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Share capital - Schedule of Common Shares Issued (Detail)
$ in Millions
 3 Months Ended 9 Months Ended
Jul. 31, 2025
CAD ($)
Shares
shares
Jul. 31, 2024
CAD ($)
Shares
shares
Jul. 31, 2025
CAD ($)
Shares
shares
Jul. 31, 2024
CAD ($)
Shares
shares
Disclosure of classes of share capital [line items]        
Balance at beginning of period     $ 59,007  
Balance at end of period $ 62,876 $ 57,783 $ 62,876 $ 57,783
Common shares [member]        
Disclosure of classes of share capital [line items]        
Beginning balance, Number of shares | shares 934,230,189 943,002,419 942,294,598 931,098,941
Balance at beginning of period $ 16,929 $ 16,813 $ 17,011 $ 16,082
Equity-settled share-based compensation plans, Number of shares | Shares 786,626 204,180 2,191,152 897,057
Shareholder investment plan, Number of shares | shares   651,277 629 10,462,890
Employee share purchase plan, Number of shares | shares   688,578   2,146,385
Number of shares issued, Number of shares | shares 935,016,815 944,546,454 944,486,379 944,605,273
Purchase of common shares for cancellation, Number of shares | shares (5,500,000)   (15,000,000)  
Treasury shares, Number of shares | shares (66,124) 43,463 (35,688) (15,356)
Equity-settled share-based compensation plans $ 46 $ 12 $ 132 $ 49
Shareholder investment plan, Amount   45   652
Employee share purchase plan, Amount   46   136
Number of shares issued, Amount 16,975 16,916 17,143 16,919
Purchase of common shares for cancellation, Amount (100)   (272)  
Treasury shares, Amount (8) 3 (4)  
Balance at end of period $ 16,867 $ 16,919 $ 16,867 $ 16,919
Ending balance, Number of shares | shares 929,450,691 944,589,917 929,450,691 944,589,917