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Financial and derivative instruments - Summary of estimated fair value of financial instruments (Detail) - CAD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Assets    
Derivative Asset $ 44 $ 59
Liabilities    
Derivative liabilities 31 82
Effect of counterparty netting    
Assets    
Derivative Asset (12) (38)
Liabilities    
Derivative liabilities (12) (38)
Effect of collateral netting    
Assets    
Derivative Asset (2) 0
Liabilities    
Derivative liabilities 0 (14)
Net carrying value    
Assets    
Derivative Asset 30 21
Liabilities    
Derivative liabilities 19 30
Level 1    
Assets    
Derivative Asset 14 38
Liabilities    
Derivative liabilities 12 52
Level 2    
Assets    
Derivative Asset 30 21
Liabilities    
Derivative liabilities 19 30
Level 3    
Assets    
Derivative Asset 0 0
Liabilities    
Derivative liabilities $ 0 $ 0