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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, 2024
Dec. 31, 2023
Disclosure of classes of share capital [line items]    
Amount recorded in deficit $ (2,458) $ (2,567)
NCIB Program    
Disclosure of classes of share capital [line items]    
Total shares purchased (in shares) 13,467,400 7,537,500
Average purchase price per share $ 10.59 $ 11.49
Total cost (millions) $ 143 $ 87
Book value of shares cancelled 146 80
Amount recorded in deficit $ 3 $ (7)