Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Net sales	$ 2,543	$ 2,493
Cost of products sold	806	730
Gross profit	1,737	1,763
Operating expenses:
Selling, general and administrative expenses	978	869
Research and development expenses	300	280
Royalty expense	12	16
Amortization expense	201	160
Intangible asset impairment charges	198	67
Contingent consideration expense (benefit)	(108)	(28)
Restructuring charges (credits)	10	6
Litigation-related net charges (credits)	0	(148)
Operating expenses	1,591	1,222
Operating income (loss)	146	541
Other income (expense):
Interest expense	(88)	(109)
Other, net	(36)	25
Income (loss) before income taxes	22	457
Income tax expense (benefit)	12	33
Net income (loss)	$ 11	$ 424
Net income (loss) per common share — basic	$ 0.01	$ 0.31
Net income (loss) per common share — assuming dilution	$ 0.01	$ 0.30
Weighted-average shares outstanding
Basic	1,397.4	1,387.7
Assuming dilution	1,413.5	1,408.4