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Goodwill and Other Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2012
Schedule of Other Intangible Assets

Our other intangible assets as of December 31, 2012 and 2011 were comprised of the following (in millions):

 

     Customer
Contracts  and
Customer
Relationships		     Covenants
Not-to-
Compete		     Licenses,
Permits
and Other		     Total  

December 31, 2012:

         

Intangible assets

    $ 426      $ 97      $ 127      $ 650   

Less accumulated amortization

      (167 )      (54 )      (32 )      (253 ) 
  

 

 

    

 

 

    

 

 

    

 

 

  
   $ 259      $ 43      $ 95      $ 397   
  

 

 

    

 

 

    

 

 

    

 

 

  

December 31, 2011:

         

Intangible assets

    $ 392      $ 91      $ 161      $ 644   

Less accumulated amortization

      (119 )      (41 )      (27 )      (187 ) 
  

 

 

    

 

 

    

 

 

    

 

 

  
   $ 273      $ 50      $ 134      $ 457