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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)

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- Definition The nominal value of capital issued. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2024-01-01 -Paragraph 78 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_78_e&doctype=Standard -URIDate 2024-03-27 + Details
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