Venezuela - Additional Information (Detail) In Millions, unless otherwise specified	3 Months Ended
Dec. 31, 2013 USD ($)	Dec. 31, 2013 VEF	Dec. 31, 2012 USD ($)	Dec. 31, 2012 VEF	Dec. 31, 2013 Operating Affiliate, Venezuela [Member]
Nature Of Operations [Line Items]
Equity method investment, ownership percentage					49.00%
Operating affiliate investment	$ 23
Due from affiliates, dividends cash	3	20
Cash dividends received from subsidiary	$ 2	11	$ 1	4

Amount of Equity in net profit and loss for the period. Give totals for each group. If operations of any controlled companies are different in character from those of the company, group such affiliates (1) within divisions and (2) by type of activities.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 320

-Section S99

-Paragraph 6

-Subparagraph (SX 210.12-14)

-URI http://asc.fasb.org/extlink&oid=6955306&loc=d3e611322-123010

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 14

-Paragraph 2,6

-Article 12

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 14

-Paragraph Column C

-Article 12

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