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Financial instruments (Details) - CAD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 12, 2024
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Schedule of Investments [Line Items]            
Debt and finance lease liabilities, carrying value   $ 21,890   $ 21,890   $ 21,437
Debt and finance lease liabilities, fair value   20,314   20,314   20,550
Payments for settlement of foreign currency forward contracts   0 $ 0 65 $ 0  
Foreign Exchange Contract            
Schedule of Investments [Line Items]            
Loss on derivative       4    
Foreign currency contracts, fair value           $ 60
Payments for settlement of foreign currency forward contracts $ 65          
Net Investment Hedge            
Schedule of Investments [Line Items]            
Unrealized loss on net investment hedge   $ 41 $ 163 $ 144 $ 162