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Debt due within one year - Details of Securitized Trade Receivables (Details) - CAD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Financial Instruments [Abstract] |  |
Average interest rate throughout the year | 5.50% | 5.72%
Securitized receivables | $ 3,405 | $ 3,320
Maximum amount still available under our securitization program | $ 2,300 | $ 2,300

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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

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- Definition Securitized Trade Receivables, Maximum Amount Available + References No definition available. + Details
Name: | bce_SecuritizedTradeReceivablesMaximumAmountAvailable
Namespace Prefix: | bce_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant