Securities - Additional Information (Detail) - CAD ($) $ in Millions	3 Months Ended	6 Months Ended
Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019	Oct. 31, 2019
Disclosure of detailed information about financial instruments [line items]
Dividend Income recognized	$ 28	$ 23	$ 58	$ 47
Allowance for credit losses on debt securities	6,925	3,778	6,925	3,778
Provision (recovery) of credit losses	(3,218)	(633)	(4,137)	(1,483)
Debt securities [member]
Disclosure of detailed information about financial instruments [line items]
Allowance for credit losses on debt securities	13		13		$ 4
Debt securities at amortized cost [member]
Disclosure of detailed information about financial instruments [line items]
Allowance for credit losses on debt securities	2		2		1
Provision (recovery) of credit losses	1	0	1	0
Debt securities FVOCI [member]
Disclosure of detailed information about financial instruments [line items]
Allowance for credit losses on debt securities	11		11		$ 3
Provision (recovery) of credit losses	8	2	8	2
Securities disposed [member] \| Securities [member]
Disclosure of detailed information about financial instruments [line items]
Disposal of equity securities	23	133	28	312
Gain (loss) on sale of equity securities measured at fair value	6	44	6	68
Dividend Income recognized	$ 0	$ 1	$ 0	$ 3

The amount of an allowance account used to record impairments to financial assets due to credit losses. [Refer: Financial assets]

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2021-01-01
-Name IFRS
-Number 7
-IssueDate 2019-01-01
-Paragraph 16
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2017-en-b&anchor=para_16&doctype=Standard&book=b
-URIDate 2019-03-27

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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 2019-01-01
-Paragraph 11B
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_11B_c&doctype=Standard
-URIDate 2019-03-27

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- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain 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 2019-01-01
-Paragraph 11A
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=7&code=ifrs-tx-2019-en-r&anchor=para_11A_d&doctype=Standard
-URIDate 2019-03-27

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- Definition

The increase (decrease) in the allowance account used to record the impairment of financial assets due to credit losses. [Refer: Financial assets; Allowance account for credit losses of financial assets]

+ References

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- Definition

Disposal of investments in equity instruments designated at fair value through other comprehensive income.

+ References

No definition available.

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