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Fixed Assets
12 Months Ended
Dec. 31, 2011
Fixed Assets [Abstract]  
Fixed Assets

6.     Fixed Assets

A summary of fixed assets follows:

 

 

                 

(Stated in millions)

 

 
As at December 31,   2011     2010  

Land

    $362       $314  

Buildings & improvements

    2,912       2,631  

Machinery & equipment

    24,404       21,873  

Seismic vessels

    1,873       1,861  

 

   

 

 

 
      29,551       26,679  

Less accumulated depreciation

    16,558       14,608  

 

   

 

 

 
      $12,993       $12,071  
   

 

 

   

 

 

 

The estimated useful lives of Buildings & improvements are primarily 30 to 40 years. The estimated useful lives of Machinery & equipment are primarily 5 to 10 years. Seismic vessels are depreciated over periods ranging from 20 to 30 years.

Depreciation expense relating to fixed assets was $2.7 billion, $2.4 billion and $2.1 billion in 2011, 2010 and 2009, respectively.