Inventory (Details) (USD $) In Millions	Jul. 31, 2011	Oct. 31, 2010
Inventory [Abstract]
Finished goods	$ 441	$ 338
Purchased parts and fabricated assemblies	456	378
Inventory	$ 897	$ 716

Carrying amount as of the balance sheet date of merchandise or goods held by the company that are readily available for sale.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 6
-Subparagraph a
-Article 5

Name:	us-gaap_InventoryFinishedGoods
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant