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Property, Plant And Equipment (Tables)
12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Summary of Property, Plant and Equipment
The components of our property, plant and equipment balance are as follows:
  
Estimated
Useful
Lives in Years
 
December 31,
Dollars in millions
 
2015
 
2014
Land
N/A
 
$
7

 
$
13

Buildings and property improvements
5 - 44
 
140

 
198

Equipment and other
3 - 25
 
374

 
421

Total
 
 
521

 
632

Less accumulated depreciation
 
 
(352
)
 
(385
)
Net property, plant and equipment
 
 
$
169

 
$
247