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Other Financial Information (Tables)
12 Months Ended
Dec. 31, 2012
Other Financial Information  
Schedule of other current assets

  Other Current Assets  
 
  December 31,
2012
  December 31,
2011
 
 
  (Dollars in millions)
 

Prepaid expenses

  $ 195     186  

Other

    125     79  
           

Total other current assets

  $ 320     265