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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
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.