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IFRS 7 - Disclosure - Credit Risk - Summary of Exposure to Credit Risk (Detail) - CAD ($) $ in Millions	Jul. 31, 2025	Oct. 31, 2024
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	$ 1,087,735	$ 1,022,941
Business and government portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	561,338	522,546
Business and government portfolios [member] | Drawn [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	428,336	402,653
Business and government portfolios [member] | Undrawn commitments [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	66,743	63,961
Business and government portfolios [member] | Repo style transactions [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	506,659	408,202
Business and government portfolios [member] | Other off balance sheet items [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	19,480	17,565
Business and government portfolios [member] | OTC derivatives [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	21,225	18,932
Retail portfolios [member] | Drawn [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	342,734	338,797
Retail portfolios [member] | Undrawn commitments [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	115,630	108,888
Retail portfolios [member] | Other off balance sheet items [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	594	558
Securitization exposures [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	67,439	52,152
Repo style transaction collateral [member] | Business and government portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	481,105	388,767
Gross carrying amount [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	1,568,840	1,411,708
Gross carrying amount [member] | Business and government portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	1,042,443	911,313
Gross carrying amount [member] | Retail portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	458,958	448,243
Internal Ratings Based [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	1,029,860	973,004
Internal Ratings Based [member] | Business and government portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	543,112	504,932
Internal Ratings Based [member] | Business and government portfolios [member] | Drawn [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	411,940	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	65,529	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	506,658	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	18,990	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	21,100	18,806
Internal Ratings Based [member] | Retail portfolios [member] | Drawn [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	336,177	331,821
Internal Ratings Based [member] | Retail portfolios [member] | Undrawn commitments [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	111,446	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	471	444
Internal Ratings Based [member] | Securitization exposures [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	38,654	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	481,105	388,767
Internal Ratings Based [member] | Gross carrying amount [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	1,510,965	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	1,024,217	893,699
Internal Ratings Based [member] | Gross carrying amount [member] | Retail portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	448,094	437,171
Standardized approach risk [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	57,875	49,937
Standardized approach risk [member] | Business and government portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	18,226	17,614
Standardized approach risk [member] | Business and government portfolios [member] | Drawn [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	16,396	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	1,214	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	490	487
Standardized approach risk [member] | Business and government portfolios [member] | OTC derivatives [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	125	126
Standardized approach risk [member] | Retail portfolios [member] | Drawn [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	6,557	6,976
Standardized approach risk [member] | Retail portfolios [member] | Undrawn commitments [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	4,184	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	123	114
Standardized approach risk [member] | Securitization exposures [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	28,785	21,251
Standardized approach risk [member] | Gross carrying amount [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	57,875	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	18,226	17,614
Standardized approach risk [member] | Gross carrying amount [member] | Retail portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	$ 10,864	$ 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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