Overview and Summary of Significant Accounting Policies - Concentrations of Risk (Details) - USD ($) $ in Millions	12 Months Ended
Oct. 31, 2018	Oct. 31, 2017
Hewlett Packard Enterprise
Concentration Risk
Net income tax indemnification receivables	$ 1,000	$ 1,700
Accounts Receivable \| Major Customers \| Ten largest distributor
Concentration Risk
Concentration of credit risk (as a percent)	39.00%	34.00%
Accounts Receivable \| Major Customers \| Three largest outsourced manufacturer
Concentration Risk
Concentration of credit risk (as a percent)	72.00%	70.00%
Supplier receivables	$ 1,074	$ 951

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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