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Fair Value Measurement - Summary of Financial Instruments Carried On Consolidated Balance Sheet at Fair Value (Detail) - CAD ($) $ in Millions | Apr. 30, 2025 | Jan. 31, 2025 | Oct. 31, 2024 | Apr. 30, 2024 | Jan. 31, 2024 | Oct. 31, 2023
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Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Business and government | [1] | $ 224,753 |  | $ 214,305 |  |  |
Residential mortgages |  | 283,437 |  | 280,672 |  |  |
Debt securities measured at FVOCI |  | 83,031 |  | 76,693 |  |  |
FVO securities purchased under resale agreements |  | 91,261 |  | 83,721 |  |  |
Derivative instruments |  | 38,490 |  | 36,435 |  |  |
Obligations related to securities sold short |  | 20,093 |  | 21,642 |  |  |
Obligations related to securities sold under repurchase agreements |  | 133,279 |  | 110,153 |  |  |
Derivative instruments |  | 43,945 |  | 40,654 |  |  |
At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Debt securities measured at FVTPL |  | 48,016 |  | 45,254 |  |  |
Business and government |  | 614 |  | 221 |  |  |
Residential mortgages |  | 3 |  | 3 |  |  |
Loans measured at FVTPL |  | 617 |  | 224 |  |  |
Debt securities measured at FVOCI |  | 82,075 |  | 76,021 |  |  |
FVO securities purchased under resale agreements |  | 23,357 |  | 24,977 |  |  |
Derivative instruments |  | 38,490 |  | 36,435 |  |  |
Total financial assets |  | 261,864 |  | 244,735 |  |  |
Deposits and other liabilities |  | (39,631) |  | (39,706) |  |  |
Obligations related to securities sold short |  | (20,093) |  | (21,642) |  |  |
Obligations related to securities sold under repurchase agreements |  | (11,546) |  | (9,746) |  |  |
Derivative instruments |  | (43,945) |  | (40,654) |  |  |
Total financial liabilities |  | (115,215) |  | (111,748) |  |  |
Government issued or guaranteed [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Debt securities measured at FVTPL |  | 38,762 |  | 36,586 |  |  |
Debt securities measured at FVOCI |  | 67,264 |  | 62,811 |  |  |
Corporate equity [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Equity securities mandatorily measured at FVTPL and designated at FVOCI |  | 68,723 |  | 61,460 |  |  |
Corporate debt [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Debt securities measured at FVTPL |  | 3,785 |  | 4,385 |  |  |
Debt securities measured at FVOCI |  | 9,724 |  | 9,083 |  |  |
Mortgage and asset backed [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Debt securities measured at FVTPL |  | 5,469 |  | 4,283 |  |  |
Debt securities measured at FVOCI |  | 5,087 |  | 4,127 |  |  |
Interest rate derivatives [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Derivative instruments |  | 7,098 |  | 6,771 |  |  |
Derivative instruments |  | (8,450) |  | (9,266) |  |  |
Foreign exchange derivatives [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Derivative instruments |  | 20,249 |  | 15,525 |  |  |
Derivative instruments |  | (22,791) |  | (16,069) |  |  |
Credit derivatives [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Derivative instruments |  | 51 |  | 46 |  |  |
Derivative instruments |  | (58) |  | (55) |  |  |
Equity derivatives [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Derivative instruments |  | 7,181 |  | 10,984 |  |  |
Derivative instruments |  | (8,474) |  | (11,117) |  |  |
Precious metal and other commodity derivatives [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Derivative instruments |  | 3,911 |  | 3,109 |  |  |
Derivative instruments |  | (4,172) |  | (4,147) |  |  |
Other assets [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Equity securities mandatorily measured at FVTPL and designated at FVOCI |  | 586 |  | 364 |  |  |
Level 1 of fair value hierarchy [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Debt securities measured at FVTPL |  | 7,681 |  | 4,258 |  |  |
Debt securities measured at FVOCI |  | 7,584 |  | 2,760 |  |  |
Derivative instruments |  | 3,678 |  | 5,855 |  |  |
Total financial assets |  | 85,751 |  | 72,777 |  |  |
Obligations related to securities sold short |  | (6,506) |  | (9,199) |  |  |
Derivative instruments |  | (3,843) |  | (4,753) |  |  |
Total financial liabilities |  | (10,349) |  | (13,952) |  |  |
Level 1 of fair value hierarchy [member] | Government issued or guaranteed [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Debt securities measured at FVTPL |  | 7,681 |  | 4,258 |  |  |
Debt securities measured at FVOCI |  | 7,584 |  | 2,760 |  |  |
Level 1 of fair value hierarchy [member] | Corporate equity [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Equity securities mandatorily measured at FVTPL and designated at FVOCI |  | 66,808 |  | 59,904 |  |  |
Level 1 of fair value hierarchy [member] | Interest rate derivatives [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Derivative instruments |  | 11 |  | 2 |  |  |
Derivative instruments |  | (12) |  | (2) |  |  |
Level 1 of fair value hierarchy [member] | Equity derivatives [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Derivative instruments |  | 3,571 |  | 5,821 |  |  |
Derivative instruments |  | (3,746) |  | (4,712) |  |  |
Level 1 of fair value hierarchy [member] | Precious metal and other commodity derivatives [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Derivative instruments |  | 96 |  | 32 |  |  |
Derivative instruments |  | (85) |  | (39) |  |  |
Level 2 of fair value hierarchy [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Debt securities measured at FVTPL |  | 39,804 |  | 40,926 |  |  |
Business and government |  | 353 |  | 116 |  |  |
