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Material accounting policies - Revenue from Contracts with Customers (Details) | 12 Months Ended
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Dec. 31, 2023
Residential customers | Bell Wireless |
Disclosure of performance obligations [line items] |
Contract with customer, significant payment terms, duration | 24 months
Business customers | Bell Wireless |
Disclosure of performance obligations [line items] |
Contract with customer, significant payment terms, duration | 36 months
Business customers | Bell Wireline |
Disclosure of performance obligations [line items] |
Contract with customer, significant payment terms, duration | 7 years

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- Definition Contract With Customer, Significant Payment Terms, Duration + References No definition available. + Details
Name: | bce_ContractWithCustomerSignificantPaymentTermsDuration
Namespace Prefix: | bce_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table. + References No definition available. + Details
Name: | ifrs-full_DisclosureOfPerformanceObligationsLineItems
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_MajorCustomersAxis=bce_ResidentialCustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | ifrs-full_SegmentsAxis=bce_BellWirelessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MajorCustomersAxis=bce_BusinessCustomersMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_SegmentsAxis=bce_BellWirelineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |