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Property, plant and equipment (Tables)
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property, plant and equipment
Property, plant and equipment consisted of the following (dollar amounts in millions):
 
 
 
December 31,
 
Useful life (in years)
 
2016
 
2015
Land
—

 
$
295

 
$
319

Buildings and improvements
10-40

 
3,640

 
3,638

Manufacturing equipment
8-12

 
2,275

 
2,051

Laboratory equipment
8-12

 
1,092

 
1,140

Other
3-15

 
4,380

 
4,278

Construction in progress
—

 
745

 
746

Property, plant and equipment, gross
 
 
12,427

 
12,172

Less accumulated depreciation and amortization
 
 
(7,466
)
 
(7,265
)
Property, plant and equipment, net
 
 
$
4,961

 
$
4,907