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Goodwill - Narrative (Details) | 12 Months Ended
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Dec. 31, 2021
Intangible Assets [Abstract] |
Explanation of period over which management has projected cash flows, period | 5 years

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- Definition Explanation Of Period Over Which Management Has Projected Cash Flows, 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 Intangible Assets [Abstract] + References No definition available. + Details
Name: | bce_IntangibleAssetsAbstract
Namespace Prefix: | bce_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration