REVENUE - Contract Assets and Liability (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2021	Jan. 31, 2020	Oct. 31, 2020
Contract Asset
Contract Assets (Unbilled Accounts Receivable)	$ 154		$ 153
Contract Liability
Contract liability ending balance as of October 31, 2019	446
Net revenue deferred in the period	197
Revenue recognized that was included in the contract liability balance at the beginning of the period	(186)	$ 142
Change in deferrals from customer cash advances, net of revenue recognized	20
Currency Translation and Other Adjustment	8
Contract liability ending balance as of April 30, 2020	$ 485