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Financial assets and liabilities - Interest Rate Exposures (Details)
$ in Millions
Jun. 30, 2026
CAD ($)
Interest rate risk  
Disclosure of detailed information about hedging instruments [line items]  
Percentage of possible change in risk variable 1.00%
Interest rate risk | Top of range  
Disclosure of detailed information about hedging instruments [line items]  
Reasonably possible change in risk variable, gain (loss) on net earnings $ (24)
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar gain (loss) on other comprehensive income (loss) 87
Interest rate risk | Bottom of range  
Disclosure of detailed information about hedging instruments [line items]  
Reasonably possible change in risk variable, gain (loss) on net earnings 12
Reasonably possible change in 10% depreciation (appreciation) of the CAD dollar gain (loss) on other comprehensive income (loss) (83)
Interest rate swap  
Disclosure of detailed information about hedging instruments [line items]  
Hedging instrument, liabilities 1
Interest rate swap | Interest rate risk  
Disclosure of detailed information about hedging instruments [line items]  
Hedging instrument, liabilities 8
M-45 MTN debentures | Interest rate swap | Interest rate risk  
Disclosure of detailed information about hedging instruments [line items]  
Notional amount, financial instrument terminated 200
Initial net financial liabilities, at fair value 3
EO Notes | Interest rate swap | Interest rate risk  
Disclosure of detailed information about hedging instruments [line items]  
Initial net financial liabilities, at fair value $ 5