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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