Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net sales	$ 2,379	$ 2,160
Cost of products sold	672	650
Gross profit	1,707	1,510
Operating expenses:
Selling, general and administrative expenses	860	794
Research and development expenses	261	235
Royalty expense	18	17
Amortization expense	141	143
Intangible asset impairment charges	1	0
Restructuring charges (credits)	13	4
Contingent consideration expense (benefit)	5	(50)
Litigation-related net charges (credits)	0	3
Operating expenses	1,300	1,146
Operating income (loss)	407	364
Other income (expense):
Interest expense	(61)	(57)
Other, net	(23)	(2)
Income (loss) before income taxes	323	305
Income tax expense (benefit)	26	15
Net income (loss)	$ 298	$ 290
Net income (loss) per common share — basic	$ 0.22	$ 0.21
Net income (loss) per common share — assuming dilution	$ 0.21	$ 0.21
Weighted-average shares outstanding
Basic	1,376.5	1,365.4
Assuming dilution	1,396.8	1,390.2