Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues:
Product sales	$ 21,795	$ 21,892	$ 20,944
Other revenues	1,054	1,099	718
Total revenues	22,849	22,991	21,662
Operating expenses:
Cost of sales	4,069	4,162	4,227
Research and development	3,562	3,840	4,070
Selling, general and administrative	4,870	5,062	4,846
Other	375	133	49
Total operating expenses	12,876	13,197	13,192
Operating income	9,973	9,794	8,470
Interest expense, net	1,304	1,260	1,095
Interest and other income, net	928	629	603
Income before income taxes	9,597	9,163	7,978
Provision for income taxes	7,618	1,441	1,039
Net income	$ 1,979	$ 7,722	$ 6,939
Earnings per share:
Basic (in usd per share)	$ 2.71	$ 10.32	$ 9.15
Diluted (in usd per share)	$ 2.69	$ 10.24	$ 9.06
Shares used in the calculation of earnings per share:
Basic (in shares)	731	748	758
Diluted (in shares)	735	754	766