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Related party transactions - Narrative (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2025 | Dec. 31, 2024
Associates and Joint Ventures |  |
Disclosure of transactions between related parties [line items] |  |
Recognized revenue, related parties | $ 16 | $ 9
Incurred expenses, related parties | 145 | 150
Master Trust Fund | Bell Canada |  |
Disclosure of transactions between related parties [line items] |  |
Recognized revenue, related parties | $ 14 | $ 14

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