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Investments - Company's Combined Proportionate Share of Major Components of Financial Statements (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of Equity Method Investments [Line Items]      
Current assets $ 344 $ 389  
Long-term assets 74 173  
Current liabilities 150 203  
Long-term liabilities 60 58  
Sales 967 881 698
Cost of goods sold, expenses and income taxes 814 805 580
Net income $ 153 $ 76 $ 118