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Debt (Details) $ in Millions, $ in Millions |  |  |  |  | 3 Months Ended | 6 Months Ended |  |  |  |  |
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Jun. 05, 2026 CAD ($) | Jun. 05, 2026 USD ($) | Apr. 13, 2026 CAD ($) | Apr. 13, 2026 USD ($) | Feb. 12, 2026 CAD ($) | Jan. 28, 2026 CAD ($) | Jan. 28, 2026 USD ($) | Jun. 30, 2026 CAD ($) | Jun. 30, 2025 CAD ($) | Jun. 30, 2026 CAD ($) | Jun. 30, 2025 CAD ($) | Jun. 05, 2026 USD ($) | Jun. 03, 2026 CAD ($) | Apr. 13, 2026 USD ($) | Mar. 30, 2026 CAD ($) | Apr. 14, 2025 CAD ($) | Apr. 14, 2025 USD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net early debt redemption gains | [1] |  |  |  |  |  |  |  | $ 89 | $ 91 | $ 89 | $ 357 |  |  |  |  |  |
Repayments of lease liabilities |  |  |  |  |  |  |  |  | $ 258 | $ 278 | $ 499 | $ 582 |  |  |  |  |  |
Debt Repurchase, Tranche Two |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early repayments of non-current borrowings |  | $ 1,422 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Repurchase, Tranche One |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Early repayments of non-current borrowings |  | 963 | $ 692 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series US-11 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount |  | $ 899 |  |  |  |  |  |  |  |  |  |  | $ 650 |  |  |  |  |
Series US-11 Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 5.45% |  |  |  |  |  |  |  |  |  |  | 5.45% |  |  |  |  |
Series US-1 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount |  | $ 491 |  |  |  |  |  |  |  |  |  |  | $ 353 |  |  |  |  |
Borrowings |  | $ 1,601 |  |  |  |  |  |  |  |  |  |  | $ 1,150 |  |  |  |  |
Series US-1 Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 4.464% |  |  |  |  |  |  |  |  |  |  | 4.464% |  |  |  |  |
Series US-2 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount |  | $ 136 |  |  |  |  |  |  |  |  |  |  | $ 98 |  |  |  |  |
Borrowings |  | $ 593 |  |  |  |  |  |  |  |  |  |  | $ 426 |  |  |  |  |
Series US-2 Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 4.30% |  |  |  |  |  |  |  |  |  |  | 4.30% |  |  |  |  |
Series US-4 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount |  | $ 152 |  |  |  |  |  |  |  |  |  |  | $ 109 |  |  |  |  |
Borrowings |  | $ 587 |  |  |  |  |  |  |  |  |  |  | $ 421 |  |  |  |  |
Series US-4 Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 3.65% |  |  |  |  |  |  |  |  |  |  | 3.65% |  |  |  |  |
Series US-5 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount |  | $ 127 |  |  |  |  |  |  |  |  |  |  | $ 91 |  |  |  |  |
Borrowings |  | $ 581 |  |  |  |  |  |  |  |  |  |  | $ 417 |  |  |  |  |
Series US-5 Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 2.15% |  |  |  |  |  |  |  |  |  |  | 2.15% |  |  |  |  |
Series US-6 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount |  | $ 117 |  |  |  |  |  |  |  |  |  |  | $ 84 |  |  |  |  |
Borrowings |  | $ 639 |  |  |  |  |  |  |  |  |  |  | $ 459 |  |  |  |  |
Series US-6 Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 3.20% |  |  |  |  |  |  |  |  |  |  | 3.20% |  |  |  |  |
Series US-7 Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount |  | $ 199 |  |  |  |  |  |  |  |  |  |  | $ 143 |  |  |  |  |
Borrowings |  | $ 742 |  |  |  |  |  |  |  |  |  |  | $ 533 |  |  |  |  |
Series US-7 Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 3.65% |  |  |  |  |  |  |  |  |  |  | 3.65% |  |  |  |  |
Series M-3 Medium-term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount |  | $ 60 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  | $ 200 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series M-3 Medium-term Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 6.55% |  |  |  |  |  |  |  |  |  |  | 6.55% |  |  |  |  |
Series M-39 Medium-term notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount |  | $ 301 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  | $ 395 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series M-39 Medium-term notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 4.35% |  |  |  |  |  |  |  |  |  |  | 4.35% |  |  |  |  |
M-45 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount |  | $ 367 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  | $ 400 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
M-45 MTN debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 4.45% |  |  |  |  |  |  |  |  |  |  | 4.45% |  |  |  |  |
Series M-52 Medium-term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount |  | $ 345 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  | $ 1,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series M-52 Medium-term Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 2.50% |  |  |  |  |  |  |  |  |  |  | 2.50% |  |  |  |  |
Series M-60 Medium-term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, repurchase amount |  | $ 380 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  | $ 600 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Series M-60 Medium-term Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  | 5.15% |  |  |  |  |  |  |  |  |  |  | 5.15% |  |  |  |  |
Series M-69 Medium-term Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 900 |  |  |  |
Series M-69 Medium-term Notes | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.70% |  |  |  |
M-70 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 700 |  |  |  |
M-70 MTN debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.30% |  |  |  |
M-68 MTN debentures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 750 |  |
M-68 MTN debentures | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4.40% |  |
Fixed-to-Fixed Rate Junior Subordinated Notes, Series D |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | $ 750 |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate, reset term |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, terms |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Fixed-to-Fixed Rate Junior Subordinated Notes, Series D | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  | 5.375% |  |  |  |  |  |  |  |  |  |  |  |
Fixed-to-Fixed Rate Junior Subordinated Notes, Series D | Government of Canada yield plus a spread |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  | 2.388% |  |  |  |  |  |  |  |  |  |  |  |
Fixed-to-Fixed Rate Junior Subordinated Notes, Series E |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings |  |  |  |  |  | $ 750 |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate, reset term |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, terms |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, redemption price, percentage |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  |  |
Fixed-to-Fixed Rate Junior Subordinated Notes, Series E | Fixed interest rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, interest rate |  |  |  |  |  | 5.875% |  |  |  |  |  |  |  |  |  |  |  |
Fixed-to-Fixed Rate Junior Subordinated Notes, Series E | Government of Canada yield plus a spread |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Borrowings, adjustment to interest rate basis |  |  |  |  |  | 2.44% |  |  |  |  |  |  |  |  |  |  |  |
Unsecured Committed Term Loan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from borrowings |  |  |  | $ 152 | $ 110 |  | $ 139 | $ 102 |  |  |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  |  |  | $ 972 |  |  |  |  |  |  |  |  |  |  | $ 700 |  | $ 972 | $ 700
[1] | We have presented amounts from the previous period to make them consistent with the presentation for the current period.

