Loans and Allowance for Credit Losses - Disclosure of Loans Past Due But Not Impaired (Detail) - CAD ($) $ in Millions	Jul. 31, 2026	Oct. 31, 2025
Disclosure of loans that are either past due or impaired [line items]
Loans past due but not impaired	$ 4,004	$ 4,107
Retail [member]
Disclosure of loans that are either past due or impaired [line items]
Loans past due but not impaired	2,890	2,957
Wholesale [member]
Disclosure of loans that are either past due or impaired [line items]
Loans past due but not impaired	1,114	1,150
30 to 89 days [member]
Disclosure of loans that are either past due or impaired [line items]
Loans past due but not impaired	3,621	3,777
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	2,558	2,634
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	1,063	1,143
90 Days and Greater [member]
Disclosure of loans that are either past due or impaired [line items]
Loans past due but not impaired	383	330
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	332	323
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	$ 51	$ 7