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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 6 Months Ended
Apr. 30, 2025
Jan. 31, 2025
Apr. 30, 2024
Apr. 30, 2025
Apr. 30, 2024
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance $ 1,304 $ 916 $ 1,031 $ 916 $ 953
Realized   (2) 1 (2) 2
Unrealized 28 4 (27) 32 64
Net unrealized gains (losses) included in OCI (15) 13 (8) (2) (14)
Transfer in to Level 3 393     393 2
Transfer out of Level 3   (5) (37) (5) (40)
Purchases/Issuances 215 416 45 631 126
Sales/Settlements (27) (38) (88) (65) (176)
Closing balance 1,898 1,304 917 1,898 917
Opening balance (1,718) (1,499) (1,372) (1,499) (2,116)
Realized 3 5 (4) 2 (8)
Unrealized 132 (333) (397) (201) 80
Transfer in to Level 3 (5) (3) (3) (8) (4)
Transfer out of Level 3 98 35 68 133 385
Purchases/Issuances (40) (1) (24) (41) (101)
Sales/Settlements 80 78 62 164 94
Closing balance (1,450) (1,718) (1,670) (1,450) (1,670)
Deposits and other liabilities [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance (379) (416) (399) (416) (242)
Realized 3 5 (4) 2 (9)
Unrealized 10 (23) 2 (13) (81)
Transfer in to Level 3   (3) (1) (3) (1)
Transfer out of Level 3 2 2 5 4 10
Purchases/Issuances (29) (1) (24) (30) (101)
Sales/Settlements 63 57 41 126 44
Closing balance (330) (379) (380) (330) (380)
Interest rate derivatives [member] | Derivative liabilities [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance (1,284) (1,028) (908) (1,028) (1,817)
Unrealized 155 (310) (386) (155) 183
Transfer out of Level 3 96 33 52 129 363
Sales/Settlements 17 21 20 38 49
Closing balance (1,016) (1,284) (1,222) (1,016) (1,222)
Interest rate derivatives [member] | Derivative Assets [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance 23 51 117 51 21
Unrealized 40 (23) (44) 17 53
Transfer out of Level 3   (5) (37) (5) (38)
Closing balance 63 23 36 63 36
Foreign exchange derivatives [member] | Derivative liabilities [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance   (4) (9) (4)  
Unrealized (36) 4 (13) (32) (22)
Transfer out of Level 3     9   9
Closing balance (36)   (13) (36) (13)
Foreign exchange derivatives [member] | Derivative Assets [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance 12        
Unrealized (12) 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 (54) (50) (50) (50) (52)
Realized         1
Unrealized 3 (4)   (1) 1
Transfer in to Level 3     (2)   (2)
Sales/Settlements     1   1
Closing balance (51) (54) (51) (51) (51)
Credit derivatives [member] | Derivative Assets [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance 49 44 45 44 46
Realized     (2)   (3)
Unrealized (3) 5 2 2 2
Purchases/Issuances     1   1
Closing balance 46 49 46 46 46
Equity derivatives [member] | Derivative liabilities [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance (1) (1) (6) (1) (5)
Unrealized         (1)
Transfer in to Level 3 (5)     (5) (1)
Transfer out of Level 3     2   3
Purchases/Issuances (11)     (11)  
Closing balance (17) (1) (4) (17) (4)
Equity derivatives [member] | Derivative Assets [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance 6 6 5 6 4
Unrealized 6     6  
Transfer in to Level 3 7     7 2
Transfer out of Level 3         (2)
Purchases/Issuances         2
Sales/Settlements         (1)
Closing balance 19 6 5 19 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 962 640 586 640 587
Realized   (2) 3 (2) 5
Unrealized 6 20 16 26 10
Net unrealized gains (losses) included in OCI (6) 9 (11) 3 (13)
Purchases/Issuances 30 304 32 334 62
Sales/Settlements (14) (9) (18) (23) (43)
Closing balance 978 962 608 978 608
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 72 70 147 70 151
Unrealized   (1)   (1) (3)
Transfer in to Level 3 386     386  
Purchases/Issuances   22 12 22 61
Sales/Settlements (4) (19) (58) (23) (108)
Closing balance 454 72 101 454 101
Corporate debt [member] | Debt securities measured at FVTPL [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance 80        
Unrealized (6) (10)   (16)  
Net unrealized gains (losses) included in OCI (4)     (4)  
Purchases/Issuances 7 90   97  
Closing balance 77 80   77  
Corporate debt [member] | Securities designated at FVTPL [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Closing balance 77     77  
Business and government [member] | Loans measured at FVTPL [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance 100 105 131 105 144
Unrealized (3) 1 (1) (2) 2
Net unrealized gains (losses) included in OCI (5) 4 3 (1) (1)
Purchases/Issuances 178     178  
Sales/Settlements (9) (10) (12) (19) (24)
Closing balance $ 261 $ 100 $ 121 $ 261 $ 121