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Accounting Policies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cumulative probability threshold for realization of income tax benefits	50.00%
Minimum recognizable tax benefit	50.00%
Sustainability threshold for uncertain tax position	50.00%
Advertising expenses	$ 12	$ 12	$ 11
Minimum [Member]
Equity investments, Ownership percentage	20.00%
Maximum [Member]
Equity investments, Ownership percentage	50.00%
Contractual customer relationships [Member] | Minimum [Member]
Estimated useful lives of intangible assets, maximum	4 years
Contractual customer relationships [Member] | Maximum [Member]
Estimated useful lives of intangible assets, maximum	12 years
Purchased software [Member]
Estimated useful lives of intangible assets, maximum	4 years
Trademarks and Licenses [Member] | Minimum [Member]
Estimated useful lives of intangible assets, maximum	3 years
Trademarks and Licenses [Member] | Maximum [Member]
Estimated useful lives of intangible assets, maximum	7 years

X

- Definition

Cumulative probability threshold for realization of income tax benefits.

+ References

No definition available.

+ Details

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X

- Definition

Minimum recognizable tax benefit.

+ References

No definition available.

+ Details

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Balance Type:	na
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X

- Definition

Sustainability Threshold for Uncertain Tax Position.

+ References

No definition available.

+ Details

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X

- Definition

Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 720

-SubTopic 35

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848



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

-Publisher AICPA

-Name Statement of Position (SOP)

-Number 93-7

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 159

-Paragraph 18

-Subparagraph f

-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 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571



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

-Publisher AICPA

-Name Accounting Principles Board Opinion (APB)

-Number 18

-Paragraph 20

-Subparagraph a (1)

-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.

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X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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