XML 198 R163.htm IDEA: XBRL DOCUMENT v3.22.4
Common Shares - The effects of the Corporation's purchase and cancellation of the common shares (Details) - CAD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
May 24, 2022
May 25, 2021
Disclosure of classes of share capital [line items]        
Amount recorded in deficit $ (2,514) $ (2,453)    
Percentage of public float of common shares     7.16% 7.16%
Shares repurchased but not cancelled 164,300 0    
Payments for shares repurchased but not cancelled $ 52      
NCIB Program        
Disclosure of classes of share capital [line items]        
Total shares purchased 4,342,300 0    
Average purchase price per share $ 12.48 $ 0    
Total cost (millions) $ 54 $ 0    
Weighted average book value of shares cancelled 46 0    
Amount recorded in deficit $ (8) $ 0    
Repurchase of maximum common shares (in shares)     14,000,000 14,000,000