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Fair Value Measurement - Summary of Financial Instruments Carried On Consolidated Balance Sheet at Fair Value (Detail) - CAD ($) $ in Millions | Jul. 31, 2025 | Apr. 30, 2025 | Jan. 31, 2025 | Oct. 31, 2024 | Jul. 31, 2024 | Apr. 30, 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] | $ 231,414 |  |  | $ 214,305 |  |  |
Residential mortgages |  | 285,935 |  |  | 280,672 |  |  |
Debt securities measured at FVOCI |  | 84,093 |  |  | 76,693 |  |  |
FVO securities purchased under resale agreements |  | 86,210 |  |  | 83,721 |  |  |
Derivative instruments |  | (34,614) |  |  | (36,435) |  |  |
Obligations related to securities sold short |  | (20,827) |  |  | (21,642) |  |  |
Obligations related to securities sold under repurchase agreements |  | (145,659) |  |  | (110,153) |  |  |
Derivative instruments |  | (36,552) |  |  | (40,654) |  |  |
At fair value [member] |  |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |  |
Debt securities measured at FVTPL |  | 48,617 |  |  | 45,254 |  |  |
Business and government |  | 459 |  |  | 221 |  |  |
Residential mortgages |  | 5 |  |  | 3 |  |  |
Loans measured at FVTPL |  | 464 |  |  | 224 |  |  |
Debt securities measured at FVOCI |  | 83,135 |  |  | 76,021 |  |  |
FVO securities purchased under resale agreements |  | 22,280 |  |  | 24,977 |  |  |
Derivative instruments |  | 34,614 |  |  | 36,435 |  |  |
Total financial assets |  | 264,153 |  |  | 244,735 |  |  |
Deposits and other liabilities |  | (42,454) |  |  | (39,706) |  |  |
Obligations related to securities sold short |  | (20,827) |  |  | (21,642) |  |  |
Obligations related to securities sold under repurchase agreements |  | (10,808) |  |  | (9,746) |  |  |
Derivative instruments |  | (36,552) |  |  | (40,654) |  |  |
Total financial liabilities |  | (110,641) |  |  | (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 |  | 38,223 |  |  | 36,586 |  |  |
Debt securities measured at FVOCI |  | 68,013 |  |  | 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 |  | 74,433 |  |  | 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 |  | 3,702 |  |  | 4,385 |  |  |
Debt securities measured at FVOCI |  | 9,998 |  |  | 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 |  | 6,692 |  |  | 4,283 |  |  |
Debt securities measured at FVOCI |  | 5,124 |  |  | 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 |  | 6,875 |  |  | 6,771 |  |  |
Derivative instruments |  | (8,590) |  |  | (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 |  | 15,863 |  |  | 15,525 |  |  |
Derivative instruments |  | (13,870) |  |  | (16,069) |  |  |
Credit derivatives [member] | At fair value [member] |  |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |  |
Derivative instruments |  | 36 |  |  | 46 |  |  |
Derivative instruments |  | (45) |  |  | (55) |  |  |
Equity derivatives [member] | At fair value [member] |  |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |  |
Derivative instruments |  | 9,043 |  |  | 10,984 |  |  |
Derivative instruments |  | (11,295) |  |  | (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 |  | 2,797 |  |  | 3,109 |  |  |
Derivative instruments |  | (2,752) |  |  | (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 |  | 610 |  |  | 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 |  | 3,558 |  |  | 4,258 |  |  |
Debt securities measured at FVOCI |  | 10,466 |  |  | 2,760 |  |  |
Derivative instruments |  | 4,894 |  |  | 5,855 |  |  |
Total financial assets |  | 91,325 |  |  | 72,777 |  |  |
Obligations related to securities sold short |  | (7,040) |  |  | (9,199) |  |  |
Derivative instruments |  | (4,434) |  |  | (4,753) |  |  |
Total financial liabilities |  | (11,474) |  |  | (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 |  | 3,558 |  |  | 4,258 |  |  |
Debt securities measured at FVOCI |  | 10,466 |  |  | 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 |  | 72,407 |  |  | 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 |  | 2 |  |  | 2 |  |  |
