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Segmented information - Narrative (Details) - segment	Jun. 30, 2026	Jun. 30, 2025
Operating Segments [Abstract]
Number of reportable segments	3	2

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- Definition

Number Of Reportable Segments

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

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- Definition

Operating Segments [Abstract]

+ References

No definition available.

+ Details

Name:	bce_OperatingSegmentsAbstract
Namespace Prefix:	bce_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration