Material accounting policies - Revenue from Contracts with Customers (Details) |
12 Months Ended |
|---|---|
Dec. 31, 2025 | |
| Bell Wireless | |
| Disclosure of performance obligations [line items] | |
| Contract with customer, significant payment terms, duration | 24 months |
| Contract with customer, significant payment terms, additional financing period | 12 months |
| Business customers | Bell Wireline | Top of range | |
| Disclosure of performance obligations [line items] | |
| Contract with customer, significant payment terms, duration | 10 years |