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Revenues, Income Before Taxes, and Gain on Dispositions, net of tax in Discontinued Operations (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Revenues $ 5 $ 14 $ 81
Loss before taxes (4) (3) (88)
Gain (loss) on disposals, net of tax   $ (2) $ 26