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Financial Instruments - Risk Management - Summary of Credit Risk Exposures (Detail) - CAD ($)
$ in Millions
Oct. 31, 2025
Oct. 31, 2024
Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1],[2]   $ 1,305,445
Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[2],[3] $ 952,601  
Undrawn commitments [1],[2] 231,693  
Other exposures [1],[2],[4] 172,034  
Total [1],[2] 1,356,328  
Canada [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1],[2]   783,178
Canada [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[2],[3] 587,309  
Undrawn commitments [1],[2] 175,314  
Other exposures [1],[2],[4] 49,503  
Total [1],[2] 812,126  
United States [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1],[2]   238,201
United States [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[2],[3] 137,005  
Undrawn commitments [1],[2] 31,646  
Other exposures [1],[2],[4] 83,209  
Total [1],[2] 251,860  
Chile [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1],[2]   60,179
Chile [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[2],[3] 54,340  
Undrawn commitments [1],[2] 4,645  
Other exposures [1],[2],[4] 3,588  
Total [1],[2] 62,573  
Mexico [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1],[2]   58,439
Mexico [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[2],[3] 52,283  
Undrawn commitments [1],[2] 3,901  
Other exposures [1],[2],[4] 3,183  
Total [1],[2] 59,367  
Peru [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1],[2]   32,609
Peru [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[2],[3] 29,386  
Undrawn commitments [1],[2] 2,187  
Other exposures [1],[2],[4] 2,194  
Total [1],[2] 33,767  
Colombia [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1],[2]   15,015
Colombia [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[2],[3] 15,435  
Undrawn commitments [1],[2] 1,777  
Other exposures [1],[2],[4] 941  
Total [1],[2] 18,153  
Europe [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1],[2]   38,776
Europe [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[2],[3] 17,423  
Undrawn commitments [1],[2] 6,241  
Other exposures [1],[2],[4] 22,195  
Total [1],[2] 45,859  
Caribbean [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1],[2]   36,170
Caribbean [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[2],[3] 32,841  
Undrawn commitments [1],[2] 2,152  
Other exposures [1],[2],[4] 1,250  
Total [1],[2] 36,243  
Latin America (other) [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1],[2]   17,742
Latin America (other) [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[2],[3] 15,218  
Undrawn commitments [1],[2] 948  
Other exposures [1],[2],[4] 1,080  
Total [1],[2] 17,246  
All other countries [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1],[2]   25,136
All other countries [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[2],[3] 11,361  
Undrawn commitments [1],[2] 2,882  
Other exposures [1],[2],[4] 4,891  
Total [1],[2] 19,134  
Non retail [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1]   766,014
Non retail [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[3] 518,634  
Undrawn commitments [1] 92,574  
Other exposures [1],[4] 171,958  
Total [1] 783,166  
Non retail [member] | IRB portfolio [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1]   673,106
Non retail [member] | IRB portfolio [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[3] 443,258  
Undrawn commitments [1] 87,081  
Other exposures [1],[4] 147,788  
Total [1] 678,127  
Non retail [member] | IRB portfolio [member] | Corporate segment [Member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1]   357,600
Non retail [member] | IRB portfolio [member] | Corporate segment [Member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[3] 189,918  
Undrawn commitments [1] 71,341  
Other exposures [1],[4] 113,508  
Total [1] 374,767  
Non retail [member] | IRB portfolio [member] | Bank [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1]   56,648
Non retail [member] | IRB portfolio [member] | Bank [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[3] 12,924  
Undrawn commitments [1] 12,253  
Other exposures [1],[4] 23,194  
Total [1] 48,371  
Non retail [member] | IRB portfolio [member] | Sovereign [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1]   258,858
Non retail [member] | IRB portfolio [member] | Sovereign [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[3] 240,416  
Undrawn commitments [1] 3,487  
Other exposures [1],[4] 11,086  
Total [1] 254,989  
Non retail [member] | Standardized portfolio [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total 105,000 93,000
Non retail [member] | Standardized portfolio [Member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1]   92,908
Non retail [member] | Standardized portfolio [Member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[3] 75,376  
