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Share capital - Summary of Outstanding Common Shares (Details) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Number of shares    
Shares issued under employee stock option plan (in shares) 0 306,139
Unclaimed shares (in shares) (938,742) (11,408)
Shares issued under employee stock option plan   $ 18
Common shares    
Number of shares    
Stated capital beginning of period $ 20,859  
Stated capital end of period $ 20,860 $ 20,859
Issued capital | Common shares    
Number of shares    
Number of shares beginning of period (in shares) 912,274,545 911,982,866
Shares issued for deferred plan (in shares) 8,558 843
Shares issued under employee stock option plan (in shares) 0 306,139
Unclaimed shares (in shares) 0 (15,303)
Number of shares end of period (in shares) 912,283,103 912,274,545
Stated capital beginning of period $ 20,859 $ 20,840
Shares issued under deferred share plan 1 0
Shares issued under employee stock option plan 0 19
Unclaimed shares 0 0
Stated capital end of period $ 20,860 $ 20,859