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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 9 Months Ended
Jul. 31, 2025
Apr. 30, 2025
Jul. 31, 2024
Jul. 31, 2025
Jul. 31, 2024
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance $ 1,898 $ 1,304 $ 917 $ 916 $ 953
Realized 3   2 1 4
Unrealized (53) 28 80 (21) 144
Net unrealized gains (losses) included in OCI 8 (15) (1) 6 (15)
Transfer in to Level 3 11 393   404 2
Transfer out of Level 3 (15)   (17) (20) (57)
Purchases/Issuances 202 215 38 833 164
Sales/Settlements (71) (27) (78) (136) (254)
Closing balance 1,983 1,898 941 1,983 941
Opening balance (1,450) (1,718) (1,670) (1,499) (2,116)
Realized (6) 3 19 (5)  
Unrealized (158) 132 172 (359) 266
Transfer in to Level 3   (5) (1) (8) (5)
Transfer out of Level 3 72 98 76 205 459
Purchases/Issuances (33) (40) (5) (74) (106)
Sales/Settlements 17 80 30 182 123
Closing balance (1,558) (1,450) (1,379) (1,558) (1,379)
Deposits and other liabilities [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance (330) (379) (380) (416) (242)
Realized (6) 3 19 (5) (1)
Unrealized (42) 10 (56) (55) (123)
Transfer in to Level 3     (1) (3) (2)
Transfer out of Level 3 1 2 3 5 11
Purchases/Issuances (27) (29) (1) (57) (102)
Sales/Settlements 27 63 28 154 71
Closing balance (377) (330) (388) (377) (388)
Interest rate derivatives [member] | Derivative liabilities [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance (1,016) (1,284) (1,222) (1,028) (1,817)
Unrealized (131) 155 233 (286) 416
Transfer out of Level 3 22 96 59 151 422
Purchases/Issuances     (4)   (4)
Sales/Settlements (10) 17   28 49
Closing balance (1,135) (1,016) (934) (1,135) (934)
Interest rate derivatives [member] | Derivative Assets [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance 63 23 36 51 21
Unrealized (8) 40 67 9 120
Transfer out of Level 3 (8)   (17) (13) (55)
Closing balance 47 63 86 47 86
Foreign exchange derivatives [member] | Derivative liabilities [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance (36)   (13) (4)  
Unrealized 1 (36) (5) (31) (27)
Transfer out of Level 3 35   13 35 22
Closing balance   (36) (5)   (5)
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)      
Credit derivatives [member] | Derivative liabilities [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance (51) (54) (51) (50) (52)
Realized         1
Unrealized 12 3   11 1
Transfer in to Level 3         (2)
Sales/Settlements         1
Closing balance (39) (51) (51) (39) (51)
Credit derivatives [member] | Derivative Assets [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance 46 49 46 44 46
Realized     (1)   (4)
Unrealized (12) (3) 1 (10) 3
Purchases/Issuances         1
Closing balance 34 46 46 34 46
Equity derivatives [member] | Derivative liabilities [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance (17) (1) (4) (1) (5)
Unrealized 2     2 (1)
Transfer in to Level 3   (5)   (5) (1)
Transfer out of Level 3 14   1 14 4
Purchases/Issuances (6) (11)   (17)  
Sales/Settlements     2   2
Closing balance (7) (17) (1) (7) (1)
Equity derivatives [member] | Derivative Assets [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance 19 6 5 6 4
Unrealized (4) 6 1 2 1
Transfer in to Level 3 11 7   18 2
Transfer out of Level 3 (7)     (7) (2)
Purchases/Issuances     3   5
Sales/Settlements         (1)
Closing balance 19 19 9 19 9
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 978 962 608 640 587
Realized 3   3 1 8
Unrealized 31 6 9 57 19
Net unrealized gains (losses) included in OCI 8 (6) (1) 11 (14)
Purchases/Issuances 32 30 26 366 88
Sales/Settlements (31) (14) (22) (54) (65)
Closing balance 1,021 978 623 1,021 623
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 454 72 101 70 151
Unrealized       (1) (3)
Transfer in to Level 3   386   386  
Purchases/Issuances 84   9 106 70
Sales/Settlements (33) (4) (46) (56) (154)
Closing balance 505 454 64 505 64
Corporate debt [member] | Debt securities measured at FVTPL [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance 77 80      
Unrealized (62) (6)   (78)  
Net unrealized gains (losses) included in OCI   (4)   (4)  
Purchases/Issuances 86 7   183  
Closing balance 101 77   101  
Business and government [member] | Loans measured at FVTPL [member]          
Disclosure of reconciliation of changes in fair value measurement assets liabilities [line items]          
Opening balance 261 100 121 105 144
Unrealized 2 (3) 2   4
Net unrealized gains (losses) included in OCI   (5)   (1) (1)
Purchases/Issuances   178   178  
Sales/Settlements (7) (9) (10) (26) (34)
Closing balance $ 256 $ 261 $ 113 $ 256 $ 113