Derivative instruments |  | (2) |  |  | (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 |  | 4,855 |  |  | 5,821 |  |  |
Derivative instruments |  | (4,389) |  |  | (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 |  | 37 |  |  | 32 |  |  |
Derivative instruments |  | (43) |  |  | (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 |  | 44,453 |  |  | 40,926 |  |  |
Business and government |  | 203 |  |  | 116 |  |  |
Residential mortgages |  | 5 |  |  | 3 |  |  |
Loans measured at FVTPL |  | 208 |  |  | 119 |  |  |
Debt securities measured at FVOCI |  | 72,669 |  |  | 73,261 |  |  |
FVO securities purchased under resale agreements |  | 22,280 |  |  | 24,977 |  |  |
Derivative instruments |  | 29,620 |  |  | 30,479 |  |  |
Total financial assets |  | 170,845 |  |  | 171,042 |  |  |
Deposits and other liabilities |  | (42,077) |  |  | (39,290) |  |  |
Obligations related to securities sold short |  | (13,787) |  |  | (12,443) |  |  |
Obligations related to securities sold under repurchase agreements |  | (10,808) |  |  | (9,746) |  |  |
Derivative instruments |  | (30,937) |  |  | (34,818) |  |  |
Total financial liabilities |  | (97,609) |  |  | (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 |  | 34,665 |  |  | 32,328 |  |  |
Debt securities measured at FVOCI |  | 57,547 |  |  | 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 |  | 1,005 |  |  | 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 |  | 3,601 |  |  | 4,385 |  |  |
Debt securities measured at FVOCI |  | 9,998 |  |  | 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 |  | 6,187 |  |  | 4,213 |  |  |
Debt securities measured at FVOCI |  | 5,124 |  |  | 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 |  | 6,826 |  |  | 6,718 |  |  |
Derivative instruments |  | (7,453) |  |  | (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 |  | 15,863 |  |  | 15,525 |  |  |
Derivative instruments |  | (13,870) |  |  | (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 |  | 2 |  |  | 2 |  |  |
Derivative instruments |  | (6) |  |  | (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 |  | 4,169 |  |  | 5,157 |  |  |
Derivative instruments |  | (6,899) |  |  | (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 |  | 2,760 |  |  | 3,077 |  |  |
Derivative instruments |  | (2,709) |  |  | (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 |  | 610 |  |  | 364 |  |  |
Level 3 of fair value hierarchy [member] |  |  |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |  |  |
Total financial assets |  | 1,983 | $ 1,898 | $ 1,304 | 916 | $ 941 | $ 917 | $ 953
Total financial liabilities |  | (1,558) | $ (1,450) | $ (1,718) | (1,499) | $ (1,379) | $ (1,670) | $ (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 |  | 606 |  |  | 70 |  |  |
Business and government |  | 256 |  |  | 105 |  |  |
Loans measured at FVTPL |  | 256 |  |  | 105 |  |  |
Derivative instruments |  | 100 |  |  | 101 |  |  |
Total financial assets |  | 1,983 |  |  | 916 |  |  |
Deposits and other liabilities |  | (377) |  |  | (416) |  |  |
Derivative instruments |  | (1,181) |  |  | (1,083) |  |  |
Total financial liabilities |  | (1,558) |  |  | (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 |  | 1,021 |  |  | 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 |  | 101 |  |  |  |  |  |
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 |  | 505 |  |  | 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 |  | 47 |  |  | 51 |  |  |
Derivative instruments |  | (1,135) |  |  | (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 |  |  |  |  | (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 |  | 34 |  |  | 44 |  |  |
Derivative instruments |  | (39) |  |  | (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 |  | $ (7) |  |  | $ (1) |  |  |
[1] | Includes customers’ liability under acceptances of $8 million (October 31, 2024: $6 million) in business and government loans and acceptances of $8 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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