Related party transactions - Summary of Significant Subsidiaries (Details) - SUBSIDIARY	12 Months Ended
Dec. 31, 2021	Dec. 31, 2020
Bell Canada
Disclosure of transactions between related parties [line items]
OWNERSHIP PERCENTAGE	100.00%	100.00%
Bell Mobility Inc.
Disclosure of transactions between related parties [line items]
OWNERSHIP PERCENTAGE	100.00%	100.00%
Bell Media Inc.
Disclosure of transactions between related parties [line items]
OWNERSHIP PERCENTAGE	100.00%	100.00%

The proportion of ownership interest in a subsidiary attributable to the entity. [Refer: Subsidiaries [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2021-01-01
-Paragraph 17
-Subparagraph b
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-URIDate 2021-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 27
-IssueDate 2021-01-01
-Paragraph 16
-Subparagraph b
-Clause iii
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-URIDate 2021-03-24

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 12
-IssueDate 2021-01-01
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Namespace Prefix:	ifrs-full_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration