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

Explanation Of Period Over Which Management Has Projected Cash Flows, Period

No definition available.

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