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Loans - Summary of Undrawn Credit Facilities and Other Off Balance Sheet Exposures (Detail) - CAD ($)
$ in Millions
Jan. 31, 2025
Oct. 31, 2024
Jan. 31, 2024
Disclosure of internal credit grades [line items]      
Credit exposure $ 445,742 $ 440,411  
ECL allowance 272 197 $ 162
Net credit exposure [member]      
Disclosure of internal credit grades [line items]      
Credit exposure 444,716 429,783  
Retail [member]      
Disclosure of internal credit grades [line items]      
ECL allowance 175 94  
Retail [member] | Gross credit exposure [member]      
Disclosure of internal credit grades [line items]      
Credit exposure 203,643 200,806  
Retail [member] | Net credit exposure [member]      
Disclosure of internal credit grades [line items]      
Credit exposure 203,468 200,712  
Retail [member] | Exceptionally Low [Member] | Gross credit exposure [member]      
Disclosure of internal credit grades [line items]      
Credit exposure 166,173 164,694  
Retail [member] | Very Low [Member] | Gross credit exposure [member]      
Disclosure of internal credit grades [line items]      
Credit exposure 15,359 15,116  
Retail [member] | Low [Member] | Gross credit exposure [member]      
Disclosure of internal credit grades [line items]      
Credit exposure 16,860 15,972  
Retail [member] | Medium [Member] | Gross credit exposure [member]      
Disclosure of internal credit grades [line items]      
Credit exposure 3,747 3,543  
Retail [member] | High [Member] | Gross credit exposure [member]      
Disclosure of internal credit grades [line items]      
Credit exposure 870 864  
Retail [member] | Default [member] | Gross credit exposure [member]      
Disclosure of internal credit grades [line items]      
Credit exposure 45 43  
Retail [member] | Not Rated [member] | Gross credit exposure [member]      
Disclosure of internal credit grades [line items]      
Credit exposure 589 574  
Business and government [member]      
Disclosure of internal credit grades [line items]      
ECL allowance 97 103  
Business and government [member] | Gross credit exposure [member]      
Disclosure of internal credit grades [line items]      
Credit exposure 241,345 229,174  
Business and government [member] | Net credit exposure [member]      
Disclosure of internal credit grades [line items]      
Credit exposure 241,248 229,071  
Business and government [member] | Investment grade [member] | Gross credit exposure [member]      
Disclosure of internal credit grades [line items]      
Credit exposure 165,324 157,131  
Business and government [member] | Non-investment grade [member] | Gross credit exposure [member]      
Disclosure of internal credit grades [line items]      
Credit exposure 73,859 69,806  
Business and government [member] | Watch list [member] | Gross credit exposure [member]      
Disclosure of internal credit grades [line items]      
Credit exposure 910 906  
Business and government [member] | Default [member] | Gross credit exposure [member]      
Disclosure of internal credit grades [line items]      
Credit exposure 205 123  
Business and government [member] | Not Rated [member] | Gross credit exposure [member]      
Disclosure of internal credit grades [line items]      
Credit exposure 1,047 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 111 96 85
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 435,769 422,227  
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 55 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 199,285 197,830  
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 199,230 197,788  
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 165,728 164,577  
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 15,061 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 15,495 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 2,100 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 319 325  
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 582 565  
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 56 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 236,595 224,493  
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 236,539 224,439  
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 164,733 156,560  
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 70,837 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 20 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 1,005 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 152 92 76
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 8,706 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 120 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 4,313 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 4,193 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 445 117  
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 298 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 1,365 984  
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 1,647 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 551 539  
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 7 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 32 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 4,545 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 4,513 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 591 571  
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 3,022 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 890 878  
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 42 91  
Stage 3 [member] | Financial instruments credit-impaired [member] | Net credit exposure [member]      
Disclosure of internal credit grades [line items]      
Credit exposure 241 157  
Stage 3 [member] | Retail [member] | Financial instruments credit-impaired [member] | Gross credit exposure [member]      
Disclosure of internal credit grades [line items]      
Credit exposure 45 43  
Stage 3 [member] | Retail [member] | Financial instruments credit-impaired [member] | Net credit exposure [member]      
Disclosure of internal credit grades [line items]      
Credit exposure 45 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 45 43  
Stage 3 [member] | Business and government [member] | Financial instruments credit-impaired [member]      
Disclosure of internal credit grades [line items]      
ECL allowance 9 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 205 123  
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 196 114  
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 205 123  
Stage 3 [member] | Lifetime expected credit losses [member] | Financial instruments credit-impaired [member]      
Disclosure of internal credit grades [line items]      
ECL allowance $ 9 $ 9 $ 1