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Loans - Summary of Carrying Amount of Loans Based on Internal Risk Rating Grades (Detail) - CAD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jul. 31, 2025
Oct. 31, 2024
Apr. 30, 2025
Jul. 31, 2024
Disclosure of internal credit grades [line items]        
Gross residential mortgages $ 285,935 $ 280,672    
ECL allowance 4,285 3,917 $ 4,191 $ 3,920
Net loans 581,644 558,292    
Gross personal 47,259 46,681    
Gross credit card 21,321 20,551    
Gross business and government 231,414 214,305    
Exceptionally Low [Member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 171,982 166,645    
Gross personal 18,288 16,772    
Gross credit card 7,189 7,185    
Very Low [Member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 86,703 87,124    
Gross personal 10,859 9,697    
Gross credit card 457 502    
Low [Member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 13,853 13,967    
Gross personal 8,668 11,872    
Gross credit card 7,171 6,804    
Medium [Member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 7,711 7,385    
Gross personal 6,775 5,670    
Gross credit card 5,785 5,365    
High [Member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 1,502 1,568    
Gross personal 1,633 1,567    
Gross credit card 541 524    
Default [member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 1,034 790    
Gross personal 249 260    
Gross business and government 1,752 1,628    
Not Rated [member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 3,150 3,193    
Gross personal 787 843    
Gross credit card 178 171    
Gross business and government 243 245    
Investment grade [member]        
Disclosure of internal credit grades [line items]        
Gross business and government 115,021 102,531    
Non investment grade [member]        
Disclosure of internal credit grades [line items]        
Gross business and government 110,772 106,131    
Watchlist [member]        
Disclosure of internal credit grades [line items]        
Gross business and government 3,626 3,770    
Residential mortgages [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 555 449    
Net loans 285,380 280,223    
Personal [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 1,078 942    
Net loans 46,181 45,739    
Credit card [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 862 902    
Net loans 20,459 19,649    
Business and government [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 1,790 1,624    
Net loans 229,624 212,681    
Stage 1 [member] | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 272,513 255,657    
ECL allowance 992   844 684
Net loans 547,296 514,526    
Gross personal 41,052 41,967    
Gross credit card 19,321 18,507    
Gross business and government 215,402 199,195    
Stage 1 [member] | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | Exceptionally Low [Member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 171,858 160,515    
Gross personal 18,160 16,689    
Gross credit card 7,189 7,185    
Stage 1 [member] | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | Very Low [Member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 85,698 81,198    
Gross personal 10,582 9,685    
Gross credit card 457 502    
Stage 1 [member] | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | Low [Member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 11,133 10,329    
Gross personal 6,561 10,498    
Gross credit card 6,781 6,800    
Stage 1 [member] | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | Medium [Member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 1,065 851    
Gross personal 4,280 3,848    
Gross credit card 4,718 3,853    
Stage 1 [member] | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | High [Member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 6 7    
Gross personal 747 465    
Gross credit card 4 2    
Stage 1 [member] | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | Not Rated [member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 2,753 2,757    
Gross personal 722 782    
Gross credit card 172 165    
Gross business and government 231 230    
Stage 1 [member] | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | Investment grade [member]        
Disclosure of internal credit grades [line items]        
Gross business and government 114,274 101,809    
Stage 1 [member] | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | Non investment grade [member]        
Disclosure of internal credit grades [line items]        
Gross business and government 100,848 97,131    
Stage 1 [member] | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | Watchlist [member]        
Disclosure of internal credit grades [line items]        
Gross business and government 49 25    
Stage 1 [member] | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | Residential mortgages [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 99 89    
Net loans 272,414 255,568    
Stage 1 [member] | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | Personal [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 230 221    
Net loans 40,822 41,746    
Stage 1 [member] | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | Credit card [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 307 279    
Net loans 19,014 18,228    
Stage 1 [member] | Financial instruments not credit-impaired [member] | 12-month expected credit losses [member] | Business and government [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 356 211    
Net loans 215,046 198,984    
Stage 2 [member] | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 12,177 24,021    
ECL allowance 2,341   2,443 2,407
Net loans 32,019 41,668    
Gross personal 5,923 4,422    
Gross credit card 2,000 2,044    
Gross business and government 14,260 13,482    
Stage 2 [member] | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Exceptionally Low [Member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 124 6,130    
Gross personal 128 83    
Stage 2 [member] | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Very Low [Member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 1,005 5,926    
Gross personal 277 12    
Stage 2 [member] | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Low [Member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 2,720 3,638    
Gross personal 2,107 1,374    
Gross credit card 390 4    
Stage 2 [member] | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Medium [Member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 6,646 6,534    
Gross personal 2,495 1,822    
Gross credit card 1,067 1,512    
Stage 2 [member] | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | High [Member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 1,496 1,561    
Gross personal 886 1,102    
Gross credit card 537 522    
Stage 2 [member] | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Not Rated [member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 186 232    
Gross personal 30 29    
Gross credit card 6 6    
Gross business and government 12 15    
Stage 2 [member] | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Investment grade [member]        
Disclosure of internal credit grades [line items]        
Gross business and government 747 722    
Stage 2 [member] | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Non investment grade [member]        
Disclosure of internal credit grades [line items]        
Gross business and government 9,924 9,000    
Stage 2 [member] | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Watchlist [member]        
Disclosure of internal credit grades [line items]        
Gross business and government 3,577 3,745    
Stage 2 [member] | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Residential mortgages [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 158 126    
Net loans 12,019 23,895    
Stage 2 [member] | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Personal [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 664 531    
Net loans 5,259 3,891    
Stage 2 [member] | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Credit card [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 555 623    
Net loans 1,445 1,421    
Stage 2 [member] | Financial instruments not credit-impaired [member] | Lifetime expected credit losses [member] | Business and government [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 964 1,021    
Net loans 13,296 12,461    
Stage 3 [member] | Financial instruments credit-impaired [member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 1,245 994    
Net loans 2,329 2,098    
Gross personal 284 292    
Gross business and government 1,752 1,628    
Stage 3 [member] | Financial instruments credit-impaired [member] | Default [member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 1,034 790    
Gross personal 249 260    
Gross business and government 1,752 1,628    
Stage 3 [member] | Financial instruments credit-impaired [member] | Not Rated [member]        
Disclosure of internal credit grades [line items]        
Gross residential mortgages 211 204    
Gross personal 35 32    
Stage 3 [member] | Financial instruments credit-impaired [member] | Residential mortgages [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 298 234    
Net loans 947 760    
Stage 3 [member] | Financial instruments credit-impaired [member] | Personal [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 184 190    
Net loans 100 102    
Stage 3 [member] | Financial instruments credit-impaired [member] | Business and government [member]        
Disclosure of internal credit grades [line items]        
ECL allowance 470 392    
Net loans 1,282 $ 1,236    
Stage 3 [member] | Financial instruments credit-impaired [member] | Lifetime expected credit losses [member]        
Disclosure of internal credit grades [line items]        
ECL allowance $ 952   $ 904 $ 829