v2.4.0.6
Property, plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2012
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
Property, plant and equipment consisted of the following as of December 31, 2012 and 2011 (dollar amounts in millions):
 
Useful life (in years)
 
2012
 
2011
Land
—

 
$
412

 
$
366

Buildings and improvements
10-40

 
3,510

 
3,463

Manufacturing equipment
8-12

 
2,007

 
1,897

Laboratory equipment
8-12

 
1,056

 
1,016

Other
3-15

 
3,891

 
3,745

Construction in progress
—

 
1,071

 
744

Property, plant and equipment, gross
 
 
11,947

 
11,231

Less accumulated depreciation and amortization
 
 
(6,621
)
 
(5,811
)
Property, plant and equipment, net
 
 
$
5,326

 
$
5,420