Amount of other expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses associated with a discontinued operation or an asset retirement obligation.

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Name:	us-gaap_OtherRestructuringCosts
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Restructuring and Other Charges - Narrative (Details) employee in Thousands, $ in Millions		3 Months Ended		6 Months Ended
	Sep. 30, 2019 USD ($) employee	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)
Restructuring Cost and Reserve [Line Items]
Other charges		$ 53	$ 6	$ 87	$ 8
Fiscal 2020 Plan
Restructuring Cost and Reserve [Line Items]
Estimated pre-tax charges	$ 1,000
Minimum \| Fiscal 2020 Plan
Restructuring Cost and Reserve [Line Items]
Expected positions to be eliminated \| employee	7
Maximum \| Fiscal 2020 Plan
Restructuring Cost and Reserve [Line Items]
Expected positions to be eliminated \| employee	9
Severance and EER \| Fiscal 2020 Plan
Restructuring Cost and Reserve [Line Items]
Estimated pre-tax charges	$ 900