v3.26.1
Loans and Allowance for Credit Losses - Summary of Key Economic Variables Used to Estimate Allowance on Performing Loans During Forecast Period (Details)
Jul. 31, 2026
Oct. 31, 2025
Upside | Canada | First 12 months    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 4.20% 3.60%
Corporate BBB 10-year spread 1.30% 1.20%
Unemployment rates 5.40% 6.00%
Housing Price Index 3.40% 3.90%
Upside | Canada | Remaining horizon    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 2.90% 2.80%
Corporate BBB 10-year spread 1.80% 1.80%
Unemployment rates 4.90% 5.50%
Housing Price Index 6.00% 5.80%
Upside | United States | First 12 months    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 4.20% 4.50%
Corporate BBB 10-year spread 1.00% 0.80%
Unemployment rates 3.80% 3.60%
Housing Price Index 5.50% 3.70%
Upside | United States | Remaining horizon    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 2.40% 2.40%
Corporate BBB 10-year spread 1.50% 1.50%
Unemployment rates 3.40% 3.10%
Housing Price Index 4.00% 3.90%
Base | Canada | First 12 months    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 1.40% 1.10%
Corporate BBB 10-year spread 1.90% 1.70%
Unemployment rates 6.50% 7.10%
Housing Price Index (1.70%) (0.40%)
Base | Canada | Remaining horizon    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 2.00% 2.10%
Corporate BBB 10-year spread 2.00% 2.00%
Unemployment rates 6.10% 6.40%
Housing Price Index 3.50% 3.40%
Base | United States | First 12 months    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 1.90% 1.70%
Corporate BBB 10-year spread 1.70% 1.50%
Unemployment rates 4.30% 4.50%
Housing Price Index 2.40% 0.70%
Base | United States | Remaining horizon    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 1.90% 1.80%
Corporate BBB 10-year spread 1.90% 1.90%
Unemployment rates 4.20% 4.40%
Housing Price Index 2.50% 2.40%
Downside | Canada | First 12 months    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates (2.80%) (2.70%)
Corporate BBB 10-year spread 3.60% 3.40%
Unemployment rates 9.20% 9.40%
Housing Price Index (10.80%) (10.50%)
Downside | Canada | Remaining horizon    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 1.50% 1.60%
Corporate BBB 10-year spread 3.00% 3.00%
Unemployment rates 9.40% 9.60%
Housing Price Index (0.20%) (0.70%)
Downside | United States | First 12 months    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates (2.40%) (2.30%)
Corporate BBB 10-year spread 3.70% 3.50%
Unemployment rates 6.90% 6.80%
Housing Price Index (2.20%) (11.60%)
Downside | United States | Remaining horizon    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 1.40% 1.40%
Corporate BBB 10-year spread 3.00% 3.00%
Unemployment rates 7.50% 7.50%
Housing Price Index (11.00%) (1.10%)
Severe downside | Canada | First 12 months    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates (4.10%) (4.00%)
Corporate BBB 10-year spread 4.20% 4.20%
Unemployment rates 9.90% 9.90%
Housing Price Index (20.00%) (19.40%)
Severe downside | Canada | Remaining horizon    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 1.20% 1.20%
Corporate BBB 10-year spread 3.50% 3.50%
Unemployment rates 10.40% 10.50%
Housing Price Index (5.00%) (5.00%)
Severe downside | United States | First 12 months    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates (3.60%) (3.50%)
Corporate BBB 10-year spread 4.60% 4.60%
Unemployment rates 7.80% 7.50%
Housing Price Index (4.80%) (20.00%)
Severe downside | United States | Remaining horizon    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 1.30% 1.30%
Corporate BBB 10-year spread 3.60% 3.60%
Unemployment rates 8.70% 8.40%
Housing Price Index (17.70%) (4.30%)