Acquisitions, Goodwill and Intangible Assets (Details 2) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
Apr. 30, 2015	Oct. 31, 2014
Intangible assets
Amortizable intangible assets, gross	$ 11,223	$ 11,248
Amortizable intangible assets, accumulated amortization	(5,164)	(4,790)
Intangible Assets, Accumulated Impairment Losses	(4,330)	(4,330)
Amortizable intangible assets, net	1,729us-gaap_FiniteLivedIntangibleAssetsNet
Total Intangible Assets- Net	1,729	2,128
Amount of fully amortized intangible assets	65
Customer contracts, customer lists and distribution agreements
Intangible assets
Amortizable intangible assets, gross	5,269	5,289
Amortizable intangible assets, accumulated amortization	(3,459)	(3,228)
Intangible Assets, Accumulated Impairment Losses	(856)	(856)
Amortizable intangible assets, net	954	1,205
Developed and core technology and patents
Intangible assets
Amortizable intangible assets, gross	4,264	4,266
Amortizable intangible assets, accumulated amortization	(1,409)	(1,301)
Intangible Assets, Accumulated Impairment Losses	(2,138)	(2,138)
Amortizable intangible assets, net	717	827
Trade name and trade marks
Intangible assets
Amortizable intangible assets, gross	1,690	1,693
Amortizable intangible assets, accumulated amortization	(296)	(261)
Intangible Assets, Accumulated Impairment Losses	(1,336)	(1,336)
Amortizable intangible assets, net	$ 58	$ 96

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

Represents the amount of fully amortized intangible assets which have been eliminated from both the gross and accumulated amortization amounts.

+ References

No definition available.

+ Details

Name:	hpq_FiniteLivedIntangibleAssetsFullyAmortized
Namespace Prefix:	hpq_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Accumulated impairment loss resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value.

+ References

No definition available.

+ Details

Name:	hpq_IntangibleAssetsAccumulatedImpairmentLosses
Namespace Prefix:	hpq_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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

- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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

- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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

- Definition

Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16212-109274

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph ((a)(1),(b))

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

+ Details

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

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=hpq_CustomerContractsCustomerListsAndDistributionAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=hpq_DevelopedTechnologyRightsPatentedAndUnpatentedTechnologyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_TrademarksAndTradeNamesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: