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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
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.