Restructuring and Other Charges - Narrative (Details) $ in Millions			12 Months Ended
	Nov. 18, 2022 USD ($) employee	Sep. 30, 2019 USD ($) employee	Oct. 31, 2022 USD ($)	Oct. 31, 2021 USD ($)	Oct. 31, 2020 USD ($)
Restructuring Cost and Reserve [Line Items]
Other charges			$ 25	$ 22	$ 105
Fiscal 2020 Plan
Restructuring Cost and Reserve [Line Items]
Expected number of positions to be eliminated | employee		7,700
Fiscal 2023 Plan | Minimum | Subsequent event
Restructuring Cost and Reserve [Line Items]
Expected number of positions to be eliminated | employee	4,000
Fiscal 2023 Plan | Maximum | Subsequent event
Restructuring Cost and Reserve [Line Items]
Expected number of positions to be eliminated | employee	6,000
Labor And Non-Labor Actions | Fiscal 2023 Plan | Subsequent event
Restructuring Cost and Reserve [Line Items]
Estimated pre-tax charges	$ 1,000
Labor Costs | Fiscal 2023 Plan | Subsequent event
Restructuring Cost and Reserve [Line Items]
Estimated pre-tax charges	$ 700
Severance Cost | Fiscal 2020 Plan
Restructuring Cost and Reserve [Line Items]
Estimated pre-tax charges		$ 740
Infrastructure Costs | Fiscal 2020 Plan
Restructuring Cost and Reserve [Line Items]
Estimated pre-tax charges		$ 281