Loans and Allowance for Credit Losses - Disclosure of Loans Past Due But Not Impaired (Detail) - CAD ($) $ in Millions	Oct. 31, 2022	Oct. 31, 2021
Disclosure of loans that are either past due or impaired [line items]
Loans past due but not impaired	$ 2,777	$ 2,472
Retail [member]
Disclosure of loans that are either past due or impaired [line items]
Loans past due but not impaired	1,496	1,242
Wholesale [member]
Disclosure of loans that are either past due or impaired [line items]
Loans past due but not impaired	1,281	1,230
30 to 89 days [member]
Disclosure of loans that are either past due or impaired [line items]
Loans past due but not impaired	2,607	2,335
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	1,328	1,105
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	1,279	1,230
90 Days and Greater [member]
Disclosure of loans that are either past due or impaired [line items]
Loans past due but not impaired	170	137
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	168	137
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	$ 2	$ 0