Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net sales	$ 2,752	$ 2,543
Cost of products sold	894	806
Gross profit	1,858	1,737
Operating expenses:
Selling, general and administrative expenses	1,019	978
Research and development expenses	276	300
Royalty expense	12	12
Amortization expense	185	201
Intangible asset impairment charges	0	198
Contingent consideration net expense (benefit)	(6)	(108)
Restructuring net charges (credits)	5	10
Litigation-related net charges (credits)	4	0
Gain on disposal of business	(6)	0
Operating expenses	1,488	1,591
Operating income (loss)	370	146
Other income (expense):
Interest expense	(82)	(88)
Other, net	37	(36)
Income (loss) before income taxes	325	22
Income tax (benefit) expense	(16)	12
Net income (loss)	341	11
Preferred stock dividends	(14)	0
Net income (loss) available to common stockholders	$ 327	$ 11
Net income (loss) per common share — basic	$ 0.23	$ 0.01
Net income (loss) per common share — assuming dilution	$ 0.23	$ 0.01
Weighted-average shares outstanding
Basic	1,418.7	1,397.4
Assuming dilution	1,430.8	1,413.5