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v3.20.4

Significant accounting policies - Post-Employment Benefit Plans (Details) | 12 Months Ended
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Dec. 31, 2020
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

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- 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

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- 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

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain 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

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