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Long-term debt - Summary of Long-Term Debt (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]        
Total long-term debt due within one year $ (1,680)   $ (990)  
Total long-term debt $ 27,783   27,048  
1997 trust indenture | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2022 3.82% 3.82%    
1976 trust indenture | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2022 9.38% 9.38%    
2011 trust indenture | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2022 4.00% 4.00%    
2016 U.S. trust indenture        
Disclosure of detailed information about borrowings [line items]        
Notional amount   $ 4,850   $ 4,100
2016 U.S. trust indenture | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2022 3.32% 3.32%    
1996 trust indenture (subordinated) | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2022 8.21% 8.21%    
Lease liabilities | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2022 4.53% 4.53%    
Trade receivables        
Disclosure of detailed information about borrowings [line items]        
Total debt $ 29,598   28,160  
Trade receivables | 1997 trust indenture        
Disclosure of detailed information about borrowings [line items]        
Total debt 16,747   16,750  
Trade receivables | 1976 trust indenture        
Disclosure of detailed information about borrowings [line items]        
Total debt 975   975  
Trade receivables | 2011 trust indenture        
Disclosure of detailed information about borrowings [line items]        
Total debt 225   225  
Trade receivables | 2016 U.S. trust indenture        
Disclosure of detailed information about borrowings [line items]        
Total debt 6,525   5,188  
Notional amount       $ 600
Trade receivables | 1996 trust indenture (subordinated)        
Disclosure of detailed information about borrowings [line items]        
Total debt 275   275  
Trade receivables | Lease liabilities        
Disclosure of detailed information about borrowings [line items]        
Total debt 4,402   4,309  
Trade receivables | Other        
Disclosure of detailed information about borrowings [line items]        
Total debt 449   438  
Trade receivables | Series M-53 MTN debentures        
Disclosure of detailed information about borrowings [line items]        
Notional amount 500      
Net unamortized discount        
Disclosure of detailed information about borrowings [line items]        
Total debt 34   26  
Unamortized debt issuance costs        
Disclosure of detailed information about borrowings [line items]        
Total debt $ 101   $ 96