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Equity - Additional Information (Detail) $ / shares in Units, $ in Millions, $ in Millions |  |  | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  |
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Nov. 12, 2025 CAD ($) | Aug. 25, 2024 | Apr. 30, 2024 shares | Oct. 31, 2025 CAD ($) shares | Oct. 31, 2025 USD ($) $ / shares | Oct. 31, 2025 USD ($) shares | Sep. 02, 2025 shares | Aug. 25, 2025 CAD ($) shares | Jul. 29, 2025 USD ($) | Jan. 17, 2025 shares | Nov. 25, 2024 CAD ($) shares | Oct. 31, 2024 shares
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Description of conversion of preferred share |  |  |  | In such an event, each preferred share or other equity instrument is convertible into common shares pursuant to an automatic conversion formula and a conversion price based on the greater of: (i) a floor price of $5.00 and (ii) the current market price of our common shares based on the volume weighted-average trading price of our common shares on the TSX. | In such an event, each preferred share or other equity instrument is convertible into common shares pursuant to an automatic conversion formula and a conversion price based on the greater of: (i) a floor price of $5.00 and (ii) the current market price of our common shares based on the volume weighted-average trading price of our common shares on the TSX. |  |  |  |  |  |  |
Series Fifty Three Non Viability Contingent Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
BMO issued Non-cumulative, 5-year Rate Reset Class B Preferred Shares |  |  |  |  | $ 1,000 |  |  |  |  |  |  |
Series Fifty Four Non Viability Contingent Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
BMO issued Non-cumulative, 5-year Rate Reset Class B Preferred Shares |  |  |  |  | 750 |  |  |  |  |  |  |
Series Fifty Five Non Viability Contingent Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
BMO issued Non-cumulative, 5-year Rate Reset Class B Preferred Shares |  |  |  |  | $ 1,000 |  |  |  |  |  |  |
Series Fifty One of Non Viability Contingent Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
BMO issued Non-cumulative, 5-year Rate Reset Class B Preferred Shares |  |  |  | $ 1,000 |  |  |  |  |  |  |  |
Series 49 of Non Viability Contingent Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
BMO issued Non-cumulative, 5-year Rate Reset Class B Preferred Shares |  |  |  | $ 750 |  |  |  |  |  |  |  |
Stock Option Plan [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Common shares reserved for potential issuance | shares |  |  |  | 5,699,134 |  | 5,699,134 |  |  |  |  |  | 6,554,492
4.300% LRCNs, Series 1 [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Interest Rate | 4.30% |  |  |  |  |  |  |  |  |  |  |
4.800% AT1 Capital Notes (NVCC) [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Note issued face value |  |  |  |  |  | $ 500 |  |  |  |  |  |
Interest Rate |  | 4.80% |  | 6.709% | 6.709% |  |  |  |  |  |  |
Dividend reinvestment and share purchase plan [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Common shares reserved for potential issuance | shares |  |  |  | 39,864,838 |  | 39,864,838 |  |  |  |  |  | 39,864,838
Common shares [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Discount from treasury for shares issued under dividend reinvestment plan |  |  |  |  |  |  |  |  |  |  |  | 2.00%
Series 33 NVCC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Redeem all of our outstanding |  |  |  |  |  |  |  | $ 200 |  |  |  |
Redeemable preference shares, outstanding | shares |  |  |  |  |  |  |  | 8,000,000 |  |  |  |
Series 31 NVCC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Redeem all of our outstanding |  |  |  |  |  |  |  |  |  |  | $ 300 |
Redeemable preference shares, outstanding | shares |  |  |  |  |  |  |  |  |  |  | 12,000,000 |
Class B Series 48 Preferred Shares [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Redeem all of our outstanding | $ 1,250 |  |  |  |  |  |  |  |  |  |  |
Series 48 of Non Viability Contingent Capital [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
BMO issued Non-cumulative, 5-year Rate Reset Class B Preferred Shares |  |  |  | $ 1,250 |  |  |  |  |  |  |  |
Common shares [member] | September 2025 Normal Course Issuer Bid [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Program Number Of Shares Repurchased | shares |  |  |  | 5,800,000 |  | 5,800,000 |  |  |  |  |  |
Common shares [member] | January 2025 Normal Course Issuer Bid [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Program Number Of Shares Repurchased | shares |  |  |  | 16,400,000 |  | 16,400,000 |  |  |  |  |  |
Common shares [member] | Normal Course Issuer Bid [Member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Share Repurchase Program Authorized Amount |  |  |  | $ 3,461 |  |  |  |  |  |  |  |
Share Repurchase Program Price Per Share | $ / shares |  |  |  |  | $ 152.97 |  |  |  |  |  |  |
Share Repurchase Program Number Of Shares Repurchased | shares |  |  |  | 22,200,000 |  | 22,200,000 |  |  |  |  |  |
Number of shares repurchase under normal course issuer bid | shares |  |  |  |  |  |  | 30,000,000 |  |  | 20,000,000 |  |
Other Equity Instruments [member] | 7.300% Series 5 LRCNs [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Note issued face value |  |  |  |  |  | $ 750 |  |  |  |  |  |
Interest Rate |  |  |  | 7.30% | 7.30% |  |  |  |  |  |  |
Other Equity Instruments [member] | 7.700% Series 4 LRCNs [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Note issued face value |  |  |  |  |  | 1,000 |  |  |  |  |  |
Interest Rate |  |  |  | 7.70% | 7.70% |  |  |  |  |  |  |
Other Equity Instruments [member] | 4.300% LRCNs, Series 1 [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Note issued face value |  |  |  | $ 1,250 |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 4.30% | 4.30% |  |  |  |  |  |  |
Redeem all of our outstanding | $ 1,250 |  |  |  |  |  |  |  |  |  |  |
Other Equity Instruments [member] | 5.625% LRCNs, Series 2 [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Note issued face value |  |  |  | $ 750 |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 5.625% | 5.625% |  |  |  |  |  |  |
Other Equity Instruments [member] | 6.875% LRCNs, Series 6 [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Note issued face value |  |  |  |  |  | $ 1,000 |  |  | $ 1,000 |  |  |
Interest Rate |  |  |  | 6.875% | 6.875% |  |  |  |  |  |  |
Other Equity Instruments [member] | 7.325% LRCNs, Series 3 [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Note issued face value |  |  |  | $ 1,000 |  |  |  |  |  |  |  |
Interest Rate |  |  |  | 7.325% | 7.325% |  |  |  |  |  |  |
Shareholder Dividend Reinvestment and Share Purchase Plan [member] | Common shares [member] |  |  |  |  |  |  |  |  |  |  |  |
Disclosure of classes of share capital [line items] |  |  |  |  |  |  |  |  |  |  |  |
Number of shares issued under dividend reinvestment plan at 2% discount from treasury | shares |  |  | 7,790,724 |  |  |  |  |  |  |  |  |

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