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Intangible Assets
9 Months Ended
Sep. 30, 2011
Intangible Assets [Abstract] 
Intangible Assets
9. Intangible Assets
Intangible assets principally comprise technology/technical know-how, tradenames and customer relationships. The gross book value, accumulated amortization and net book value of intangible assets were as follows:
                                                 
                                    (Stated in millions)  
    Sept. 30, 2011     Dec. 31, 2010  
    Gross     Accumulated     Net Book     Gross     Accumulated     Net Book  
    Book Value     Amortization     Value     Book Value     Amortization     Value  
         
Technology/Technical Know-How
  $ 1,835     $ 303     $ 1,532     $ 1,846     $ 215     $ 1,631  
Tradenames
    1,671       107       1,564       1,678       61       1,617  
Customer Relationships
    1,954       185       1,769       1,963       129       1,834  
Other
    361       299       62       378       298       80  
         
 
  $ 5,821     $ 894     $ 4,927     $ 5,865     $ 703     $ 5,162  
         
Amortization expense charged to income was as follows:
                 
    (Stated in millions)  
    2011     2010  
Third Quarter
  $ 81     $ 46  
Nine Months
  $ 245     $ 109  
The weighted average amortization period for all intangible assets is approximately 21 years.
Based on the net book value of intangible assets at September 30, 2011, amortization charged to income for the subsequent five years is estimated to be: remainder of 2011 — $81 million; 2012 — $303 million; 2013 — $295 million; 2014 — $286 million; 2015 — $265 million; and 2016 — $255 million.