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Goodwill - Changes in carrying amounts of goodwill (Details) - Goodwill - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Reconciliation of changes in intangible assets and goodwill [abstract]
Goodwill at beginning of period	$ 10,942	$ 10,906
Acquisitions, disposition and other	451	58
Reclassified to assets held for sale		(22)
Impairment loss recognised in profit or loss, goodwill	(1,132)
Goodwill, end of period	10,261	10,942
Bell CTS
Reconciliation of changes in intangible assets and goodwill [abstract]
Goodwill at beginning of period	8,099	7,960
Acquisitions, disposition and other	167	139
Reclassified to assets held for sale		0
Impairment loss recognised in profit or loss, goodwill	0
Goodwill, end of period	8,266	8,099
Bell Media
Reconciliation of changes in intangible assets and goodwill [abstract]
Goodwill at beginning of period	2,843	2,946
Acquisitions, disposition and other	284	(81)
Reclassified to assets held for sale		(22)
Impairment loss recognised in profit or loss, goodwill	(1,132)
Goodwill, end of period	$ 1,995	$ 2,843

X

- Definition

Acquisitions Through Business Combinations, Disposals And Increase (Decrease) Through Other Changes, Intangible Assets And Goodwill

+ References

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- Definition

The decrease in intangible assets and goodwill resulting from classification as held for sale or inclusion in a disposal group classified as held for sale. [Refer: Disposal groups classified as held for sale [member]; Intangible assets and goodwill]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-Number 38
-IssueDate 2024-01-01
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- Definition

The amount of assets representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognised. [Refer: Total for all business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The amount of impairment loss recognised in profit or loss for goodwill. [Refer: Impairment loss recognised in profit or loss; Goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
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