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Share capital - Summary of Outstanding Common Shares (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 CAD ($) shares | Dec. 31, 2020 CAD ($) shares
NUMBER OF SHARES |  |
Shares issued under employee stock option plan (in shares) | shares | 4,603,861 | 506,828
Shares issued under employee stock option plan | $ 262 | $ 26
Common shares |  |
NUMBER OF SHARES |  |
Stated capital beginning of period | 20,390 |
Stated capital end of period | $ 20,662 | $ 20,390
Issued capital | Common shares |  |
NUMBER OF SHARES |  |
Number of shares beginning of period (in shares) | shares | 904,415,010 | 903,908,182
Stated capital beginning of period | $ 20,390 | $ 20,363
Shares issued under employee stock option plan (in shares) | shares | 4,603,861 | 506,828
Shares issued under employee stock option plan | $ 272 | $ 27
Number of shares end of period (in shares) | shares | 909,018,871 | 904,415,010
Stated capital end of period | $ 20,662 | $ 20,390

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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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