Securities (Summary of Securities Net Realized Gains (Losses)) (Details) - Debt securities [member] $ in Millions, $ in Millions |
3 Months Ended | 9 Months Ended | ||||
|---|---|---|---|---|---|---|
|
Jul. 31, 2026
CAD ($)
|
Jul. 31, 2025
CAD ($)
|
Jul. 31, 2025
USD ($)
|
Jul. 31, 2026
CAD ($)
|
Jul. 31, 2025
CAD ($)
|
Jul. 31, 2025
USD ($)
|
|
| Classes Of Financial Assets [Domain] | ||||||
| Disclosure of financial assets [line items] | ||||||
| Net realized gains (losses) | $ 12 | $ (372) | $ 14 | $ (1,574) | ||
| Financial assets at amortised cost, category [member] | ||||||
| Disclosure of financial assets [line items] | ||||||
| Net realized gains (losses) | 8 | (337) | 8 | (1,533) | ||
| Financial assets at amortised cost, category [member] | Restructuring provision [member] | U.S. Retail [Member] | ||||||
| Disclosure of financial assets [line items] | ||||||
| Net realized gains (losses) | 339 | $ 244 | 1,546 | $ 1,092 | ||
| Financial assets at fair value through other comprehensive income, category [member] | ||||||
| Disclosure of financial assets [line items] | ||||||
| Net realized gains (losses) | $ 4 | $ (35) | $ 6 | $ (41) | ||