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Restructuring and Asset Impairment Charges (Tables)
9 Months Ended
Sep. 30, 2011
Restructuring and Asset Impairment Charges [Abstract] 
Restructuring and asset impairment charges
                                 
    Three Months     Nine Months  
For the Periods Ended September 30   2011     2010     2011     2010  
Restructuring costs presented in costs of revenue
  $ —     $ 3     $ 6     $ 12  
Restructuring costs presented in operating expenses
    —       3       7       30  
Asset impairment
    2       —       3       —  
                                 
Total restructuring and asset impairment costs
  $ 2     $ 6     $ 16     $ 42