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Financial instruments (Details) - CAD ($)
$ in Millions
3 Months Ended
Jan. 12, 2024
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Schedule of Investments [Line Items]        
Debt and finance lease liabilities, carrying value   $ 21,848   $ 21,437
Debt and finance lease liabilities, fair value   20,449   20,550
Payments for settlement of foreign currency forward contracts   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 gain (loss) on net investment hedge   $ (103) $ (1)