Loans, Impaired Loans and Allowance for Credit Losses - Loans Past Due But Not Impaired (Detail) - CAD ($) $ in Millions		Apr. 30, 2022	Jan. 31, 2022	Oct. 31, 2021
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross		$ 694,996	$ 672,830	$ 642,612
Residential mortgages [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross		337,714		319,678
Loans to consumers [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross		94,437		91,540
Credit Card [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross		13,622		12,450
Business and government [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross		249,223		218,944
Financial assets past due but not impaired [member]
Disclosure of detailed information about financial instruments [line items]
Loans and receivables gross	[1]	2,368	2,326	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]	1,157	1,177	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]	605	650	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]	408	398	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]	198	101	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]	1,428	1,416	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]	797	791	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]	387	424	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]	133	130	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]	111	71	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	726	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]	360	386	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]	218	226	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]	91	84	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]	87	30	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]	184	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]	$ 184	$ 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.