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REVENUE - Contract Balances (Details) - USD ($) $ in Millions		3 Months Ended
	Nov. 01, 2018	Apr. 30, 2019	Oct. 31, 2018
Contract Assets
Contract Assets (Unbilled Accounts Receivable)	$ 57	$ 86
Transaction Price Allocated to Remaining Performance Obligation
Remaining Performance Obligation, Amount		174
Majority of Remaining Performance Obligation Expected Timing of Satisfaction, Period			12 months
Contract Liabilities
Contract liability ending balance as of October 31, 2018	367
Net revenue deferred in the period		224
Revenue recognized that was included in the contract liability balance at the beginning of the period		(191)
Change in deferrals from customer cash advances, net of revenue recognized		2
Contract liabilities acquired in business combinations		2
Currency Translation Adjustment		1
Contract liability ending balance as of January 31, 2019		394
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]
Contract Assets
Contract Assets (Unbilled Accounts Receivable)		$ 29
Contract Liabilities
Impact of adoption of new guidance on contract liabilities (deferred revenue)	$ (11)