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Loans - Summary of Base Case Forecasts for Select Forward Looking Information Variables Used to Estimate our Expected Credit Losses (Detail) - Average Value [member] - USD ($) | 3 Months Ended
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Jul. 31, 2025 | Apr. 30, 2025 | Oct. 31, 2024
Base case [member] | Within 1 year [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Canadian Real GDP year-over-year growth | 1.00% | 0.80% | 1.60%
United States Real GDP year-over-year growth | 1.90% | 1.70% | 2.00%
Canadian unemployment rate | 6.80% | 6.90% | 6.60%
United States unemployment rate | 4.50% | 4.50% | 4.50%
Canadian Housing Price Index year-over-year growth | 0.40% | 1.50% | 2.60%
Canadian household debt service ratio | 14.50% | 14.60% | 14.80%
West Texas Intermediate Oil Price | $ 69 | $ 73 | $ 78
Base case [member] | Later than one year [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Canadian Real GDP year-over-year growth | 1.90% | 2.00% | 2.30%
United States Real GDP year-over-year growth | 1.90% | 2.00% | 2.00%
Canadian unemployment rate | 6.30% | 6.20% | 5.90%
United States unemployment rate | 4.10% | 4.10% | 4.00%
Canadian Housing Price Index year-over-year growth | 2.80% | 3.00% | 2.50%
Canadian household debt service ratio | 14.60% | 14.70% | 14.80%
West Texas Intermediate Oil Price | $ 71 | $ 74 | $ 74
Upside case [member] | Within 1 year [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Canadian Real GDP year-over-year growth | 2.00% | 2.00% | 2.50%
United States Real GDP year-over-year growth | 3.20% | 3.20% | 3.00%
Canadian unemployment rate | 6.10% | 6.20% | 5.70%
United States unemployment rate | 3.70% | 3.80% | 3.70%
Canadian Housing Price Index year-over-year growth | 4.70% | 4.70% | 7.10%
Canadian household debt service ratio | 14.10% | 14.10% | 14.40%
West Texas Intermediate Oil Price | $ 73 | $ 82 | $ 88
Upside case [member] | Later than one year [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Canadian Real GDP year-over-year growth | 2.50% | 2.70% | 2.70%
United States Real GDP year-over-year growth | 2.80% | 2.90% | 2.90%
Canadian unemployment rate | 5.70% | 5.50% | 5.20%
United States unemployment rate | 3.40% | 3.40% | 3.30%
Canadian Housing Price Index year-over-year growth | 4.90% | 5.70% | 4.00%
Canadian household debt service ratio | 14.30% | 14.30% | 14.70%
West Texas Intermediate Oil Price | $ 85 | $ 100 | $ 100
Downside case [member] | Within 1 year [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Canadian Real GDP year-over-year growth | (1.20%) | (0.30%) | 0.40%
United States Real GDP year-over-year growth | (0.30%) | 0.60% | 0.70%
Canadian unemployment rate | 7.90% | 8.00% | 7.20%
United States unemployment rate | 5.00% | 4.90% | 5.10%
Canadian Housing Price Index year-over-year growth | (4.20%) | (2.70%) | (2.30%)
Canadian household debt service ratio | 15.70% | 15.20% | 15.30%
West Texas Intermediate Oil Price | $ 55 | $ 60 | $ 60
Downside case [member] | Later than one year [member] |  |  |
Disclosure of internal credit grades [line items] |  |  |
Canadian Real GDP year-over-year growth | 1.10% | 1.10% | 1.40%
United States Real GDP year-over-year growth | 1.10% | 0.90% | 0.90%
Canadian unemployment rate | 7.00% | 7.00% | 6.80%
United States unemployment rate | 4.60% | 4.60% | 4.70%
Canadian Housing Price Index year-over-year growth | (0.40%) | 1.40% | 0.90%
Canadian household debt service ratio | 15.40% | 15.10% | 15.20%
West Texas Intermediate Oil Price | $ 60 | $ 60 | $ 61

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