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Debt due within one year - Summary of Total Bank Credit Facilities (Details)
$ in Millions
Dec. 31, 2022
USD ($)
Dec. 31, 2022
CAD ($)
Dec. 31, 2021
CAD ($)
Disclosure of detailed information about borrowings [line items]      
DRAWN   $ 1,680,000,000 $ 990,000,000
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 $ 627 849,000,000  
NET AVAILABLE   2,651,000,000  
Unsecured non-revolving credit facility      
Disclosure of detailed information about borrowings [line items]      
TOTAL AVAILABLE   647,000,000  
DRAWN   0  
LETTERS OF CREDIT   0  
COMMERCIAL PAPER OUTSTANDING   0  
NET AVAILABLE   647,000,000  
Borrowing facilities, maximum borrowing capacity   647,000,000  
Other      
Disclosure of detailed information about borrowings [line items]      
TOTAL AVAILABLE   106,000,000  
DRAWN   0  
LETTERS OF CREDIT   96,000,000  
COMMERCIAL PAPER OUTSTANDING   0  
NET AVAILABLE   10,000,000  
Total committed credit facilities      
Disclosure of detailed information about borrowings [line items]      
TOTAL AVAILABLE   4,253,000,000  
DRAWN   0  
LETTERS OF CREDIT   96,000,000  
COMMERCIAL PAPER OUTSTANDING   849,000,000  
NET AVAILABLE   3,308,000,000  
Total non-committed credit facilities      
Disclosure of detailed information about borrowings [line items]      
TOTAL AVAILABLE   1,939,000,000  
DRAWN   0  
LETTERS OF CREDIT   808,000,000  
COMMERCIAL PAPER OUTSTANDING   0  
NET AVAILABLE   1,131,000,000  
Total committed and non-committed credit facilities      
Disclosure of detailed information about borrowings [line items]      
TOTAL AVAILABLE   6,192,000,000  
DRAWN   0  
LETTERS OF CREDIT   904,000,000  
COMMERCIAL PAPER OUTSTANDING   849,000,000  
NET AVAILABLE   4,439,000,000  
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