Securities (Summary of Securities Net Realized Gains (Losses)) (Details) - Debt securities [member] $ in Millions, $ in Millions |
3 Months Ended | 6 Months Ended | ||||
|---|---|---|---|---|---|---|
|
Apr. 30, 2026
CAD ($)
|
Apr. 30, 2025
CAD ($)
|
Apr. 30, 2025
USD ($)
|
Apr. 30, 2026
CAD ($)
|
Apr. 30, 2025
CAD ($)
|
Apr. 30, 2025
USD ($)
|
|
| Classes Of Financial Assets [Domain] | ||||||
| Disclosure of financial assets [line items] | ||||||
| Net realized gains (losses) | $ (1) | $ (282) | $ 2 | $ (1,202) | ||
| Financial assets at amortised cost, category [member] | ||||||
| Disclosure of financial assets [line items] | ||||||
| Net realized gains (losses) | 1 | (285) | 0 | (1,196) | ||
| Financial assets at amortised cost, category [member] | Restructuring provision [member] | U.S. Retail [Member] | ||||||
| Disclosure of financial assets [line items] | ||||||
| Net realized gains (losses) | 284 | $ 199 | 1,207 | $ 848 | ||
| Financial assets at fair value through other comprehensive income, category [member] | ||||||
| Disclosure of financial assets [line items] | ||||||
| Net realized gains (losses) | $ (2) | $ 3 | $ 2 | $ (6) | ||