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