v3.26.1
owners' equity - Subsidiaries with significant non-controlling interests (Details) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Dec. 31, 2025
Jun. 30, 2025
Statement of financial position              
Current assets $ 7,105   $ 7,105   $ 7,105 $ 8,372  
Non-current assets 49,707   49,707   49,707 51,241  
Current liabilities 10,679   10,679   10,679 9,689  
Non-current liabilities 32,044   32,044   32,044 33,345  
Non-controlling interests 808 $ 882 808 $ 882 808 804 $ 882
Statement of income and other comprehensive income              
Net income (loss) (1,830) (245) (1,686) 56      
Comprehensive income (loss) (1,883) (296) (1,690) 57      
Net income (loss) allocated to non-controlling interest 10 (252) 18 (272)      
Comprehensive income (loss) allocated to non-controlling interest 10 (306) 18 (317)      
Statement of cash flows              
Cash provided by operating activities 1,342 1,166 2,392 2,243 5,015   $ 4,752
Cash used by investing activities (672) (1,093) (1,816) (1,695)      
Cash provided (used) by financing activities (585) 2,595 (1,810) 2,265      
Partnership distributions to non-controlling interest (included as a use of cash in financing activities) 9   14        
Property, plant and equipment 775 796 1,422 1,397      
Change in associated non-cash investing working capital 81 80 (25) 13      
Telus International (Cda) Inc.              
Statement of income and other comprehensive income              
Revenue and other income   966   1,928      
Net income (loss)   (376)   (411)      
Comprehensive income (loss)   (504)   (516)      
Net income (loss) allocated to non-controlling interest   (252)   (272)      
Other comprehensive income allocated to non-controlling interest   (54)   (45)      
Comprehensive income (loss) allocated to non-controlling interest   (306)   (317)      
Statement of cash flows              
Cash provided by operating activities   43   102      
Cash used by investing activities   (43)   (82)      
Cash provided (used) by financing activities   $ 8   $ (68)      
Terrion wireless tower infrastructure              
Statement of financial position              
Current assets 55   55   55 33  
Non-current assets 776   776   776 658  
Current liabilities 47   47   47 37  
Non-current liabilities 420   420   420 314  
Non-controlling interests 801   801   $ 801 $ 799  
Statement of income and other comprehensive income              
Revenue and other income 46   92        
Net income (loss) 16   32        
Comprehensive income (loss) 16   32        
Net income (loss) allocated to non-controlling interest 8   16        
Statement of cash flows              
Cash provided by operating activities 36   69        
Cash used by investing activities (23)   (33)        
Cash provided (used) by financing activities (12)   (28)        
Partnership distributions to non-controlling interest (included as a use of cash in financing activities) 9   14        
Period from date of establishment for privatization           160 days  
Property, plant and equipment 19   28        
Change in associated non-cash investing working capital $ (4)   $ (9)