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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

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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 2023-01-01 -Paragraph 78 -Subparagraph e -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_78_e&doctype=Standard -URIDate 2023-03-23 + Details
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