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Property, Plant And Equipment
12 Months Ended
Dec. 31, 2015
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
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



See Note 9 to our consolidated financial statements for discussion on asset impairment.

In the fourth quarter of 2015, we closed on the sale of our office facility located in Greenford, U.K. for approximately $33 million in net cash proceeds. The sale resulted in a pre-tax gain of $23 million on disposition of assets on our consolidated statements of operations. We also closed on the sale of our office facility located in Birmingham, Alabama for approximately $6 million in net cash proceeds.

Depreciation expense was $35 million, $61 million, and $54 million for the years ended December 31, 2015, 2014 and 2013, respectively.