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Contract costs (Details) - CAD ($) $ in Millions	12 Months Ended
	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.

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- Definition

Incremental Costs Incurred To Obtain Or Fulfill Contracts With Customers, Amortization Period

+ References

No definition available.

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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
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-Number 15
-IssueDate 2024-01-01
-Paragraph 128
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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

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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.

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