Investment Securities - Additional Information (Detail) - CAD ($) $ in Millions	3 Months Ended	6 Months Ended
Apr. 30, 2022	Jan. 31, 2022	Apr. 30, 2021	Apr. 30, 2022	Apr. 30, 2021
Disclosure of detailed information about financial instruments [line items]
Fair value of disposed equity securities	$ 196	$ 381	$ 523	$ 577	$ 704
Cumulative after-tax gain on equity securities designated at FVOCI	43	36	72	79	111
Dividend income	$ 42	$ 38	$ 26	$ 80	$ 52

Fair value of investments in equity instruments designated at fair value through other comprehensive income disposed during the period.

No definition available.

+ Details

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- Definition

The cumulative gain (loss) on disposal of investments in equity instruments that the entity has designated at fair value through other comprehensive income. [Refer: At fair value [member]; Other comprehensive income]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 11B
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_11B_c&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 amount of dividends related to investments in equity instruments that the entity has designated at fair value through other comprehensive income, held at the end of the reporting period. [Refer: Investments in equity instruments designated at fair value through other comprehensive income [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 7
-IssueDate 2021-01-01
-Paragraph 11A
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2021-en-r&anchor=para_11A_d&doctype=Standard
-URIDate 2021-03-24

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