Loans and Allowance for Credit Losses - Disclosure of Loans Past Due But Not Impaired (Detail) - CAD ($) $ in Millions	Oct. 31, 2024	Oct. 31, 2023
Disclosure of loans that are either past due or impaired [line items]
Loans past due but not impaired	$ 4,263	$ 3,920
Retail [member]
Disclosure of loans that are either past due or impaired [line items]
Loans past due but not impaired	2,805	2,048
Wholesale [member]
Disclosure of loans that are either past due or impaired [line items]
Loans past due but not impaired	1,458	1,872
30 to 89 days [member]
Disclosure of loans that are either past due or impaired [line items]
Loans past due but not impaired	3,996	3,663
30 to 89 days [member] \| Retail [member]
Disclosure of loans that are either past due or impaired [line items]
Loans past due but not impaired	2,542	1,840
30 to 89 days [member] \| Wholesale [member]
Disclosure of loans that are either past due or impaired [line items]
Loans past due but not impaired	1,454	1,823
90 Days and Greater [member]
Disclosure of loans that are either past due or impaired [line items]
Loans past due but not impaired	267	257
90 Days and Greater [member] \| Retail [member]
Disclosure of loans that are either past due or impaired [line items]
Loans past due but not impaired	263	208
90 Days and Greater [member] \| Wholesale [member]
Disclosure of loans that are either past due or impaired [line items]
Loans past due but not impaired	$ 4	$ 49