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Fair Value Measurement - Changes in Fair Value of Financial Assets and Liabilities in Level 3 (Detail) - Level 3 of fair value hierarchy [member] - CAD ($)
$ in Millions
 3 Months Ended
Jan. 31, 2025
Oct. 31, 2024
Jan. 31, 2024
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Opening balance $ 916 $ 941 $ 953
Realized (2) (3) 1
Unrealized 4 (15) 91
Net unrealized gains (losses) included in OCI 13 (2) (6)
Transfer in to Level 3     2
Transfer out of Level 3 (5) (16) (3)
Purchases/Issuances 416 40 81
Sales/Settlements (38) (29) (88)
Closing balance 1,304 916 1,031
Opening balance (1,499) (1,379) (2,116)
Realized 5 2 10
Unrealized (333) (175) 446
Transfer in to Level 3 (3) (2) (1)
Transfer out of Level 3 35 10 319
Purchases/Issuances (1) (22) (77)
Sales/Settlements 78 67 47
Closing balance (1,718) (1,499) (1,372)
Deposits and other liabilities [member]      
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Opening balance (416) (388) (242)
Realized 5 2 9
Unrealized (23) (52) (114)
Transfer in to Level 3 (3)    
Transfer out of Level 3 2 2 7
Purchases/Issuances (1) (18) (77)
Sales/Settlements 57 38 18
Closing balance (379) (416) (399)
Interest rate derivatives [member] | Derivative liabilities [member]      
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Opening balance (1,028) (934) (1,817)
Unrealized (310) (119) 569
Transfer out of Level 3 33 3 311
Purchases/Issuances   (4)  
Sales/Settlements 21 26 29
Closing balance (1,284) (1,028) (908)
Interest rate derivatives [member] | Derivative Assets [member]      
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Opening balance 51 86 21
Unrealized (23) (23) 97
Transfer out of Level 3 (5) (12) (1)
Closing balance 23 51 117
Foreign exchange derivatives [member] | Derivative liabilities [member]      
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Opening balance (4) (5)  
Unrealized 4 (4) (9)
Transfer out of Level 3   5  
Closing balance   (4) (9)
Foreign exchange derivatives [member] | Derivative Assets [member]      
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Unrealized 12    
Closing balance 12    
Credit derivatives [member] | Derivative liabilities [member]      
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Opening balance (50) (51) (52)
Realized     1
Unrealized (4)   1
Sales/Settlements   1  
Closing balance (54) (50) (50)
Credit derivatives [member] | Derivative Assets [member]      
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Opening balance 44 46 46
Realized   (2) (1)
Unrealized 5 (1)  
Purchases/Issuances   1  
Closing balance 49 44 45
Equity derivatives [member] | Derivative liabilities [member]      
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Opening balance (1) (1) (5)
Unrealized     (1)
Transfer in to Level 3   (2) (1)
Transfer out of Level 3     1
Sales/Settlements   2  
Closing balance (1) (1) (6)
Equity derivatives [member] | Derivative Assets [member]      
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Opening balance 6 9 4
Unrealized   1  
Transfer in to Level 3     2
Transfer out of Level 3   (4) (2)
Purchases/Issuances     2
Sales/Settlements     (1)
Closing balance 6 6 5
Corporate equity [member] | Equity securities mandatorily measured at FVTPL and designated at FVOCI [Member]      
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Opening balance 640 623 587
Realized (2) (1) 2
Unrealized 20 7 (6)
Net unrealized gains (losses) included in OCI 9 (3) (2)
Purchases/Issuances 304 25 30
Sales/Settlements (9) (11) (25)
Closing balance 962 640 586
Mortgage and asset backed [member] | Debt securities measured at FVTPL [member]      
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Opening balance 70 64 151
Unrealized (1)   (3)
Purchases/Issuances 22 14 49
Sales/Settlements (19) (8) (50)
Closing balance 72 70 147
Corporate debt [member] | Debt securities measured at FVTPL [member]      
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Unrealized (10)    
Purchases/Issuances 90    
Closing balance 80    
Business and government [member] | Loans measured at FVTPL [member]      
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]      
Opening balance 105 113 144
Unrealized 1 1 3
Net unrealized gains (losses) included in OCI 4 1 (4)
Sales/Settlements (10) (10) (12)
Closing balance $ 100 $ 105 $ 131