Guarantees, Indemnifications and Warranties - Litigation Matters and Other Contingencies (Details) - USD ($) $ in Millions	Oct. 31, 2018	Oct. 31, 2017
Tax Indemnification
Other Commitments [Line Items]
Indemnification receivable - long-term	$ 16	$ 1,430
Indemnification receivable - short-term	17	0
Indemnification payable - long-term	9	0
Indemnification payable - short-term	26	36
Cross-Indemnifications
Other Commitments [Line Items]
Receivable	104	150
Payable	$ 83	91
HP Inc. | Tax Indemnification
Other Commitments [Line Items]
Indemnification receivable - long-term		$ 1,300