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Commitments and Contingencies - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Commitments and Contingencies [Line Items]
Accrual relating to the current best estimate of probable liabilities	$ 3
Maximum future payment obligation of the guaranteed value and associated liabilities	4
Rental expense	25	23	17
Sublease rental income	$ 3	$ 3	$ 4

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

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-Publisher FASB

-Name FASB Interpretation (FIN)

-Number 45

-Paragraph 13

-Subparagraph b

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-Publisher FASB

-Name Accounting Standards Codification

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-Section 50

-Paragraph 4

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- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

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-Paragraph 9, 10, 11, 12

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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

The amount of revenue recognized for the period under subleasing arrangements.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

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- Definition

This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

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