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Debt due within one year - Details of Securitized Trade Receivables (Details) - CAD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Financial Instruments [Abstract]
Average interest rate throughout the year	5.72%	3.15%
Securitized receivables	$ 3,320	$ 3,353

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- Definition

Current Securitised Trade Receivables

+ References

No definition available.

+ Details

Name:	bce_CurrentSecuritisedTradeReceivables
Namespace Prefix:	bce_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Financial Instruments [Abstract]

+ References

No definition available.

+ Details

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

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- Definition

Securitised Trade Receivables, Average Interest Rate During Period

+ References

No definition available.

+ Details

Name:	bce_SecuritisedTradeReceivablesAverageInterestRateDuringPeriod
Namespace Prefix:	bce_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	instant