Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Net sales	$ 9,048	$ 8,386	$ 7,477
Cost of products sold	2,593	2,424	2,173
Gross profit	6,455	5,962	5,304
Operating expenses:
Selling, general and administrative expenses	3,294	3,099	2,873
Research and development expenses	997	920	876
Royalty expense	68	79	70
Amortization expense	565	545	495
Intangible asset impairment charges	4	11	19
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	(80)	29	123
Restructuring charges (credits)	37	28	26
Litigation-related charges (credits)	285	804	1,105
Operating expenses	5,170	5,515	5,587
Operating income (loss)	1,285	447	(283)
Other income (expense):
Interest expense	(229)	(233)	(284)
Other, net	(124)	(37)	(83)
Income (loss) before income taxes	933	177	(650)
Income tax (benefit) expense	828	(170)	(411)
Net income (loss)	$ 104	$ 347	$ (239)
Net income (loss) per common share — basic	$ 0.08	$ 0.26	$ (0.18)
Net income (loss) per common share — assuming dilution	$ 0.08	$ 0.25	$ (0.18)
Pension termination charges	$ 0	$ 0	$ 44
Weighted-average shares outstanding
Basic	1,370.1	1,357.6	1,341.2
Assuming dilution	1,392.7	1,377.2	1,341.2