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Debt due within one year - Schedule of Debt Due Within One Year (Details)
$ in Millions, $ in Millions
Dec. 31, 2022
CAD ($)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Disclosure of detailed information about borrowings [line items]        
Current portion of non-current borrowings $ 1,680   $ 990  
Total debt due within one year $ 4,137   2,625  
Notes payable | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2022 4.27% 4.27%    
Loans        
Disclosure of detailed information about borrowings [line items]        
Current borrowings $ 1,588 $ 1,173 900  
Loans | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2022 5.19% 5.19%    
Long-term debt due within one year | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2022 4.79% 4.79%    
Trade receivables | Notes payable        
Disclosure of detailed information about borrowings [line items]        
Current borrowings $ 869   735  
Trade receivables | Loans        
Disclosure of detailed information about borrowings [line items]        
Current borrowings 1,588   900  
Trade receivables | Long-term debt due within one year        
Disclosure of detailed information about borrowings [line items]        
Current portion of non-current borrowings 1,680   990  
Trade receivables | Commercial paper        
Disclosure of detailed information about borrowings [line items]        
Current borrowings 849 $ 627 711 $ 561
Trade receivables | Finance leases        
Disclosure of detailed information about borrowings [line items]        
Current portion of non-current borrowings $ 930   $ 864