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Employee Compensation - Share-Based Compensation - Summary of Further Information about our Stock Option Plan (Detail) - CAD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Oct. 31, 2025	Oct. 31, 2024
Disclosure of number and weighted average exercise price of share options [abstract]
Unrecognized compensation cost for non-vested stock option awards	$ 10	$ 12
Cash proceeds from stock options exercised	$ 146	$ 67
Weighted-average share price for stock options exercised (in dollars)	$ 152.59	$ 120.4

X

- Definition

The disclosure of number and weighted average exercise price of share options.

+ References

No definition available.

+ Details

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- Definition

Unrecognized compensation cost related to nonvested stock option awards.

+ References

No definition available.

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- Definition

Weighted average share price, share options exercised.

+ References

No definition available.

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- Definition

The cash inflow from the exercise of options.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 7
-IssueDate 2024-01-01
-Paragraph 17
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=7&code=ifrs-tx-2024-en-r&anchor=para_17&doctype=Standard
-URIDate 2024-03-27

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