Guarantees, Indemnifications and Warranties - Narrative (Details) - USD ($) $ in Millions	Jul. 31, 2017	Oct. 31, 2016
Other Commitments [Line Items]
Receivable	$ 1,300
HP, Inc. | Cross-Indemnifications
Other Commitments [Line Items]
Receivable	54	$ 56
Payable	42	$ 41
Majority-Owned Subsidiary, Unconsolidated
Other Commitments [Line Items]
Receivable	128
Payable	19
Tax Indemnification | Majority-Owned Subsidiary, Unconsolidated
Other Commitments [Line Items]
Receivable	$ 130