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Discontinued Operations - Operating Results of Discontinued Operations (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain (loss) on disposal of discontinued operations	$ (2)	$ 8	$ (7)
Provision (benefit) for income tax	(1)	3	(3)
Net gain (loss) on disposal of discontinued operations, net of tax	$ (1)	$ 5	$ (4)

Amount of gain (loss), after tax expense or benefit and not previously recognized, resulting from the sale of a business component.

Amount of tax expense or benefit on gain (loss), not previously recognized, resulting from the sale of a business component.