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Goodwill - Changes in carrying amounts of goodwill (Details) - CAD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of changes in intangible assets and goodwill [abstract]
Goodwill at beginning of period	$ 10,604
Goodwill, end of period	10,572	$ 10,604
Discontinued operations
Reconciliation of changes in intangible assets and goodwill [abstract]
Goodwill at beginning of period	115
Goodwill, end of period		115
BELL WIRELESS
Reconciliation of changes in intangible assets and goodwill [abstract]
Goodwill at beginning of period	3,046
Goodwill, end of period	3,046	3,046
BELL WIRELINE
Reconciliation of changes in intangible assets and goodwill [abstract]
Goodwill at beginning of period	4,612
Goodwill, end of period	4,580	4,612
BELL MEDIA
Reconciliation of changes in intangible assets and goodwill [abstract]
Goodwill at beginning of period	2,946
Goodwill, end of period	2,946	2,946
Goodwill
Reconciliation of changes in intangible assets and goodwill [abstract]
Goodwill at beginning of period		10,667
Acquisitions and other	(26)	52
Reclassified to assets held for sale	(6)
Goodwill, end of period	10,572
Goodwill | Discontinued operations
Reconciliation of changes in intangible assets and goodwill [abstract]
Discontinued operations		(115)
Goodwill | BELL WIRELESS
Reconciliation of changes in intangible assets and goodwill [abstract]
Goodwill at beginning of period	3,046	3,046
Acquisitions and other	0	0
Reclassified to assets held for sale	0
Goodwill, end of period		3,046
Goodwill | BELL WIRELESS | Discontinued operations
Reconciliation of changes in intangible assets and goodwill [abstract]
Discontinued operations		0
Goodwill | BELL WIRELINE
Reconciliation of changes in intangible assets and goodwill [abstract]
Goodwill at beginning of period	4,612	4,675
Acquisitions and other	(26)	52
Reclassified to assets held for sale	(6)
Goodwill, end of period		4,612
Goodwill | BELL WIRELINE | Discontinued operations
Reconciliation of changes in intangible assets and goodwill [abstract]
Discontinued operations		(115)
Goodwill | BELL MEDIA
Reconciliation of changes in intangible assets and goodwill [abstract]
Goodwill at beginning of period	2,946	2,946
Acquisitions and other	0	0
Reclassified to assets held for sale	$ 0
Goodwill, end of period		2,946
Goodwill | BELL MEDIA | Discontinued operations
Reconciliation of changes in intangible assets and goodwill [abstract]
Discontinued operations		$ 0

X

- Definition

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

+ References

No definition available.

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X

- Definition

The increase (decrease) in goodwill. [Refer: Goodwill]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 3
-IssueDate 2021-01-01
-Paragraph B67
-Subparagraph d
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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
-Name IAS
-Number 38
-IssueDate 2021-01-01
-Paragraph 118
-Subparagraph e
-Clause ii
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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: Business combinations [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-URIDate 2021-03-24

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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-IssueDate 2021-01-01
-Paragraph 54
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_54_c&doctype=Standard
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