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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