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Balance Sheet Details - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2020	Jan. 31, 2019	Oct. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Contract liabilities	$ 6,000		$ 6,000
Unearned revenue recognized	1,300
Unsatisfied performance obligations	6,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Current portion of capitalized costs	51
Non-current portion of capitalized costs	77
Amortization of capitalized costs to obtain a contract	$ 14	$ 10
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-02-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligation expected to be recognized over the remainder of the year	42.00%
Expected timing of satisfaction	9 months

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Amount of amortization expense for asset recognized from cost incurred to obtain or fulfill contract with customer.

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