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Financial assets and liabilities - Equity Price Exposures (Details) - CAD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Dec. 31, 2025
Disclosure of detailed information about hedging instruments [line items]
Net gains (losses) on change in fair value of derivatives	$ (62)	$ (43)	$ (29)	$ (42)
Equity price risk
Disclosure of detailed information about hedging instruments [line items]
Net gains (losses) on change in fair value of derivatives	$ (62)	$ (43)	$ (29)	$ (42)
Percentage of possible change in risk variable	5.00%		5.00%
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar impact in net earnings	$ 15		$ 15
Forward contract | Equity price risk
Disclosure of detailed information about hedging instruments [line items]
Hedging instrument, liabilities	$ 219		$ 219		$ 187

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Sensitivity Analysis For Types Of Market Risk, Reasonably Possible Change In Risk Variable, Impact On Net Earnings From Continuing Operations

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The gains (losses) resulting from change in the fair value of derivatives recognised in profit or loss. [Refer: Derivatives [member]]

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of a hedging instrument, recognised as a liability. [Refer: Hedging instruments [domain]]

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