Condensed Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues:
Total revenues	$ 5,557	$ 5,554
Operating expenses:
Cost of sales	1,055	944
Research and development	879	760
Selling, general and administrative	1,154	1,127
Other	(3)	(3)
Total operating expenses	3,085	2,828
Operating income	2,472	2,726
Interest expense, net	343	338
Interest and other income, net	185	231
Income before income taxes	2,314	2,619
Provision for income taxes	322	308
Net income	$ 1,992	$ 2,311
Earnings per share:
Basic (in usd per share)	$ 3.20	$ 3.27
Diluted (in usd per share)	$ 3.18	$ 3.25
Shares used in calculation of earnings per share:
Basic (in shares)	622	707
Diluted (in shares)	626	711
Product sales [Member]
Revenues:
Product sales	$ 5,286	$ 5,343
Other revenues [Member]
Revenues:
Total revenues	$ 271	$ 211