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Contract costs (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Opening balance | $ 1,412 | $ 1,143
Incremental costs of obtaining a contract and contract fulfillment costs | 969 | 892
Amortization included in operating costs | (791) | (623)
Ending balance | $ 1,590 | $ 1,412
Bottom of range |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Contract costs, amortization period | 12 months |
Top of range |  |
Disclosure of disaggregation of revenue from contracts with customers [line items] |  |
Contract costs, amortization period | 84 months |

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- Definition Incremental Costs Incurred To Obtain Or Fulfill Contracts With Customers + References No definition available. + Details
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- Definition Incremental Costs Incurred To Obtain Or Fulfill Contracts With Customers, Amortization Period + References No definition available. + Details
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- Definition The amount of amortisation for assets recognised from the costs incurred to obtain or fulfil contracts with customers. [Refer: Assets recognised from costs to obtain or fulfil contracts with customers; Amortisation expense] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 128 -Subparagraph b -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_128_b&doctype=Standard -URIDate 2024-03-27 + Details
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- Definition The amount of assets recognised from the costs to obtain or fulfil contracts with customers. The costs to obtain a contract with a customer are the incremental costs of obtaining the contract that the entity would not have incurred if the contract had not been obtained. The costs to fulfil a contract with a customer are the costs that relate directly to a contract or to an anticipated contract that the entity can specifically identify. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2024-01-01 -Paragraph 128 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2024-en-r&anchor=para_128_a&doctype=Standard -URIDate 2024-03-27 + Details
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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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