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Fair Value Measurement - Summary of Financial Instruments Carried On Consolidated Balance Sheet at Fair Value (Detail) - CAD ($) $ in Millions | Jan. 31, 2025 | Oct. 31, 2024 | Jul. 31, 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] | $ 222,884 | $ 214,305 |  |  |
Residential mortgages |  | 282,675 | 280,672 |  |  |
Debt securities measured at FVOCI |  | 79,761 | 76,693 |  |  |
FVO securities purchased under resale agreements |  | 86,143 | 83,721 |  |  |
Derivative instruments |  | 38,572 | 36,435 |  |  |
Obligations related to securities sold short |  | 20,778 | 21,642 |  |  |
Obligations related to securities sold under repurchase agreements |  | 127,636 | 110,153 |  |  |
Derivative instruments |  | 44,902 | 40,654 |  |  |
At fair value [member] |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |
Debt securities measured at FVTPL |  | 47,678 | 45,254 |  |  |
Business and government |  | 713 | 221 |  |  |
Residential mortgages |  | 1 | 3 |  |  |
Loans measured at FVTPL |  | 714 | 224 |  |  |
Debt securities measured at FVOCI |  | 78,768 | 76,021 |  |  |
FVO securities purchased under resale agreements |  | 23,473 | 24,977 |  |  |
Derivative instruments |  | 38,572 | 36,435 |  |  |
Total financial assets |  | 262,192 | 244,735 |  |  |
Deposits and other liabilities |  | (40,363) | (39,706) |  |  |
Obligations related to securities sold short |  | (20,778) | (21,642) |  |  |
Obligations related to securities sold under repurchase agreements |  | (13,698) | (9,746) |  |  |
Derivative instruments |  | (44,902) | (40,654) |  |  |
Total financial liabilities |  | (119,741) | 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 |  | 37,591 | 36,586 |  |  |
Debt securities measured at FVOCI |  | 64,468 | 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 |  | 72,610 | 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 |  | 4,172 | 4,385 |  |  |
Debt securities measured at FVOCI |  | 10,007 | 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 |  | 5,915 | 4,283 |  |  |
Debt securities measured at FVOCI |  | 4,293 | 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 |  | 6,852 | 6,771 |  |  |
Derivative instruments |  | (9,692) | (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 |  | 19,140 | 15,525 |  |  |
Derivative instruments |  | (20,553) | (16,069) |  |  |
Credit derivatives [member] | At fair value [member] |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |
Derivative instruments |  | 52 | 46 |  |  |
Derivative instruments |  | (62) | (55) |  |  |
Equity derivatives [member] | At fair value [member] |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |
Derivative instruments |  | 10,004 | 10,984 |  |  |
Derivative instruments |  | (11,554) | (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 |  | 2,524 | 3,109 |  |  |
Derivative instruments |  | (3,041) | (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 |  | 377 | 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 |  | 4,003 | 4,258 |  |  |
Debt securities measured at FVOCI |  | 3,713 | 2,760 |  |  |
Derivative instruments |  | 5,402 | 5,855 |  |  |
Total financial assets |  | 83,758 | 72,777 |  |  |
Obligations related to securities sold short |  | (7,627) | (9,199) |  |  |
Derivative instruments |  | (4,422) | (4,753) |  |  |
Total financial liabilities |  | 12,049 | (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 |  | 4,003 | 4,258 |  |  |
Debt securities measured at FVOCI |  | 3,713 | 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 |  | 70,640 | 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 |  | 3 | 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 |  | 5,349 | 5,821 |  |  |
Derivative instruments |  | (4,379) | (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 |  | 50 | 32 |  |  |
Derivative instruments |  | (41) | (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 |  | 43,523 | 40,926 |  |  |
Business and government |  | 613 | 116 |  |  |
Residential mortgages |  | 1 | 3 |  |  |
Loans measured at FVTPL |  | 614 | 119 |  |  |
Debt securities measured at FVOCI |  | 75,055 | 73,261 |  |  |
FVO securities purchased under resale agreements |  | 23,473 | 24,977 |  |  |
Derivative instruments |  | 33,080 | 30,479 |  |  |
Total financial assets |  | 177,130 | 171,042 |  |  |
Deposits and other liabilities |  | (39,984) | (39,290) |  |  |
Obligations related to securities sold short |  | (13,151) | (12,443) |  |  |
Obligations related to securities sold under repurchase agreements |  | (13,698) | (9,746) |  |  |
Derivative instruments |  | (39,141) | (34,818) |  |  |
Total financial liabilities |  | (105,974) | (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 |  | 33,588 | 32,328 |  |  |
Debt securities measured at FVOCI |  | 60,755 | 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 |  | 1,008 | 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 |  | 4,092 | 4,385 |  |  |
Debt securities measured at FVOCI |  | 10,007 | 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 |  | 5,843 | 4,213 |  |  |
Debt securities measured at FVOCI |  | 4,293 | 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 |  | (8,406) | (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 |  | 19,128 | 15,525 |  |  |
Derivative instruments |  | (20,553) | (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 |  | 3 | 2 |  |  |
Derivative instruments |  | (8) | (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 |  | 4,649 | 5,157 |  |  |
Derivative instruments |  | (7,174) | (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 |  | 2,474 | 3,077 |  |  |
Derivative instruments |  | (3,000) | (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 |  | 377 | 364 |  |  |
Level 3 of fair value hierarchy [member] |  |  |  |  |  |
Disclosures Of Fair Value Hierarchy Of Financial Assets And Financial Liabilities [Line items] |  |  |  |  |  |
Total financial assets |  | 1,304 | 916 | $ 941 | $ 1,031 | $ 953
Total financial liabilities |  | (1,718) | (1,499) | $ (1,379) | $ (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 |  | 152 | 70 |  |  |
Business and government |  | 100 | 105 |  |  |
Loans measured at FVTPL |  | 100 | 105 |  |  |
Derivative instruments |  | 90 | 101 |  |  |
Total financial assets |  | 1,304 | 916 |  |  |
Deposits and other liabilities |  | (379) | (416) |  |  |
Derivative instruments |  | (1,339) | (1,083) |  |  |
Total financial liabilities |  | (1,718) | (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 |  | 962 | 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 |  | 80 |  |  |  |
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 |  | 72 | 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 |  | 23 | 51 |  |  |
Derivative instruments |  | (1,284) | (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 |  | 12 |  |  |  |
Derivative instruments |  | 0 | (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 |  | 49 | 44 |  |  |
Derivative instruments |  | (54) | (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 |  | 6 | 6 |  |  |
Derivative instruments |  | $ (1) | $ (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 current period presentation.

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