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Share capital - Summary of Outstanding Common Shares (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
NUMBER OF SHARES    
Shares issued under employee stock option plan (in shares) 306,139 2,952,992
Unclaimed shares (in shares) (11,408) (23,624)
Shares issued under employee stock option plan $ 18 $ 171
Common shares    
NUMBER OF SHARES    
Stated capital beginning of period 20,840  
Stated capital end of period $ 20,859 $ 20,840
Issued capital | Common shares    
NUMBER OF SHARES    
Number of shares beginning of period (in shares) 911,982,866 909,018,871
Shares issued for deferred plan (in shares) 843 11,003
Shares issued under employee stock option plan (in shares) 306,139 2,952,992
Unclaimed shares (in shares) (15,303) 0
Number of shares end of period (in shares) 912,274,545 911,982,866
Stated capital beginning of period $ 20,840 $ 20,662
Shares issued under deferred share plan 0 1
Shares issued under employee stock option plan 19 177
Unclaimed shares 0 0
Stated capital end of period $ 20,859 $ 20,840