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Balance Sheet Details - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019	Oct. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Contract liabilities		$ 6,000		$ 6,000	$ 6,000
Unearned revenue recognized			$ 2,100
Unsatisfied performance obligations	$ 6,000		6,000
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Current portion of capitalized costs	51		51		49
Non-current portion of capitalized costs	74		74		$ 74
Amortization of capitalized costs to obtain a contract	$ 14	$ 12	$ 28	$ 22
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-05-01
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Unsatisfied performance obligation expected to be recognized over the remainder of the year	34.00%		34.00%
Expected timing of satisfaction	6 months		6 months