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Inventories (Tables)
 12 Months Ended
Dec. 31, 2014
Inventories [Abstract]  
Inventories
Inventories consisted of the following:

  
December 31,
 
(dollars in millions)
 
2014
  
2013
 
     
Raw materials
 
$
159
  
$
238
 
Work-in-process
  
827
   
894
 
Finished goods, including parts and subassemblies
  
2,150
   
2,208
 
Other
  
24
   
22
 
   
3,160
   
3,362
 
Excess of current costs over LIFO costs
  
(86
)
  
(120
)
Allowance for obsolete and excess inventory
  
(145
)
  
(109
)
         
Total inventories
 
$
2,929
  
$
3,133