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Property, plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2013
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
Property, plant and equipment consisted of the following as of December 31, 2013 and 2012 (dollar amounts in millions):
 
Useful life (in years)
 
2013
 
2012
Land
—

 
$
408

 
$
412

Buildings and improvements
10-40

 
3,467

 
3,510

Manufacturing equipment
8-12

 
2,024

 
2,007

Laboratory equipment
8-12

 
1,165

 
1,056

Other
3-15

 
4,107

 
3,891

Construction in progress
—

 
1,120

 
1,071

Property, plant and equipment, gross
 
 
12,291

 
11,947

Less accumulated depreciation and amortization
 
 
(6,942
)
 
(6,621
)
Property, plant and equipment, net
 
 
$
5,349

 
$
5,326