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Investments in Equity-Accounted Investees - Results Relating to Equity-Accounted Investees (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule Of Results Related To Equity Accounted Investees [Line Items]      
Company's share in income (loss) $ 7 $ (77) $ (86)
Other results (34)    
Results relating to equity-accounted investees $ (27) $ (77) $ (86)