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Long-term debt - Summary of Long-Term Debt (Details)
$ in Millions, $ in Millions
Dec. 31, 2021
CAD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Disclosure of detailed information about borrowings [line items]        
Total long-term debt due within one year $ (990)   $ (975)  
Total long-term debt $ 27,048   23,906  
1997 trust indenture | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2021 3.67% 3.67%    
1976 trust indenture | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2021 9.38% 9.38%    
2011 trust indenture | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2021 4.00% 4.00%    
2016 U.S. trust indenture        
Disclosure of detailed information about borrowings [line items]        
Notional amount   $ 4,100   $ 1,750
2016 U.S. trust indenture | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2021 3.26% 3.26%    
1996 trust indenture (subordinated) | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2021 8.21% 8.21%    
Lease liabilities | Weighted Average        
Disclosure of detailed information about borrowings [line items]        
WEIGHTED AVERAGE INTEREST RATE AT DECEMBER 31, 2021 4.13% 4.13%    
Gross carrying amount        
Disclosure of detailed information about borrowings [line items]        
Total debt $ 28,160   24,970  
Gross carrying amount | 1997 trust indenture        
Disclosure of detailed information about borrowings [line items]        
Total debt 16,750   16,400  
Gross carrying amount | 1976 trust indenture        
Disclosure of detailed information about borrowings [line items]        
Total debt 975   1,100  
Gross carrying amount | 2011 trust indenture        
Disclosure of detailed information about borrowings [line items]        
Total debt 225   225  
Gross carrying amount | 2016 U.S. trust indenture        
Disclosure of detailed information about borrowings [line items]        
Total debt 5,188   2,228  
Gross carrying amount | 1996 trust indenture (subordinated)        
Disclosure of detailed information about borrowings [line items]        
Total debt 275   275  
Gross carrying amount | Lease liabilities        
Disclosure of detailed information about borrowings [line items]        
Total debt 4,309   4,356  
Gross carrying amount | Other        
Disclosure of detailed information about borrowings [line items]        
Total debt 438   386  
Net unamortized discount        
Disclosure of detailed information about borrowings [line items]        
Total debt 26   19  
Unamortized debt issuance costs        
Disclosure of detailed information about borrowings [line items]        
Total debt $ 96   $ 70