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- Definition Borrowings, interest rate, reset term + References No definition available. + Details
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- Definition Borrowings, interest rate, term + References No definition available. + Details
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Namespace Prefix: | bce_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Borrowings, Principal Amount, Repurchased + References No definition available. + Details
Name: | bce_BorrowingsPrincipalAmountRepurchased
Namespace Prefix: | bce_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Borrowings, Redemption Price, Percentage + References No definition available. + Details
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Balance Type: | na
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- Definition Early repayments of non-current borrowings + References No definition available. + Details
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- Definition Gain (Loss) on Debt Redemption + References No definition available. + Details
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Namespace Prefix: | bce_
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Balance Type: | credit
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- Definition Line Of Credit Facility, Maximum Borrowing Capacity1 + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Repayments of lease liabilities + References No definition available. + Details
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Namespace Prefix: | bce_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition The amount of outstanding funds that the entity is obligated to repay. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Note Expiry date 2027-01-01 -Name IAS -Number 1 -IssueDate 2025-01-01 -Paragraph 55 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2025-en-b&anchor=para_55&doctype=Standard -URIDate 2025-03-27 + Details
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Namespace Prefix: | ifrs-full_
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Balance Type: | credit
Period Type: | instant

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- Definition The adjustment to the basis (reference rate) used for calculation of the interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_7&doctype=Standard -URIDate 2025-03-27 + Details
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- Definition The interest rate on borrowings. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IFRS -Number 7 -IssueDate 2025-01-01 -Paragraph 7 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2025-en-r&anchor=para_7&doctype=Standard -URIDate 2025-03-27 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:percentItemType
Balance Type: | na
Period Type: | instant

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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
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- Definition The cash inflow from borrowings obtained. [Refer: Borrowings] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2025-01-01 -Paragraph 17 -Subparagraph c -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2025-en-r&anchor=para_17_c&doctype=Standard -URIDate 2025-03-27 + Details
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