Borrowings - Schedule of Notes Payable and Short-Term Borrowings (Details) - USD ($) $ in Millions	Oct. 31, 2020	Oct. 31, 2019
Amount Outstanding
Current portion of long-term debt	$ 633	$ 307
Notes payable and short-term borrowings	$ 674	$ 357
Weighted-Average Interest Rate
Weighted-Average Interest Rate	4.00%	3.60%
Notes payable to banks, lines of credit and other
Amount Outstanding
Notes payable and short-term borrowings	$ 41	$ 50
Weighted-Average Interest Rate
Weighted-Average Interest Rate	1.60%	2.00%

Debt Instrument, Interest Rate, Weighted Average Interest Rate [Abstract]

No definition available.

Name:	hpq_DebtInstrumentInterestRateWeightedAverageInterestRateAbstract
Namespace Prefix:	hpq_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_DebtCurrentAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of long-term debt and lease obligation, classified as current.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LongTermDebtAndCapitalLeaseObligationsCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_ShortTermDebtTypeAxis=hpq_NotesPayableToBanksLinesOfCreditAndOtherNotesPayablesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: