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Debt due within one year - Details of Securitized Trade Receivables (Details) - CAD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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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

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- 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