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Share capital - Summary of Outstanding Common Shares (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021
NUMBER OF SHARES |  |
Shares issued under employee stock option plan (in shares) | 2,952,992 | 4,603,861
Shares issued under employee stock option plan | $ 171 | $ 262
Common shares |  |
NUMBER OF SHARES |  |
Stated capital beginning of period | 20,662 |
Stated capital end of period | $ 20,840 | $ 20,662
Issued capital | Common shares |  |
NUMBER OF SHARES |  |
Number of shares beginning of period (in shares) | 909,018,871 | 904,415,010
Stated capital beginning of period | $ 20,662 | $ 20,390
Shares issued for deferred plan (in shares) | 11,003 | 0
Shares issued under deferred share plan | $ 1 | $ 0
Shares issued under employee stock option plan (in shares) | 2,952,992 | 4,603,861
Shares issued under employee stock option plan | $ 177 | $ 272
Number of shares end of period (in shares) | 911,982,866 | 909,018,871
Stated capital end of period | $ 20,840 | $ 20,662

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