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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, 2021 | Dec. 31, 2020 | May 25, 2021 | May 26, 2020 | Dec. 31, 2019
Disclosure of classes of share capital [line items] |  |  |  |  |
Deficit | $ (2,453) | $ (1,826) |  |  |
Percentage of public float of common shares making up stock purchase agreement, shares authorized |  |  | 7.16% | 7.02% |
Number of shares issued and fully paid that were not cancelled due to timing differences between the transaction date and settlement date | 0 | 456,200 |  |  |
NCIB Program |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Number of shares issued and fully paid | 0 | 7,352,600 |  |  |
Par value per share | $ 0 | $ 8.33 |  |  |
Issued capital | $ 0 | $ 61 |  |  |
Weighted average book value of shares cancelled | 0 | 79 |  |  |
Deficit | 0 | 18 |  |  |
Stock purchase agreement, number of shares authorized |  |  | 14,000,000 | 14,000,000 |
Common shares |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Issued capital | $ 2,901 | $ 2,896 |  |  | $ 2,978

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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 2021-01-01 -Paragraph 78 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_78_e&doctype=Standard -URIDate 2021-03-24 + Details
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