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Long-term debt (Narrative) (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2017
Disclosure of detailed information about borrowings [line items]    
Accordion feature $ 200  
Revolving credit facility [Member]    
Disclosure of detailed information about borrowings [line items]    
Revolving credit facility, available balance 550  
Accordion feature $ 200  
Borrowings, interest rate 7.10%  
Convertible debenture (2017) [Member]    
Disclosure of detailed information about borrowings [line items]    
Convertible debenture   $ 300
Borrowings, interest rate   4.00%
Conversion price   $ 22.89
Convertible debenture (2017) [Member] | Public offering [Member]    
Disclosure of detailed information about borrowings [line items]    
Convertible debenture   $ 184
Convertible debenture (2017) [Member] | Private placements offering [Member]    
Disclosure of detailed information about borrowings [line items]    
Convertible debenture   $ 116