Fair Value Measurements and Derivatives - Additional Information (Detail) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Fair Value, Measurement Inputs, Disclosure [Line Items]
Notional amounts of derivatives	$ 230	$ 108
Notional amounts of currency forward contracts designated cash flow hedges	210
Deferred losses which are reported in AOCI that are expected to be reclassified to earnings during the next twelve months	14
Fair value of the note lower than the callable value	2
Cross Currency Swap
Fair Value, Measurement Inputs, Disclosure [Line Items]
Notional amounts of derivatives	$ 3	$ 3

The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 45

-Subparagraph b(2)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6887037&loc=d3e80748-113994

Name:	us-gaap_ForeignCurrencyCashFlowHedgeGainLossToBeReclassifiedDuringNext12Months
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant