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IFRS 7 Disclosure - Credit and Counterparty Risk - Schedule of Total Credit Risk Exposures (Detail) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Disclosure of credit risk exposure [line items]    
Total exposure at default $ 1,189,564 $ 1,152,424
Individual sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 360,814 353,309
Financial institutions [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 152,980 178,414
Government sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 275,475 240,688
Manufacturing sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 53,288 51,861
Real estate sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 85,051 76,928
Retail trade sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 34,741 35,654
Service industries sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 77,954 72,445
Wholesale trade sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 31,188 30,018
Oil and gas sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 7,730 7,423
Utilities sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 25,771 25,615
Other sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 84,572 80,069
Drawn [Member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 917,167 898,000
Drawn [Member] | Individual sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 293,947 287,741
Drawn [Member] | Financial institutions [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 79,224 105,378
Drawn [Member] | Government sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 259,618 230,353
Drawn [Member] | Manufacturing sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 34,540 33,561
Drawn [Member] | Real estate sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 72,516 66,650
Drawn [Member] | Retail trade sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 29,470 30,595
Drawn [Member] | Service industries sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 59,153 54,433
Drawn [Member] | Wholesale trade sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 22,848 21,868
Drawn [Member] | Oil and gas sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 3,479 3,180
Drawn [Member] | Utilities sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 7,141 10,068
Drawn [Member] | Other sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 55,231 54,173
Undrawn commitments [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 181,819 170,128
Undrawn commitments [member] | Individual sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 66,867 65,568
Undrawn commitments [member] | Financial institutions [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 22,460 20,484
Undrawn commitments [member] | Government sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 3,137 3,024
Undrawn commitments [member] | Manufacturing sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 15,840 15,555
Undrawn commitments [member] | Real estate sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 10,750 8,632
Undrawn commitments [member] | Retail trade sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 4,258 4,262
Undrawn commitments [member] | Service industries sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 14,793 13,830
Undrawn commitments [member] | Wholesale trade sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 7,328 7,212
Undrawn commitments [member] | Oil and gas sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 3,064 3,010
Undrawn commitments [member] | Utilities sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 11,840 9,304
Undrawn commitments [member] | Other sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 21,482 19,247
Other off balance sheet items [Member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 24,348 25,409
Other off balance sheet items [Member] | Financial institutions [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 5,750 7,447
Other off balance sheet items [Member] | Government sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 1,663 1,760
Other off balance sheet items [Member] | Manufacturing sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 1,726 1,696
Other off balance sheet items [Member] | Real estate sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 1,265 1,234
Other off balance sheet items [Member] | Retail trade sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 855 645
Other off balance sheet items [Member] | Service industries sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 2,674 3,192
Other off balance sheet items [Member] | Wholesale trade sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 706 670
Other off balance sheet items [Member] | Oil and gas sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 510 623
Other off balance sheet items [Member] | Utilities sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 4,446 3,799
Other off balance sheet items [Member] | Other sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 4,753 4,343
Over the counter derivatives [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 45,048 40,105
Over the counter derivatives [member] | Financial institutions [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 26,790 27,393
Over the counter derivatives [member] | Government sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 8,631 4,481
Over the counter derivatives [member] | Manufacturing sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 1,182 1,049
Over the counter derivatives [member] | Real estate sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 520 412
Over the counter derivatives [member] | Retail trade sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 158 152
Over the counter derivatives [member] | Service industries sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 1,334 990
Over the counter derivatives [member] | Wholesale trade sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 306 268
Over the counter derivatives [member] | Oil and gas sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 677 610
Over the counter derivatives [member] | Utilities sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 2,344 2,444
Over the counter derivatives [member] | Other sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 3,106 2,306
Repo style transactions [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 21,182 18,782
Repo style transactions [member] | Individual sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 0  
Repo style transactions [member] | Financial institutions [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default 18,756 17,712
Repo style transactions [member] | Government sector [member]    
Disclosure of credit risk exposure [line items]    
Total exposure at default $ 2,426 $ 1,070