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IFRS 7 - Disclosure - Credit Risk - Summary of Exposure to Credit Risk (Detail) - CAD ($) $ in Millions	Jan. 31, 2025	Oct. 31, 2024
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	$ 1,057,191	$ 1,022,941
Business and government portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	546,740	522,546
Business and government portfolios [member] | Drawn [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	417,491	402,653
Business and government portfolios [member] | Undrawn commitments [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	63,505	63,961
Business and government portfolios [member] | Repo style transactions [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	481,463	408,202
Business and government portfolios [member] | Other off balance sheet items [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	18,618	17,565
Business and government portfolios [member] | OTC derivatives [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	20,864	18,932
Retail portfolios [member] | Drawn [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	340,186	338,797
Retail portfolios [member] | Undrawn commitments [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	112,299	108,888
Retail portfolios [member] | Other off balance sheet items [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	564	558
Securitization exposures [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	57,402	52,152
Repo style transaction collateral [member] | Business and government portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	455,201	388,767
Gross carrying amount [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	1,512,392	1,411,708
Gross carrying amount [member] | Business and government portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	1,001,941	911,313
Gross carrying amount [member] | Retail portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	453,049	448,243
Internal Ratings Based [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	1,005,745	973,004
Internal Ratings Based [member] | Business and government portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	528,113	504,932
Internal Ratings Based [member] | Business and government portfolios [member] | Drawn [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	400,683	386,836
Internal Ratings Based [member] | Business and government portfolios [member] | Undrawn commitments [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	62,377	62,778
Internal Ratings Based [member] | Business and government portfolios [member] | Repo style transactions [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	481,462	408,201
Internal Ratings Based [member] | Business and government portfolios [member] | Other off balance sheet items [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	18,065	17,078
Internal Ratings Based [member] | Business and government portfolios [member] | OTC derivatives [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	20,727	18,806
Internal Ratings Based [member] | Retail portfolios [member] | Drawn [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	333,097	331,821
Internal Ratings Based [member] | Retail portfolios [member] | Undrawn commitments [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	108,161	104,906
Internal Ratings Based [member] | Retail portfolios [member] | Other off balance sheet items [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	447	444
Internal Ratings Based [member] | Securitization exposures [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	35,927	30,901
Internal Ratings Based [member] | Repo style transaction collateral [member] | Business and government portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	455,201	388,767
Internal Ratings Based [member] | Gross carrying amount [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	1,460,946	1,361,771
Internal Ratings Based [member] | Gross carrying amount [member] | Business and government portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	983,314	893,699
Internal Ratings Based [member] | Gross carrying amount [member] | Retail portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	441,705	437,171
Standardized approach risk [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	51,446	49,937
Standardized approach risk [member] | Business and government portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	18,627	17,614
Standardized approach risk [member] | Business and government portfolios [member] | Drawn [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	16,808	15,817
Standardized approach risk [member] | Business and government portfolios [member] | Undrawn commitments [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	1,128	1,183
Standardized approach risk [member] | Business and government portfolios [member] | Repo style transactions [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	1	1
Standardized approach risk [member] | Business and government portfolios [member] | Other off balance sheet items [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	553	487
Standardized approach risk [member] | Business and government portfolios [member] | OTC derivatives [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	137	126
Standardized approach risk [member] | Retail portfolios [member] | Drawn [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	7,089	6,976
Standardized approach risk [member] | Retail portfolios [member] | Undrawn commitments [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	4,138	3,982
Standardized approach risk [member] | Retail portfolios [member] | Other off balance sheet items [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	117	114
Standardized approach risk [member] | Securitization exposures [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	21,475	21,251
Standardized approach risk [member] | Repo style transaction collateral [member] | Business and government portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	0	0
Standardized approach risk [member] | Gross carrying amount [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	51,446	49,937
Standardized approach risk [member] | Gross carrying amount [member] | Business and government portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	18,627	17,614
Standardized approach risk [member] | Gross carrying amount [member] | Retail portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	$ 11,344	$ 11,072

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The amount that best represents the maximum exposure to credit risk without taking into account any collateral held or other credit enhancements (for example, netting agreements that do not qualify for offset in accordance with IAS 32). [Refer: Credit risk [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2024-01-01
-Paragraph 35K
-Subparagraph a
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2024-en-r&anchor=para_35K_a&doctype=Standard
-URIDate 2024-03-27

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