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Common and preferred shares and other equity instruments - Schedule of Common Shares Issued (Detail) $ in Millions | 12 Months Ended
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Oct. 31, 2025 CAD ($) shares | Oct. 31, 2024 CAD ($) shares
Disclosure of classes of share capital [line items] |  |
Balance at beginning of year | $ 59,007 |
Balance at end of year | $ 64,413 | $ 59,007
Common shares [member] |  |
Disclosure of classes of share capital [line items] |  |
Beginning balance, Number of shares | shares | 942,294,598 | 931,098,941
Equity-settled share-based compensation plans | shares | 2,824,550 | 2,593,751
Shareholder investment plan, Number of shares | shares | 629 | 10,986,157
Employee share purchase plan, Number of shares | shares |  | 2,626,726
Number of shares issued, Number of shares | shares | 945,119,777 | 947,305,575
Purchase of common shares for cancellation, Number of shares | shares | (18,500,000) | (5,000,000)
Treasury shares, Number of shares | shares | (5,741) | (10,977)
Ending balance, Number of shares | shares | 926,614,036 | 942,294,598
Balance at beginning of year | $ 17,011 | $ 16,082
Equity-settled share-based compensation plans | 168 | 148
Shareholder investment plan, Amount |  | 698
Employee share purchase plan, Amount |  | 173
Number of shares issued, Amount | 17,179 | 17,101
Purchase of common shares for cancellation, Amount | (335) | (90)
Treasury shares, Amount | 1 |
Balance at end of year | $ 16,845 | $ 17,011

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