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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