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Loans and Allowance for Credit Losses - Summary of Key Economic Variables Used to Estimate Allowance on Performing Loans During Forecast Period (Detail)
Oct. 31, 2025
Oct. 31, 2024
Upside Scenarios [member] | Canada [member] | First 12 months [member]    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 3.60% 4.60%
Corporate BBB 1.20% 1.30%
Unemployment rates 6.00% 5.30%
Housing Price Index 3.90% 5.90%
Upside Scenarios [member] | Canada [member] | Remaining horizon [member]    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 2.80% 2.60%
Corporate BBB 1.80% 1.80%
Unemployment rates 5.50% 4.80%
Housing Price Index 5.80% 5.40%
Upside Scenarios [member] | United States [member] | First 12 months [member]    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 4.50% 4.30%
Corporate BBB 0.80% 0.90%
Unemployment rates 3.60% 3.40%
Housing Price Index 3.70% 5.90%
Upside Scenarios [member] | United States [member] | Remaining horizon [member]    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 2.40% 2.40%
Corporate BBB 1.50% 1.60%
Unemployment rates 3.10% 3.00%
Housing Price Index 3.90% 4.00%
Base Scenarios [member] | Canada [member] | First 12 months [member]    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 1.10% 1.80%
Corporate BBB 1.70% 1.90%
Unemployment rates 7.10% 7.00%
Housing Price Index (0.40%) 1.60%
Base Scenarios [member] | Canada [member] | Remaining horizon [member]    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 2.10% 1.90%
Corporate BBB 2.00% 2.00%
Unemployment rates 6.40% 6.80%
Housing Price Index 3.40% 3.00%
Base Scenarios [member] | United States [member] | First 12 months [member]    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 1.70% 1.90%
Corporate BBB 1.50% 1.60%
Unemployment rates 4.50% 4.70%
Housing Price Index 0.70% 2.80%
Base Scenarios [member] | United States [member] | Remaining horizon [member]    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 1.80% 1.90%
Corporate BBB 1.90% 2.00%
Unemployment rates 4.40% 4.40%
Housing Price Index 2.40% 2.60%
Downside Scenarios [member] | Canada [member] | First 12 months [member]    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates (2.70%) (2.30%)
Corporate BBB 3.40% 3.60%
Unemployment rates 9.40% 8.80%
Housing Price Index (10.50%) (10.90%)
Downside Scenarios [member] | Canada [member] | Remaining horizon [member]    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 1.60% 1.30%
Corporate BBB 3.00% 3.00%
Unemployment rates 9.60% 9.40%
Housing Price Index (0.70%) (1.00%)
Downside Scenarios [member] | United States [member] | First 12 months [member]    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates (2.30%) (2.10%)
Corporate BBB 3.50% 3.40%
Unemployment rates 6.80% 6.70%
Housing Price Index (11.60%) (9.60%)
Downside Scenarios [member] | United States [member] | Remaining horizon [member]    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 1.40% 1.40%
Corporate BBB 3.00% 3.10%
Unemployment rates 7.50% 7.30%
Housing Price Index (1.10%) (1.00%)
Severe Downside Scenario [member] | Canada [member] | First 12 months [member]    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates (4.00%) (3.60%)
Corporate BBB 4.20% 4.20%
Unemployment rates 9.90% 9.80%
Housing Price Index (19.40%) (19.00%)
Severe Downside Scenario [member] | Canada [member] | Remaining horizon [member]    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 1.20% 1.20%
Corporate BBB 3.50% 3.50%
Unemployment rates 10.50% 10.50%
Housing Price Index (5.00%) (5.00%)
Severe Downside Scenario [member] | United States [member] | First 12 months [member]    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates (3.50%) (3.40%)
Corporate BBB 4.60% 4.60%
Unemployment rates 7.50% 7.60%
Housing Price Index (20.00%) (19.30%)
Severe Downside Scenario [member] | United States [member] | Remaining horizon [member]    
Disclosure of detailed information about financial instruments [line items]    
Real GDP growth rates 1.30% 1.30%
Corporate BBB 3.60% 3.60%
Unemployment rates 8.40% 8.40%
Housing Price Index (4.30%) (4.30%)