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Related party transactions - Narrative (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Associates and Joint Arrangements
Disclosure of transactions between related parties [line items]
Recognized revenue, related parties	$ 9	$ 12
Incurred expenses, related parties	150	200
Master Trust Fund | Bell Canada
Disclosure of transactions between related parties [line items]
Recognized revenue, related parties	$ 14	$ 15

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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- Definition

The amount of revenue arising from the rendering of services in related party transactions. [Refer: Revenue; Total for all related parties [member]]

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The amount of services received in related party transactions. [Refer: Total for all related parties [member]]

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