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Loans - Summary of Undrawn Credit Facilities and Other Off Balance Sheet Exposures (Detail) - CAD ($)
$ in Millions
Jul. 31, 2025
Apr. 30, 2025
Oct. 31, 2024
Jul. 31, 2024
Disclosure of internal credit grades [line items]        
Credit exposure $ 467,934   $ 440,411  
ECL allowance 303 $ 264   $ 198
Net credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 465,938   429,783  
Retail [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 180   94  
Retail [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 210,579   200,806  
Retail [member] | Net credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 210,399   200,712  
Retail [member] | Exceptionally Low [Member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 173,525   164,694  
Retail [member] | Very Low [Member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 14,911   15,116  
Retail [member] | Low [Member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 16,717   15,972  
Retail [member] | Medium [Member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 3,840   3,543  
Retail [member] | High [Member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 930   864  
Retail [member] | Default [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 46   43  
Retail [member] | Not Rated [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 610   574  
Business and government [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 123   103  
Business and government [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 255,662   229,174  
Business and government [member] | Net credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 255,539   229,071  
Business and government [member] | Investment grade [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 175,280   157,131  
Business and government [member] | Non-investment grade [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 78,188   69,806  
Business and government [member] | Watch list [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 902   906  
Business and government [member] | Default [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 224   123  
Business and government [member] | Not Rated [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 1,068   1,208  
Stage 1 [member] | 12-month expected credit losses [member] | Financial instruments not credit-impaired [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 119 114   90
Stage 1 [member] | 12-month expected credit losses [member] | Financial instruments not credit-impaired [member] | Net credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 457,026   422,227  
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 53   42  
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 206,250   197,830  
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Net credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 206,197   197,788  
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Exceptionally Low [Member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 173,343   164,577  
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Very Low [Member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 14,431   15,112  
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Low [Member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 14,949   14,988  
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Medium [Member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 2,418   2,263  
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | High [Member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 507   325  
Stage 1 [member] | 12-month expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Not Rated [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 602   565  
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 66   54  
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 250,895   224,493  
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Net credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 250,829   224,439  
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Investment grade [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 174,625   156,560  
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Non-investment grade [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 75,201   66,788  
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Watch list [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 57   28  
Stage 1 [member] | 12-month expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Not Rated [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 1,012   1,117  
Stage 2 [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 176 141   97
Stage 2 [member] | Lifetime expected credit losses [member] | Financial instruments not credit-impaired [member] | Net credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 8,650   7,399  
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 127   52  
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 4,283   2,933  
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Net credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 4,156   2,881  
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Exceptionally Low [Member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 182   117  
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Very Low [Member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 480   4  
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Low [Member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 1,768   984  
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Medium [Member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 1,422   1,280  
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | High [Member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 423   539  
Stage 2 [member] | Lifetime expected credit losses [member] | Retail [member] | Financial instruments not credit-impaired [member] | Not Rated [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 8   9  
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 49   40  
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 4,543   4,558  
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Net credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 4,494   4,518  
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Investment grade [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 655   571  
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Non-investment grade [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 2,987   3,018  
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Watch list [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 845   878  
Stage 2 [member] | Lifetime expected credit losses [member] | Business and government [member] | Financial instruments not credit-impaired [member] | Not Rated [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 56   91  
Stage 3 [member] | Financial instruments credit-impaired [member] | Net credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 262   157  
Stage 3 [member] | Retail [member] | Financial instruments credit-impaired [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 46   43  
Stage 3 [member] | Retail [member] | Financial instruments credit-impaired [member] | Net credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 46   43  
Stage 3 [member] | Retail [member] | Financial instruments credit-impaired [member] | Default [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 46   43  
Stage 3 [member] | Business and government [member] | Financial instruments credit-impaired [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 8   9  
Stage 3 [member] | Business and government [member] | Financial instruments credit-impaired [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 224   123  
Stage 3 [member] | Business and government [member] | Financial instruments credit-impaired [member] | Net credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 216   114  
Stage 3 [member] | Business and government [member] | Financial instruments credit-impaired [member] | Default [member] | Gross credit exposure [member]        
Disclosure of internal credit grades [line items]        
Credit exposure 224   $ 123  
Stage 3 [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]        
Disclosure of internal credit grades [line items]        
ECL allowance $ 8 $ 9   $ 11