Loans, Impaired Loans and Allowance for Credit Losses - Loans Past Due But Not Impaired (Detail) - CAD ($) $ in Millions		Jul. 31, 2022	Apr. 30, 2022	Oct. 31, 2021
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross		$ 718,525	$ 694,996	$ 642,612
Residential mortgages [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross		343,965		319,678
Loans to consumers [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross		96,561		91,540
Credit Card [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross		13,871		12,450
Business and government [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross		264,128		218,944
Financial assets past due but not impaired [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross	[1]	2,585	2,368	2,237
Financial assets past due but not impaired [member] | Residential mortgages [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross	[1]	1,296	1,157	1,059
Financial assets past due but not impaired [member] | Loans to consumers [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross	[1]	656	605	621
Financial assets past due but not impaired [member] | Credit Card [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross	[1]	480	408	409
Financial assets past due but not impaired [member] | Business and government [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross	[1]	153	198	148
31 - 60 days [member] | Financial assets past due but not impaired [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross	[1]	1,622	1,428	1,392
31 - 60 days [member] | Financial assets past due but not impaired [member] | Residential mortgages [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross	[1]	890	797	732
31 - 60 days [member] | Financial assets past due but not impaired [member] | Loans to consumers [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross	[1]	435	387	411
31 - 60 days [member] | Financial assets past due but not impaired [member] | Credit Card [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross	[1]	166	133	125
31 - 60 days [member] | Financial assets past due but not impaired [member] | Business and government [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross	[1]	131	111	124
61 - 90 days [member] | Financial assets past due but not impaired [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross	[1]	756	756	644
61 - 90 days [member] | Financial assets past due but not impaired [member] | Residential mortgages [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross	[1]	406	360	327
61 - 90 days [member] | Financial assets past due but not impaired [member] | Loans to consumers [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross	[1]	221	218	210
61 - 90 days [member] | Financial assets past due but not impaired [member] | Credit Card [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross	[1]	107	91	83
61 - 90 days [member] | Financial assets past due but not impaired [member] | Business and government [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross	[1]	22	87	24
91 days and greater [member] | Financial assets past due but not impaired [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross	[1],[2]	207	184	201
91 days and greater [member] | Financial assets past due but not impaired [member] | Credit Card [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross	[1],[2]	$ 207	$ 184	$ 201

[1] For loans where payment deferrals were granted, deferred payments are not considered past due and such loans are not aged further during the deferral period. Regular ageing of the loans resumes, after the end of the deferral period.

[2] All loans that are over 90 days past due are considered impaired with the exception of credit card receivables which are considered impaired when 180 days past due.