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Accrued Liabilities (Tables)
9 Months Ended
Sep. 30, 2011
Accrued Liabilities [Abstract] 
Accrued Liabilities
Accrued liabilities consist of (in millions):
                 
    September 30,     December 31,  
    2011     2010  
Customer prepayments and billings
  $ 638     $ 387  
Accrued purchase orders
    405       597  
Compensation
    358       403  
Warranty
    232       215  
Taxes (non income)
    89       93  
Insurance
    70       49  
Fair value of derivatives
    47       22  
Interest
    8       11  
Other
    307       328  
 
           
Total
  $ 2,154     $ 2,105  
 
           
Changes in the carrying amount of service and product warranties
The changes in the carrying amount of service and product warranties are as follows (in millions):
         
Balance at December 31, 2010
  $ 215  
 
     
Net provisions for warranties issued during the year
    44  
Amounts incurred
    (28 )
Foreign currency translation and other
    1  
 
     
Balance at September 30, 2011
  $ 232