Undrawn commitments [1] 5,493  
Other exposures [1],[4] 24,170  
Total [1] 105,039  
Non retail [member] | Standardized portfolio [Member] | Corporate segment [Member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1]   65,375
Non retail [member] | Standardized portfolio [Member] | Corporate segment [Member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[3] 49,395  
Undrawn commitments [1] 4,901  
Other exposures [1],[4] 23,786  
Total [1] 78,082  
Non retail [member] | Standardized portfolio [Member] | Bank [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1]   3,213
Non retail [member] | Standardized portfolio [Member] | Bank [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[3] 1,609  
Undrawn commitments [1] 69  
Other exposures [1],[4] 141  
Total [1] 1,819  
Non retail [member] | Standardized portfolio [Member] | Sovereign [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1]   24,320
Non retail [member] | Standardized portfolio [Member] | Sovereign [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[3] 24,372  
Undrawn commitments [1] 523  
Other exposures [1],[4] 243  
Total [1] 25,138  
Retail [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1]   539,431
Retail [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[3] 433,967  
Undrawn commitments [1] 139,119  
Other exposures [1],[4] 76  
Total [1] 573,162  
Retail [member] | IRB portfolio [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1],[5]   412,645
Retail [member] | IRB portfolio [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[3] 314,236  
Undrawn commitments [1] 128,704  
Total [1],[5] 442,940  
Retail [member] | IRB portfolio [member] | Real estate secured [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1]   306,395
Retail [member] | IRB portfolio [member] | Real estate secured [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[3] 267,856  
Undrawn commitments [1] 60,485  
Total [1] 328,341  
Retail [member] | IRB portfolio [member] | Qualifying revolving [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1]   67,585
Retail [member] | IRB portfolio [member] | Qualifying revolving [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[3] 18,710  
Undrawn commitments [1] 63,595  
Total [1],[5] 82,305  
Retail [member] | IRB portfolio [member] | Other retail [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1]   38,665
Retail [member] | IRB portfolio [member] | Other retail [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[3] 27,670  
Undrawn commitments [1] 4,624  
Total [1],[5] 32,294  
Retail [member] | Standardized portfolio [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total 130,000 127,000
Retail [member] | Standardized portfolio [Member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1]   126,786
Retail [member] | Standardized portfolio [Member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[3] 119,731  
Undrawn commitments [1] 10,415  
Other exposures [1],[4] 76  
Total [1] 130,222  
Retail [member] | Standardized portfolio [Member] | Real estate secured [member]    
Disclosure of detailed information about financial instruments [line items]    
Total 67,000 64,000
Retail [member] | Standardized portfolio [Member] | Real estate secured [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1]   63,572
Retail [member] | Standardized portfolio [Member] | Real estate secured [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[3] 67,179  
Undrawn commitments [1] 102  
Total [1] 67,281  
Retail [member] | Standardized portfolio [Member] | Other retail [member] | Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Total [1]   $ 63,214
Retail [member] | Standardized portfolio [Member] | Other retail [member] | Revised Basel Three Norms [Member]    
Disclosure of detailed information about financial instruments [line items]    
Drawn [1],[3] 52,552  
Undrawn commitments [1] 10,313  
Other exposures [1],[4] 76  
Total [1] $ 62,941  
[1] Exposure at default is presented after credit risk mitigation. Exposures exclude equity securities and other assets. Portfolios under the Standardized Approach are reported net of specific allowances for credit losses and net of collateral amounts treated under the Comprehensive Approach.
[2] Geographic segmentation is based upon the location of the ultimate risk of the credit exposure.
[3] Non-retail drawn includes loans, acceptances, deposits with financial institutions and FVOCI debt securities. Retail drawn includes residential mortgages, credit cards, lines of credit, other personal loans and small business treated as other regulatory retail.
[4] Other exposures include off-balance sheet lending instruments such as letters of credit, letters of guarantees, securitizations, derivatives and repo-style transactions (reverse repurchase agreements, repurchase agreements, securities lending and securities borrowing), net of related collateral.
[5] After credit risk mitigation.