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Share capital - Summary of Outstanding Common Shares (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 CAD ($) shares | Dec. 31, 2019 CAD ($) shares
NUMBER OF SHARES |  |
Shares issued under employee stock option plan (in shares) | shares | 506,828 | 4,459,559
Shares issued under employee stock option plan | $ 26 | $ 240
Shares issued under ESP |  | 75
Common shares |  |
NUMBER OF SHARES |  |
Stated capital beginning of period | 20,363 |
Stated capital end of period | $ 20,390 | $ 20,363
Issued capital | Common shares |  |
NUMBER OF SHARES |  |
Number of shares beginning of period (in shares) | shares | 903,908,182 | 898,200,415
Stated capital beginning of period | $ 20,363 | $ 20,036
Shares issued under employee stock option plan (in shares) | shares | 506,828 | 4,459,559
Shares issued under employee stock option plan | $ 27 | $ 251
Shares issued under ESP (in shares) | shares | 0 | 1,231,479
Shares issued under ESP | $ 0 | $ 75
Number Of Shares Issued Through Deferred Share Plan | shares | 0 | 16,729
Increase (Decrease) Through Issuance Of Shares Under Deferred Shares Plan, Equity | $ 0 | $ 1
Number of shares end of period (in shares) | shares |  | 903,908,182
Stated capital end of period | $ 20,390 | $ 20,363

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- Definition The increase (decrease) in equity resulting from the exercise of options. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2020-01-01 -Paragraph 106 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2020-en-r&anchor=para_106_d&doctype=Standard -URIDate 2020-01-01 + Details
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