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Significant accounting policies - Revenue from Contracts with Customers (Details)
 12 Months Ended
Dec. 31, 2021
Residential customers | Bell Wireless  
Disclosure of performance obligations [line items]  
Description of significant payment terms in contracts with customers For wireless products and services sold in bundled arrangements, including device financing plans, customers pay monthly over a contract term of up to 24 months for residential customers and up to 36 months for business customers. If they include a significant financing component, device financing plan receivables are discounted at market rates and interest revenue is accreted over the contractual repayment period.
Business customers | Bell Wireless  
Disclosure of performance obligations [line items]  
Description of significant payment terms in contracts with customers For wireless products and services sold in bundled arrangements, including device financing plans, customers pay monthly over a contract term of up to 24 months for residential customers and up to 36 months for business customers. If they include a significant financing component, device financing plan receivables are discounted at market rates and interest revenue is accreted over the contractual repayment period.
Business customers | Wireline  
Disclosure of performance obligations [line items]  
Description of significant payment terms in contracts with customers For wireline customers, products are usually paid in full at the point of sale. Services are paid for on a monthly basis except where a billing schedule has been established with certain business customers under long-term contracts that can generally extend up to seven years.