Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net sales	$ 2,160	$ 1,964
Cost of products sold	650	573
Gross profit	1,510	1,391
Operating expenses:
Selling, general and administrative expenses	794	716
Research and development expenses	235	210
Royalty expense	17	19
Amortization expense	143	136
Contingent consideration expense (benefit)	(50)	4
Restructuring charges (credits)	4	3
Litigation-related charges (credits)	3	10
Operating expenses	1,146	1,098
Operating income (loss)	364	293
Other income (expense):
Interest expense	(57)	(59)
Other, net	(2)	(6)
Income (loss) before income taxes	305	228
Income tax expense (benefit)	15	26
Net income (loss)	$ 290	$ 202
Net income (loss) per common share — basic	$ 0.21	$ 0.15
Net income (loss) per common share — assuming dilution	$ 0.21	$ 0.15
Weighted-average shares outstanding
Basic	1,365.4	1,350.4
Assuming dilution	1,390.2	1,369.9