Derivative financial instruments and hedging activities - Summary of Cash flow and Net Investment Hedges - Assets and Liabilities Designated as Hedged Items (Detail) - CAD ($) $ in Millions	12 Months Ended
Oct. 31, 2022	Oct. 31, 2021
Cash flow hedges [member] \| Interest rate risk [member] \| Variable rate assets [member]
Disclosure of detailed information about hedged items [line items]
Balance sheet items	Securities – Investment, net ofapplicable allowance; Loans – Retail;	Securities – Investment, net of applicable allowance; Loans – Retail
Changes in fair values used for calculating hedge ineffectiveness	$ 4,720	$ 614
Cash flow hedge /foreign currency translation reserve, Continuing hedges	(1,777)	(402)
Cash flow hedge /foreign currency translation reserve, Discontinued hedges	$ (2,668)	$ 206
Cash flow hedges [member] \| Interest rate risk [member] \| Variable rate liabilities [member]
Disclosure of detailed information about hedged items [line items]
Balance sheet items	Deposits – Business and government;Deposits – Personal;	Deposits – Business and government; Deposits – Personal
Changes in fair values used for calculating hedge ineffectiveness	$ (6,895)	$ (2,641)
Cash flow hedge /foreign currency translation reserve, Continuing hedges	5,471	1,310
Cash flow hedge /foreign currency translation reserve, Discontinued hedges	$ 2,231	$ (399)
Cash flow hedges [member] \| Foreign exchange risk [member] \| Fixed rate assets [member]
Disclosure of detailed information about hedged items [line items]
Balance sheet items	Securities – Investment, net of applicable allowance	Securities – Investment, net of applicable allowance; Loans – Retail
Changes in fair values used for calculating hedge ineffectiveness	$ (17)	$ (98)
Cash flow hedge /foreign currency translation reserve, Continuing hedges	7	1
Net investment hedges [member] \| Foreign exchange risk [member] \| Foreign subsidiary [member]
Disclosure of detailed information about hedged items [line items]
Changes in fair values used for calculating hedge ineffectiveness	1,927	(2,331)
Cash flow hedge /foreign currency translation reserve, Continuing hedges	(5,936)	(4,032)
Cash flow hedge /foreign currency translation reserve, Discontinued hedges	$ (421)	$ (421)

The description of the line item in the statement of financial position that includes the hedged item. [Refer: Hedged items [member]]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 24B
-Subparagraph a
-Clause iii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24B_a_iii&doctype=Standard
-URIDate 2021-03-24

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

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- Definition

The gain (loss) on the change in fair value of the hedged item used as a basis for recognising hedge ineffectiveness. Hedge ineffectiveness is the extent to which the changes in the fair value or the cash flows of the hedging instrument are greater or less than those on the hedged item.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 24B
-Subparagraph a
-Clause iv
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24B_a_iv&doctype=Standard
-URIDate 2021-03-24

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 24B
-Subparagraph b
-Clause i
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_24B_b_i&doctype=Standard
-URIDate 2021-03-24

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- Definition

A component of equity representing the reserve of cash flow hedges or the reserve of exchange differences on translation in relation to continuing hedges.

+ References

No definition available.

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- Definition

A component of equity representing the reserve of cash flow hedges or the reserve of exchange differences on translation in relation to hedging relationships for which hedge accounting is no longer applied.

+ References

No definition available.

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