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Significant accounting policies - Revenue from Contracts with Customers (Details) | 12 Months Ended
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Dec. 31, 2018
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, customers pay monthly over a contract term of up to 24 months for residential customers and up to 36 months for business customers.
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, customers pay monthly over a contract term of up to 24 months for residential customers and up to 36 months for business customers.
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 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.

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- Definition The description of the significant payment terms in contracts with customers. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 119 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_119_b&doctype=Standard -URIDate 2018-03-16 + Details
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- Definition Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table. + References No definition available. + Details
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