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Significant accounting policies - Post-Employment Benefit Plans (Details)	12 Months Ended
	Dec. 31, 2022
Disclosure of defined benefit plans [line items]
Actuarial valuation, frequency period	3 years
DB pension
Disclosure of defined benefit plans [line items]
Highest paid consecutive period of service	5 years

X

- Definition

Defined Benefit Plan, Actuarial Valuation, Frequency Period

+ References

No definition available.

+ Details

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Namespace Prefix:	bce_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Defined Benefit Plan, Highest Paid Consecutive Period Of Service

+ References

No definition available.

+ Details

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Namespace Prefix:	bce_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- 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.

+ References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	ifrs-full_DefinedBenefitPlansAxis=bce_PensionPlansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: