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Debt due within one year - Summary of Total Bank Credit Facilities (Details)
$ in Millions
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Disclosure of detailed information about borrowings [line items]      
DRAWN   $ 975,000,000 $ 837,000,000
Unsecured revolving credit facility and expansion facility      
Disclosure of detailed information about borrowings [line items]      
TOTAL AVAILABLE   3,500,000,000  
DRAWN   0  
LETTERS OF CREDIT   0  
COMMERCIAL PAPER OUTSTANDING $ 274 349,000,000  
NET AVAILABLE   3,151,000,000  
Other      
Disclosure of detailed information about borrowings [line items]      
TOTAL AVAILABLE   106,000,000  
DRAWN   0  
LETTERS OF CREDIT   106,000,000  
COMMERCIAL PAPER OUTSTANDING   0  
NET AVAILABLE   0  
Total committed credit facilities      
Disclosure of detailed information about borrowings [line items]      
TOTAL AVAILABLE   3,606,000,000  
DRAWN   0  
LETTERS OF CREDIT   106,000,000  
COMMERCIAL PAPER OUTSTANDING   349,000,000  
NET AVAILABLE   3,151,000,000  
Total non-committed credit facilities      
Disclosure of detailed information about borrowings [line items]      
TOTAL AVAILABLE   1,939,000,000  
DRAWN   0  
LETTERS OF CREDIT   1,082,000,000  
COMMERCIAL PAPER OUTSTANDING   0  
NET AVAILABLE   857,000,000  
Total committed and non-committed credit facilities      
Disclosure of detailed information about borrowings [line items]      
TOTAL AVAILABLE   5,545,000,000  
DRAWN   0  
LETTERS OF CREDIT   1,188,000,000  
COMMERCIAL PAPER OUTSTANDING   349,000,000  
NET AVAILABLE   4,008,000,000  
Unsecured revolving credit facility      
Disclosure of detailed information about borrowings [line items]      
TOTAL AVAILABLE   2,500,000,000  
Unsecured expansion facility      
Disclosure of detailed information about borrowings [line items]      
TOTAL AVAILABLE   $ 1,000,000,000