Contingent Liabilities - Additional Information (Detail) - Litigation [member] - CAD ($)	Oct. 31, 2019	Jan. 31, 2019
Bottom of range [member]
Disclosure of contingent liabilities [line items]
Bank's reasonable possible losses	$ 0	$ 0
Top of range [member]
Disclosure of contingent liabilities [line items]
Bank's reasonable possible losses	$ 606,000,000	$ 544,000,000

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

No definition available.

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