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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2011
Commitments and Contingencies [Abstract]  
Future minimum payments under non-cancelable operating leases
                         
    Real Estate     Equipment     Total  
    (in millions)  

2012

  $ 167     $ 11     $ 178  

2013

    120       6       126  

2014

    101       3       104  

2015

    68       1       69  

2016

    50             50  

Thereafter

    103             103  
   

 

 

   

 

 

   

 

 

 

Total minimum payments required

    609       21       630  

Less: Sublease rentals under non-cancelable leases

    10             10  
   

 

 

   

 

 

   

 

 

 

Net minimum payments required

  $     599     $     21     $     620