Residential mortgages |  | 3 |  | 3 |  |  |
Loans measured at FVTPL |  | 356 |  | 119 |  |  |
Debt securities measured at FVOCI |  | 74,491 |  | 73,261 |  |  |
FVO securities purchased under resale agreements |  | 23,357 |  | 24,977 |  |  |
Derivative instruments |  | 34,684 |  | 30,479 |  |  |
Total financial assets |  | 174,215 |  | 171,042 |  |  |
Deposits and other liabilities |  | (39,301) |  | (39,290) |  |  |
Obligations related to securities sold short |  | (13,587) |  | (12,443) |  |  |
Obligations related to securities sold under repurchase agreements |  | (11,546) |  | (9,746) |  |  |
Derivative instruments |  | (38,982) |  | (34,818) |  |  |
Total financial liabilities |  | (103,416) |  | (96,297) |  |  |
Level 2 of fair value hierarchy [member] | Government issued or guaranteed [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Debt securities measured at FVTPL |  | 31,081 |  | 32,328 |  |  |
Debt securities measured at FVOCI |  | 59,680 |  | 60,051 |  |  |
Level 2 of fair value hierarchy [member] | Corporate equity [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Equity securities mandatorily measured at FVTPL and designated at FVOCI |  | 937 |  | 916 |  |  |
Level 2 of fair value hierarchy [member] | Corporate debt [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Debt securities measured at FVTPL |  | 3,708 |  | 4,385 |  |  |
Debt securities measured at FVOCI |  | 9,724 |  | 9,083 |  |  |
Level 2 of fair value hierarchy [member] | Mortgage and asset backed [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Debt securities measured at FVTPL |  | 5,015 |  | 4,213 |  |  |
Debt securities measured at FVOCI |  | 5,087 |  | 4,127 |  |  |
Level 2 of fair value hierarchy [member] | Interest rate derivatives [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Derivative instruments |  | 7,024 |  | 6,718 |  |  |
Derivative instruments |  | (7,422) |  | (8,236) |  |  |
Level 2 of fair value hierarchy [member] | Foreign exchange derivatives [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Derivative instruments |  | 20,249 |  | 15,525 |  |  |
Derivative instruments |  | (22,755) |  | (16,065) |  |  |
Level 2 of fair value hierarchy [member] | Credit derivatives [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Derivative instruments |  | 5 |  | 2 |  |  |
Derivative instruments |  | (7) |  | (5) |  |  |
Level 2 of fair value hierarchy [member] | Equity derivatives [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Derivative instruments |  | 3,591 |  | 5,157 |  |  |
Derivative instruments |  | (4,711) |  | (6,404) |  |  |
Level 2 of fair value hierarchy [member] | Precious metal and other commodity derivatives [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Derivative instruments |  | 3,815 |  | 3,077 |  |  |
Derivative instruments |  | (4,087) |  | (4,108) |  |  |
Level 2 of fair value hierarchy [member] | Other assets [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Equity securities mandatorily measured at FVTPL and designated at FVOCI |  | 586 |  | 364 |  |  |
Level 3 of fair value hierarchy [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Total financial assets |  | 1,898 | $ 1,304 | 916 | $ 917 | $ 1,031 | $ 953
Total financial liabilities |  | (1,450) | $ (1,718) | (1,499) | $ (1,670) | $ (1,372) | $ (2,116)
Level 3 of fair value hierarchy [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Debt securities measured at FVTPL |  | 531 |  | 70 |  |  |
Business and government |  | 261 |  | 105 |  |  |
Loans measured at FVTPL |  | 261 |  | 105 |  |  |
Derivative instruments |  | 128 |  | 101 |  |  |
Total financial assets |  | 1,898 |  | 916 |  |  |
Deposits and other liabilities |  | (330) |  | (416) |  |  |
Derivative instruments |  | (1,120) |  | (1,083) |  |  |
Total financial liabilities |  | (1,450) |  | (1,499) |  |  |
Level 3 of fair value hierarchy [member] | Corporate equity [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Equity securities mandatorily measured at FVTPL and designated at FVOCI |  | 978 |  | 640 |  |  |
Level 3 of fair value hierarchy [member] | Corporate debt [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Debt securities measured at FVTPL |  | 77 |  |  |  |  |
Level 3 of fair value hierarchy [member] | Mortgage and asset backed [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Debt securities measured at FVTPL |  | 454 |  | 70 |  |  |
Level 3 of fair value hierarchy [member] | Interest rate derivatives [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Derivative instruments |  | 63 |  | 51 |  |  |
Derivative instruments |  | (1,016) |  | (1,028) |  |  |
Level 3 of fair value hierarchy [member] | Foreign exchange derivatives [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Derivative instruments |  | (36) |  | (4) |  |  |
Level 3 of fair value hierarchy [member] | Credit derivatives [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Derivative instruments |  | 46 |  | 44 |  |  |
Derivative instruments |  | (51) |  | (50) |  |  |
Level 3 of fair value hierarchy [member] | Equity derivatives [member] | At fair value [member] |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |
Derivative instruments |  | 19 |  | 6 |  |  |
Derivative instruments |  | $ (17) |  | $ (1) |  |  |
[1] | Includes customers’ liability under acceptances of $10 million (October 31, 2024: $6 million) in business and government loans and acceptances of $10 million (October 31, 2024: $6 million) in other liabilities. Prior period amounts have been revised to conform to the presentation adopted in the first quarter of 2025.

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