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financial instruments - Credit risk (Details) - CAD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Credit risk    
Maximum exposure (excluding income tax effects) to credit risk $ 5,853 $ 6,061
Cash and temporary investments, net    
Credit risk    
Maximum exposure (excluding income tax effects) to credit risk 927 864
Accounts receivable    
Credit risk    
Maximum exposure (excluding income tax effects) to credit risk 4,069 4,234
Contract assets    
Credit risk    
Maximum exposure (excluding income tax effects) to credit risk 701 748
Derivative assets    
Credit risk    
Maximum exposure (excluding income tax effects) to credit risk $ 156 $ 215