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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, 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

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