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IFRS 7 - Disclosure - Credit Risk - Summary of Exposure to Credit Risk (Detail) - CAD ($) $ in Millions	Apr. 30, 2025	Oct. 31, 2024
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	$ 1,060,572	$ 1,022,941
Business and government portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	544,304	522,546
Business and government portfolios [member] | Drawn [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	418,601	402,653
Business and government portfolios [member] | Undrawn commitments [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	64,448	63,961
Business and government portfolios [member] | Repo style transactions [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	475,812	408,202
Business and government portfolios [member] | Other off balance sheet items [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	18,578	17,565
Business and government portfolios [member] | OTC derivatives [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	20,816	18,932
Retail portfolios [member] | Drawn [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	341,703	338,797
Retail portfolios [member] | Undrawn commitments [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	114,383	108,888
Retail portfolios [member] | Other off balance sheet items [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	605	558
Securitization exposures [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	59,577	52,152
Repo style transaction collateral [member] | Business and government portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	453,951	388,767
Gross carrying amount [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	1,514,523	1,411,708
Gross carrying amount [member] | Business and government portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	998,255	911,313
Gross carrying amount [member] | Retail portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	456,691	448,243
Internal Ratings Based [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	1,006,823	973,004
Internal Ratings Based [member] | Business and government portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	525,799	504,932
Internal Ratings Based [member] | Business and government portfolios [member] | Drawn [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	401,816	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	63,389	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	475,812	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	18,042	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	20,691	18,806
Internal Ratings Based [member] | Retail portfolios [member] | Drawn [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	334,724	331,821
Internal Ratings Based [member] | Retail portfolios [member] | Undrawn commitments [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	110,255	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	481	444
Internal Ratings Based [member] | Securitization exposures [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	35,564	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	453,951	388,767
Internal Ratings Based [member] | Gross carrying amount [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	1,460,774	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	979,750	893,699
Internal Ratings Based [member] | Gross carrying amount [member] | Retail portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	445,460	437,171
Standardized approach risk [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	53,749	49,937
Standardized approach risk [member] | Business and government portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	18,505	17,614
Standardized approach risk [member] | Business and government portfolios [member] | Drawn [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	16,785	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	1,059	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
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	536	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	6,979	6,976
Standardized approach risk [member] | Retail portfolios [member] | Undrawn commitments [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	4,128	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	124	114
Standardized approach risk [member] | Securitization exposures [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	24,013	21,251
Standardized approach risk [member] | Gross carrying amount [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	53,749	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	18,505	17,614
Standardized approach risk [member] | Gross carrying amount [member] | Retail portfolios [member]
Disclosure of credit risk exposure [line items]
Exposure to Credit Risk	$ 11,231	$ 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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