IFRS 7 Disclosure - Market Risk - Summary of Market Risk Structural Interest Rate Sensitivities Measures (Detail) - CAD ($) $ in Millions	12 Months Ended
	Oct. 31, 2024	Oct. 31, 2023
100 bps increase in rates [member] \| EVE risk [member]
Disclosure of Structural Interest Rate Sensitivity on NII and EVE [line items]
Increase (decrease) in rates before tax impact	$ (2,076)	$ (1,552)
100 bps increase in rates [member] \| NII risk [member]
Disclosure of Structural Interest Rate Sensitivity on NII and EVE [line items]
Increase (decrease) in rates before tax impact	400	651
100 bps decrease in rates [member] \| EVE risk [member]
Disclosure of Structural Interest Rate Sensitivity on NII and EVE [line items]
Increase (decrease) in rates before tax impact	1,663	1,353
100 bps decrease in rates [member] \| NII risk [member]
Disclosure of Structural Interest Rate Sensitivity on NII and EVE [line items]
Increase (decrease) in rates before tax impact	(502)	$ (751)
Canadian dollar [member] \| 100 bps increase in rates [member] \| EVE risk [member]
Disclosure of Structural Interest Rate Sensitivity on NII and EVE [line items]
Increase (decrease) in rates before tax impact	(1,775)
Canadian dollar [member] \| 100 bps increase in rates [member] \| NII risk [member]
Disclosure of Structural Interest Rate Sensitivity on NII and EVE [line items]
Increase (decrease) in rates before tax impact	264
Canadian dollar [member] \| 100 bps decrease in rates [member] \| EVE risk [member]
Disclosure of Structural Interest Rate Sensitivity on NII and EVE [line items]
Increase (decrease) in rates before tax impact	1,705
Canadian dollar [member] \| 100 bps decrease in rates [member] \| NII risk [member]
Disclosure of Structural Interest Rate Sensitivity on NII and EVE [line items]
Increase (decrease) in rates before tax impact	(315)
U.S. dollars [member] \| 100 bps increase in rates [member] \| EVE risk [member]
Disclosure of Structural Interest Rate Sensitivity on NII and EVE [line items]
Increase (decrease) in rates before tax impact	(301)
U.S. dollars [member] \| 100 bps increase in rates [member] \| NII risk [member]
Disclosure of Structural Interest Rate Sensitivity on NII and EVE [line items]
Increase (decrease) in rates before tax impact	136
U.S. dollars [member] \| 100 bps decrease in rates [member] \| EVE risk [member]
Disclosure of Structural Interest Rate Sensitivity on NII and EVE [line items]
Increase (decrease) in rates before tax impact	(42)
U.S. dollars [member] \| 100 bps decrease in rates [member] \| NII risk [member]
Disclosure of Structural Interest Rate Sensitivity on NII and EVE [line items]
Increase (decrease) in rates before tax impact	$ (187)