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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, 2023
Dec. 31, 2022
May 26, 2023
May 24, 2022
Disclosure of classes of share capital [line items]        
Amount recorded in deficit $ (2,567) $ (2,514)    
Percentage of public float of common shares     729.00% 716.00%
Shares repurchased but not cancelled 181,800 164,300    
Payments for shares repurchased but not cancelled $ 2 $ 2    
Percentage of public float of common shares     729.00% 716.00%
NCIB Program        
Disclosure of classes of share capital [line items]        
Total shares purchased 7,537,500 4,342,300    
Average purchase price per share $ 11.49 $ 12.48    
Total cost (millions) $ 87 $ 54    
Book value of shares cancelled 80 46    
Amount recorded in deficit $ (7) $ (8)    
Repurchase of maximum common shares (in shares)     14,000,000 14,000,000
Repurchase of maximum common shares (in shares)     14,000,000 14,000,000