Deposits - Summary of maturity schedule for deposits greater than one hundred thousand dollars booked in Canada (Detail) - CAD ($) $ in Millions	Jan. 31, 2025	Oct. 31, 2024
Disclosure of deposits payable to customers on a fixed date [line items]
Deposits (Note 4)	$ 996,832	$ 982,440
CANADA
Disclosure of deposits payable to customers on a fixed date [line items]
Deposits (Note 4)	619,339	618,141
CANADA | Deposits more than one hundred thousand dollar [Member]
Disclosure of deposits payable to customers on a fixed date [line items]
Deposits (Note 4)	277,246	285,555
CANADA | Less than 3 months [member] | Deposits more than one hundred thousand dollar [Member]
Disclosure of deposits payable to customers on a fixed date [line items]
Deposits (Note 4)	52,532	63,442
CANADA | 3 to 6 months [member] | Deposits more than one hundred thousand dollar [Member]
Disclosure of deposits payable to customers on a fixed date [line items]
Deposits (Note 4)	46,585	33,704
CANADA | 6 to 12 months [member] | Deposits more than one hundred thousand dollar [Member]
Disclosure of deposits payable to customers on a fixed date [line items]
Deposits (Note 4)	48,980	62,674
CANADA | Over 12 months [member] | Deposits more than one hundred thousand dollar [Member]
Disclosure of deposits payable to customers on a fixed date [line items]
Deposits (Note 4)	$ 129,149	$ 125,735