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Segmented information - Revenue by Services and Products (Details) - CAD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Disclosure of products and services [line items]        
Operating revenues $ 6,176 $ 6,085 $ 12,344 $ 12,015
Wireless voice and data        
Disclosure of products and services [line items]        
Operating revenues 1,725 1,768 3,453 3,517
Wireline data        
Disclosure of products and services [line items]        
Operating revenues 2,222 2,025 4,427 4,039
Wireline data | U.S | Bell CTS        
Disclosure of products and services [line items]        
Operating revenues 197   392  
Wireline voice        
Disclosure of products and services [line items]        
Operating revenues 622 624 1,258 1,253
Wireline voice | U.S | Bell CTS        
Disclosure of products and services [line items]        
Operating revenues 34   70  
Media        
Disclosure of products and services [line items]        
Operating revenues 849 773 1,561 1,474
Other wireline services        
Disclosure of products and services [line items]        
Operating revenues 73 77 142 156
Other wireline services | U.S | Bell CTS        
Disclosure of products and services [line items]        
Operating revenues 3   6  
Total services        
Disclosure of products and services [line items]        
Operating revenues 5,491 5,267 10,841 10,439
Wireless        
Disclosure of products and services [line items]        
Operating revenues 555 594 1,140 1,218
Wireline        
Disclosure of products and services [line items]        
Operating revenues 130 224 363 358
Total products        
Disclosure of products and services [line items]        
Operating revenues $ 685 $ 818 $ 1,503 $ 1,576