Supplementary Financial Information - Costs of Obtaining Contracts (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2022	Oct. 31, 2021	Oct. 31, 2020
Capitalized Contract Cost [Line Items]
Contract cost amortization	$ 129	$ 79
Contract liability	2,500	2,300	$ 2,200
Revenue recognized	1,100	1,100
Deferred contract fulfillment
Capitalized Contract Cost [Line Items]
Capitalized contract costs	34	65
Acquisition costs
Capitalized Contract Cost [Line Items]
Capitalized contract costs	$ 34	$ 36