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v3.25.1

Share capital - Schedule of Common Shares Issued (Detail) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Apr. 30, 2025 CAD ($) Shares shares | Jan. 31, 2025 CAD ($) shares | Apr. 30, 2024 CAD ($) Shares shares | Apr. 30, 2025 CAD ($) Shares shares | Apr. 30, 2024 CAD ($) Shares shares
Disclosure of classes of share capital [line items] |  |  |  |  |
Balance at beginning of period |  | $ 59,007 |  | $ 59,007 |
Balance at end of period | $ 61,946 |  | $ 55,656 | $ 61,946 | $ 55,656
Common shares [member] |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |
Beginning balance, Number of shares | shares | 940,081,255 | 942,294,598 | 937,223,345 | 942,294,598 | 931,098,941
Equity-settled share-based compensation plans, Number of shares | Shares | 143,000 |  | 313,852 | 1,404,526 | 692,877
Shareholder investment plan, Number of shares | shares |  |  | 4,693,884 | 629 | 9,811,613
Employee share purchase plan, Number of shares | shares |  |  | 786,615 |  | 1,457,807
Number of shares issued, Number of shares | shares | 940,224,255 |  | 943,017,696 | 943,699,753 | 943,061,238
Purchase of common shares for cancellation, Number of shares | shares | (6,000,000) |  |  | (9,500,000) |
Treasury shares, Number of shares | shares | 5,934 |  | (15,277) | 30,436 | (58,819)
Ending balance, Number of shares | shares | 934,230,189 | 940,081,255 | 943,002,419 | 934,230,189 | 943,002,419
Balance at beginning of period | $ 17,027 | $ 17,011 | $ 16,447 | $ 17,011 | $ 16,082
Equity-settled share-based compensation plans | 9 |  | 17 | 86 | 37
Shareholder investment plan, Amount |  |  | 299 |  | 607
Employee share purchase plan, Amount |  |  | 51 |  | 90
Number of shares issued, Amount | 17,036 |  | 16,814 | 17,097 | 16,816
Purchase of common shares for cancellation, Amount | (109) |  |  | (172) |
Treasury shares, Amount | 2 |  | (1) | 4 | (3)
Balance at end of period | $ 16,929 | $ 17,027 | $ 16,813 | $ 16,929 | $ 16,813

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