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Severance, acquisition and other costs (Details) $ in Millions	12 Months Ended
	Dec. 31, 2024 CAD ($) position	Dec. 31, 2023 CAD ($)	Dec. 31, 2022 CAD ($)
Severance Costs [Line Items]
Severance		$ (134)	$ (83)
Acquisition and other		(66)	(11)
Total severance, acquisition and other costs		$ (200)	$ (94)
Announcing or commencing implementation of major restructuring | Forecast
Severance Costs [Line Items]
Severance	$ (400)
Workforce reduction, number of positions eliminated | position	4,800
Workforce reduction, percentage of positions eliminated	9.00%

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- Definition

Severance Costs [Line Items]

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- Definition

Termination Benefits Expense, Acquisition-Related Costs, And Other Costs

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Workforce Reduction, Number Of Positions Eliminated

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Workforce Reduction, Percentage Of Positions Eliminated

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- Definition

The amount of acquisition-related costs recognised as an expense for transactions that are recognised separately from the acquisition of assets and the assumption of liabilities in business combinations. [Refer: Business combinations [member]]

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of expense in relation to termination benefits. Termination benefits are employee benefits provided in exchange for the termination of an employee's employment as a result of either: (a) an entity's decision to terminate an employee's employment before the normal retirement date; or (b) an employee's decision to accept an offer of benefits in exchange for the termination of employment. [Refer: Employee benefits expense]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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