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Debt due within one year - Narrative (Details) $ in Millions, $ in Millions | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 28, 2025 CAD ($) | Feb. 28, 2025 USD ($) | Dec. 31, 2023 USD ($) | Feb. 18, 2025 CAD ($) | Feb. 18, 2025 USD ($) | Dec. 31, 2024 CAD ($) | Nov. 22, 2024 CAD ($) | Nov. 01, 2024 CAD ($) | Nov. 01, 2024 USD ($)
Canadian and U.S. Commercial Paper, Canadian and U.S. Currency |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 3,000 |  |  |
Canadian and U.S. Commercial Paper, Canadian Currency |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | 3,500 |  |  |
Unsecured revolving and expansion credit facilities |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | 4,000 |  |  |
Line of credit facility, increase in borrowing capacity |  |  |  |  |  |  | $ 500 |  |
U.S. Dollar Term Loan Facility | Bell Canada |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, trade loan agreement |  |  |  |  |  |  |  | $ 5,324 | $ 3,700
U.S. Dollar Term Loan Facility | Bell Canada | Major business combination |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Borrowings, trade loan agreement |  |  |  | $ 3,949 | $ 2,735 |  |  |  |
Increase (decrease) in borrowings, trade loan agreement | $ (1,375) | $ (965) |  |  |  |  |  |  |
Total non-committed credit facilities |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | 2,673 |  |  |
Total non-committed credit facilities | Bell Canada |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | 1,810 |  |  |
Total non-committed credit facilities | Bell Mobility Inc. |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  | $ 863 |  |  |
Borrowings, uncommitted trade loan agreement |  |  | $ 600 |  |  |  |  |  |
Borrowings maturity, term |  |  | 24 months |  |  |  |  |  |

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