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Segment Information (Tables)
12 Months Ended
Dec. 31, 2012
Segment Information [Abstract]  
Geographic segment information
                                 
(in $ millions)   United
States
    United
Kingdom
    All Other
Countries
    Total  

Net Revenue

                               

Year ended December 31, 2012

    795       155       1,052       2,002  

Year ended December 31, 2011

    873       152       1,010       2,035  

Year ended December 31, 2010

    855       141       1,000       1,996  

Long-Lived Assets (excluding financial instruments and deferred tax assets)

                               

As of December 31, 2012

    1,774       27       864       2,665  

As of December 31, 2011

    1,749       37       1,077       2,863  

As of December 31, 2010

    1,878       61       1,042       2,981