
Balance at end of the period 41,571     41,571      
ACCUMULATED AMORTIZATION              
intangible assets and goodwill              
Balance at beginning of the period   (10,214)   (10,214)      
Amortization       (839)      
Impairment       2,135      
Dispositions, retirements and other (including capitalized interest)       (511)      
Net foreign exchange differences       69      
Balance at end of the period (12,746)     (12,746)      
Spectrum licences              
intangible assets and goodwill              
Balance at beginning of the period   $ 13,217   13,217      
Balance at end of the period 13,590     13,590      
Spectrum licences | Spectrum License Auction              
intangible assets and goodwill              
Number of spectrum licenses purchased | item   103          
Intangible assets subject to amortization   $ 318          
Spectrum licences | AT COST              
intangible assets and goodwill              
Balance at beginning of the period   13,217   13,217      
Additions       373      
Balance at end of the period 13,590     13,590      
Spectrum Licences 2500 MHz and 3500 MHz              
intangible assets and goodwill              
Intangible assets subject to amortization           $ 55  
Total intangible assets              
intangible assets and goodwill              
Balance at beginning of the period   20,328   20,328      
Balance at end of the period 19,928     19,928      
Total intangible assets | AT COST              
intangible assets and goodwill              
Balance at beginning of the period   29,677   29,677      
Additions       897      
Dispositions, retirements and other (including capitalized interest)       (519)      
Net foreign exchange differences       88      
Balance at end of the period 30,143     30,143      
Total intangible assets | ACCUMULATED AMORTIZATION              
intangible assets and goodwill              
Balance at beginning of the period   (9,349)   (9,349)      
Amortization       (839)      
Impairment       500      
Dispositions, retirements and other (including capitalized interest)       (511)      
Net foreign exchange differences       38      
Balance at end of the period (10,215)     (10,215)      
Intangible assets subject to amortization              
intangible assets and goodwill              
Balance at beginning of the period   7,111   7,111      
Balance at end of the period 6,338     6,338      
Intangible assets subject to amortization | AT COST              
intangible assets and goodwill              
Balance at beginning of the period   16,460   16,460      
Additions       524      
Dispositions, retirements and other (including capitalized interest)       (519)      
Net foreign exchange differences       88      
Balance at end of the period 16,553     16,553      
Intangible assets subject to amortization | ACCUMULATED AMORTIZATION              
intangible assets and goodwill              
Balance at beginning of the period   (9,349)   (9,349)      
Amortization       (839)      
Impairment       500      
Dispositions, retirements and other (including capitalized interest)       (511)      
Net foreign exchange differences       38      
Balance at end of the period (10,215)     (10,215)      
Customer contracts, related customer relationships and leasehold interests              
intangible assets and goodwill              
Balance at beginning of the period   3,459   3,459      
Balance at end of the period 2,717     2,717      
Customer contracts, related customer relationships and leasehold interests | AT COST              
intangible assets and goodwill              
Balance at beginning of the period   5,962   5,962      
Assets under construction put into service       20      
Dispositions, retirements and other (including capitalized interest)       (249)      
Net foreign exchange differences       70      
Balance at end of the period 5,803     5,803      
Customer contracts, related customer relationships and leasehold interests | ACCUMULATED AMORTIZATION              
intangible assets and goodwill              
Balance at beginning of the period   (2,503)   (2,503)      
Amortization       (313)      
Impairment       500      
Dispositions, retirements and other (including capitalized interest)       (260)      
Net foreign exchange differences       30      
Balance at end of the period (3,086)     (3,086)      
Software              
intangible assets and goodwill              
Balance at beginning of the period   2,863   2,863      
Balance at end of the period 2,805     2,805      
Software | AT COST              
intangible assets and goodwill              
Balance at beginning of the period   9,396   9,396      
Additions       55      
Assets under construction put into service       384      
Dispositions, retirements and other (including capitalized interest)       (249)      
Net foreign exchange differences       5      
Balance at end of the period 9,591     9,591      
Software | ACCUMULATED AMORTIZATION              
intangible assets and goodwill              
Balance at beginning of the period   (6,533)   (6,533)      
Amortization       (498)      
Dispositions, retirements and other (including capitalized interest)       (247)      
Net foreign exchange differences       2      
Balance at end of the period (6,786)     (6,786)      
Access to rights-of-way, crowdsource assets and other              
intangible assets and goodwill              
Balance at beginning of the period   272   272      
Balance at end of the period 261     261      
Access to rights-of-way, crowdsource assets and other | AT COST              
intangible assets and goodwill              
Balance at beginning of the period   585   585      
Additions       30      
Dispositions, retirements and other (including capitalized interest)       (21)      
Net foreign exchange differences       10      
Balance at end of the period 604     604      
Access to rights-of-way, crowdsource assets and other | ACCUMULATED AMORTIZATION              
intangible assets and goodwill              
Balance at beginning of the period   (313)   (313)      
Amortization       (28)      
Dispositions, retirements and other (including capitalized interest)       (4)      
Net foreign exchange differences       6      
Balance at end of the period (343)     (343)      
Assets under construction              
intangible assets and goodwill              
Balance at beginning of the period   517   517      
Balance at end of the period 555     555      
Assets under construction | AT COST              
intangible assets and goodwill              
Balance at beginning of the period   517   517      
Additions       439      
Assets under construction put into service       (404)      
Net foreign exchange differences       3      
Balance at end of the period 555     555      
Goodwill              
intangible assets and goodwill              
Balance at beginning of the period   10,460   10,460      
Balance at end of the period 8,897     8,897      
Goodwill | AT COST              
intangible assets and goodwill              
Balance at beginning of the period   11,325   11,325      
Net foreign exchange differences       103      
Balance at end of the period 11,428     11,428      
Goodwill | ACCUMULATED AMORTIZATION              
intangible assets and goodwill              
Balance at beginning of the period   $ (865)   (865) $ (364)    
Impairment       1,635      
Net foreign exchange differences       31      
Balance at end of the period $ (2,531)     $ (2,531)