Debt Instrument, Change In Fair Value Of Hedged Debt

No definition available.

Name:	hpq_DebtInstrumentChangeInFairValueOfHedgedDebt
Namespace Prefix:	hpq_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Debt Instrument, Redeemed Amount

+ References

No definition available.

+ Details

Name:	hpq_DebtInstrumentRedeemedAmount
Namespace Prefix:	hpq_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Number of Credit of Facility Programs

+ References

No definition available.

+ Details

Name:	hpq_NumberofCreditofFacilityPrograms
Namespace Prefix:	hpq_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

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

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Face (par) amount of the original debt instrument that was repurchased.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentRepurchasedFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount, after accumulated amortization, of debt discount.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 1A
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28541-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentUnamortizedDiscount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ 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 210.5-02.17)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399

+ Details

Name:	us-gaap_DeferredFinanceCostsNet
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Nominal or face amount used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=121590274&loc=SL5579245-113959

+ Details

Name:	us-gaap_DerivativeNotionalAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant

- Definition

Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12355-112629

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 50
-Section 40
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=117329964&loc=d3e12317-112629

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585

+ Details

Name:	us-gaap_GainsLossesOnExtinguishmentOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

+ Details

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

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

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

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_TreasuryLockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentsGainLossByHedgingRelationshipAxis=us-gaap_CashFlowHedgingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DerivativeInstrumentRiskAxis=us-gaap_InterestRateSwapMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hpq_ShelfRegistration2019Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hpq_ShelfRegistration2019DueJune2025Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hpq_ShelfRegistration2019DueJune2027Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hpq_ShelfRegistration2019DueJune2030Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hpq_ShelfRegistration2009DueDecember2020June2021September2021AndDecember2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hpq_ShelfRegistration2009DueDecember12020AndJune12021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hpq_ShelfRegistration2009CorporateDebtSecuritiesDueDecember2020Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hpq_ShelfRegistration2009CorporateDebtSecuritiesIssuedAtDiscountToParDueJune2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hpq_ShelfRegistration2009CorporateDebtSecuritiesIssuedAtDiscountToParDueSeptember2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=hpq_ShelfRegistration2009CorporateDebtSecuritiesIssuedAtDiscountToParDueDecember2021Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_CommercialPaperMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_RevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Borrowings - Narrative (Details)			1 Months Ended	12 Months Ended
Borrowings - Narrative (Details)	Jul. 22, 2020 USD ($)	May 29, 2020 USD ($)	Jun. 30, 2020 USD ($)	Oct. 31, 2020 USD ($) commercial_paper_program	Oct. 31, 2019 USD ($)	Oct. 31, 2018 USD ($)	Mar. 31, 2020 USD ($)
Debt Instrument [Line Items]
Issuance costs			$ 26,000,000	$ 37,000,000	$ 16,000,000
Notional amount				21,997,000,000	23,669,000,000
Discounts on debt issuance				9,000,000
Fair value adjustment related to hedged debt				2,000,000	4,000,000
Loss on extinguishment of debt				$ 40,000,000	$ 0	$ 126,000,000
Number of commercial paper programs \| commercial_paper_program				2
Treasury Lock \| Cash flow hedges
Debt Instrument [Line Items]
Notional amount				$ 750,000,000			$ 750,000,000
Interest Rate Swap
Debt Instrument [Line Items]
Notional amount			500,000,000	500,000,000
Shelf Registration 2019
Debt Instrument [Line Items]
Face amount of debt instrument			3,000,000,000.0
$1,150 issued at discount to par at a price of 99.769% in June 2020 at 2.2%, due June 2025
Debt Instrument [Line Items]
Face amount of debt instrument			$ 1,150,000,000	$ 1,150,000,000
Interest rate (percent)			2.20%	2.20%
$1,000 issued at discount to par at a price of 99.718% in June 2020 at 3.0%, due June 2027
Debt Instrument [Line Items]
Face amount of debt instrument			$ 1,000,000,000.0	$ 1,000,000,000
Interest rate (percent)			3.00%	3.00%
$850 issued at discount to par at a price of 99.790% in June 2020 at 3.4%, due June 2030
Debt Instrument [Line Items]
Face amount of debt instrument			$ 850,000,000	$ 850,000,000
Interest rate (percent)			3.40%	3.40%
Shelf Registration 2009, Due December 2020, June 2021, September 2021, And December 2021
Debt Instrument [Line Items]
Repurchased amount			$ 700,000,000
Loss on extinguishment of debt			23,000,000
Shelf Registration 2009, Due December 1, 2020 and June 1, 2021
Debt Instrument [Line Items]
Redeemed amount			$ 900,000,000
Loss on extinguishment of debt	$ 17,000,000
$1,350 issued at discount to par at a price of 99.827% in December 2010 at 3.75%, due December 2020
Debt Instrument [Line Items]
Face amount of debt instrument				$ 1,350,000,000
Interest rate (percent)	3.75%		3.75%	3.75%
Redeemed amount	$ 500,000,000
$1,250 issued at discount to par at a price of 99.799% in May 2011 at 4.3%, due June 2021
Debt Instrument [Line Items]
Face amount of debt instrument				$ 1,250,000,000
Interest rate (percent)	4.30%		4.30%	4.30%
Redeemed amount	$ 400,000,000
$1,000 issued at discount to par at a price of 99.816% in September 2011 at 4.375%, due September 2021
Debt Instrument [Line Items]
Face amount of debt instrument				$ 1,000,000,000
Interest rate (percent)			4.375%	4.375%
$1,500 issued at discount to par at a price of 99.707% in December 2011 at 4.65%, due December 2021
Debt Instrument [Line Items]
Face amount of debt instrument				$ 1,500,000,000
Interest rate (percent)			4.65%	4.65%
Commercial paper
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 6,000,000,000.0
Credit Facility
Debt Instrument [Line Items]
Maximum borrowing capacity		$ 1,000,000,000.0		4,000,000,000.0
Revolving credit facility, term		364 days
Lines of credit
Debt Instrument [Line Items]
Uncommitted lines of credit				$ 725,000,000