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Other Current Assets
9 Months Ended
Sep. 30, 2011
Other Current Assets [Abstract] 
Other Current Assets
 
5.  Other Current Assets
 
Other current assets consisted of:
 
                 
    September 30,
 		    December 31,
 		 
(in $ millions)   2011     2010  
 
Upfront inducement payments and supplier deposits
    67       73  
Sales and use tax receivables
    50       47  
Prepaid expenses
    18       15  
Assets held for sale
    16       16  
Derivative assets
    8       15  
Other
    23       19  
                 
      182       185  
                 
 
Assets held for sale consisted of land and buildings expected to be sold within the next twelve months.