Retirement and Post-Retirement Benefit Plans (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
Oct. 31, 2013	Oct. 31, 2012	Oct. 31, 2011
Defined Contribution Plan Disclosures
Total defined contribution expense	$ 603	$ 628	$ 626
HP 401(k) Plan
Defined Contribution Plan Disclosures
Percent of equal 401(k) match to employees effective during the period	100.00%
Percentage of maximum matching contribution	4.00%

The amount of the cost recognized during the period for defined contribution plans.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 70

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration