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Property And Equipment Net (Tables)
6 Months Ended
Jun. 30, 2012
Property and Equipment, Net [Abstract]  
Summary of Property and equipment
                                                 
    June 30, 2012     December 31, 2011  
(in $ millions)   Cost     Accumulated
depreciation
    Net     Cost     Accumulated
depreciation
    Net  
             

Capitalized software

    586       (330     256       600       (314     286  

Furniture, fixtures and equipment

    241       (146     95       240       (137     103  

Building and leasehold improvements

    11       (7     4       11       (7     4  

Construction in progress

    40             40       38             38  
   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

   

 

 

 
      878       (483     395       889       (458     431