Summary of Allowance for Doubtful Accounts (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Oct. 31, 2012	Oct. 31, 2011	Oct. 31, 2010
Financing Receivable, Allowance for Credit Losses [Line Items]
Loss on Contract Termination for Default	$ 6	$ 20	$ 22

The amount of the loss on termination of a contract for default.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 912

-SubTopic 20

-Section 45

-Paragraph 5

-URI http://asc.fasb.org/extlink&oid=6539154&loc=d3e52595-109384

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