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Fair Value of Financial Investments and Liabilities - Income from Financial Investments, Net, Included in Other, Net, within Other Income (Expense), Net, and Impairment Charges for Financial Investments (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended 1 Months Ended 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2010
Asahi Tec [Member]
Jul. 31, 2012
Private Equity Funds [Member]
Dec. 31, 2012
Private Equity Funds [Member]
Dec. 31, 2010
Private Equity Funds [Member]
Dec. 31, 2010
Other private Investments [Member]
Schedule of Investments [Line Items]                
Realized gains from marketable securities   $ 41 $ 10          
Realized losses from marketable securities     (8)          
Income from other investments, net 24 32 7          
Income from financial investments, net 24 73 9          
Impairment charges:                
Total impairment charges $ (2)   $ (34) $ (28) $ (2) $ (2) $ (4) $ (2)