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Share Capital - Common Shares Issued and Outstanding (Details) $ / shares in Units, shares in Thousands, $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 CAD ($) shares $ / shares | Dec. 31, 2020 CAD ($) shares | Aug. 14, 2019 shares
Reconciliation of number of shares outstanding [abstract] |  |  |
Stock options exercised (in shares) | 900 | 631 |
Redemption of shares | $ | $ 0 | $ 200 |
Common shares |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |
Number of shares outstanding, beginning of year (in shares) | 585,100 | 587,800 |
Stock options exercised (in shares) | 900 | 800 |
Common shares purchased for cancellation (in shares) | 0 | (3,500) |
Number of shares outstanding, end of year (in shares) | 586,000 | 585,100 |
Balance, beginning of year | $ | $ 8,262 | $ 8,289 |
Stock options exercised | $ | 43 | 23 |
Common shares purchased for cancellation | $ | 0 | (50) |
Balance, end of year | $ | $ 8,305 | $ 8,262 |
Number of shares authorized for purchase and cancellation (in shares) |  |  | 15,000
2019 NCIB | Common shares |  |  |
Reconciliation of number of shares outstanding [abstract] |  |  |
Common shares purchased for cancellation (in shares) | (3,500) |  |
Purchase and cancellation of treasury shares (cad per share) | $ / shares | $ 56.86 |  |
Redemption of shares | $ | $ 200 |  |

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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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- Definition The number of share options exercised in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2021-01-01 -Paragraph 45 -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2021-en-r&anchor=para_45_b_iv&doctype=Standard -URIDate 2021-03-24 + Details
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- Definition The number of shares that have been authorised and issued, reduced by treasury shares held. [Refer: Treasury shares] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 79 -Subparagraph a -Clause iv -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_79_a_iv&doctype=Standard -URIDate 2021-03-24 + Details
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