IFRS 7 Disclosure - Market Risk - Summary of Market Risk Structural Interest Rate Sensitivities Measures (Detail) - CAD ($) $ in Millions	12 Months Ended
	Oct. 31, 2022	Oct. 31, 2021
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	$ (1,900)	$ (2,009)
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	781	929
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	1,709	1,537
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	(839)	$ (921)
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	(1,332)
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	547
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	1,269
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	(598)
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	(568)
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	234
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	440
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	$ (241)