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Debt due within one year - Schedule of Debt Due Within One Year (Details)
$ in Millions, $ in Millions
Dec. 31, 2023
CAD ($)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
USD ($)
Disclosure of detailed information about borrowings [line items]        
Current portion of non-current borrowings $ 3,247   $ 1,680  
Total debt due within one year $ 5,042   4,137  
Notes payable | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2023 5.21% 5.21%    
Loans        
Disclosure of detailed information about borrowings [line items]        
Current borrowings $ 1,588 $ 1,200 1,588 $ 1,173
Loans | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2023 6.16% 6.16%    
Long-term debt due within one year | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2023 3.60% 3.60%    
Trade receivables | Notes payable        
Disclosure of detailed information about borrowings [line items]        
Current borrowings $ 207   869  
Trade receivables | Loans        
Disclosure of detailed information about borrowings [line items]        
Current borrowings 1,588   1,588  
Trade receivables | Long-term debt due within one year        
Disclosure of detailed information about borrowings [line items]        
Current portion of non-current borrowings 3,247   1,680  
Trade receivables | Commercial paper        
Disclosure of detailed information about borrowings [line items]        
Current borrowings 197 $ 149 849 $ 627
Trade receivables | Finance leases        
Disclosure of detailed information about borrowings [line items]        
Current portion of non-current borrowings $ 1,074   $ 930