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Investments (Details 1) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Balance Sheets      
Current assets $ 383 $ 420  
Long-term assets 158 155  
Current liabilities 190 164  
Long-term liabilities 43 57  
Statements of Income      
Sales 881 698 578
Cost of goods sold, expenses and income taxes 805 580 473
Net income $ 76 $ 118 $ 105