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Business acquisition and disposition - Narrative (Details)
$ in Millions, $ in Millions
3 Months Ended 6 Months Ended
Aug. 01, 2025
CAD ($)
Jun. 30, 2026
CAD ($)
Jun. 30, 2025
CAD ($)
Jun. 30, 2026
CAD ($)
Jun. 30, 2025
CAD ($)
Mar. 26, 2026
CAD ($)
Aug. 01, 2025
USD ($)
Disclosure of detailed information about business combination [line items]              
Severance, acquisition and other costs   $ 50 $ 41 $ 44 $ 288    
Disposition of land           $ 675  
Ziply Fiber              
Disclosure of detailed information about business combination [line items]              
Consideration recognized as of acquisition date $ 5,010           $ 3,640
Severance, acquisition and other costs $ 81