Condensed Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues:
Total revenues	$ 5,904	$ 5,773	$ 17,517	$ 17,047
Operating expenses:
Cost of sales	1,037	990	3,005	3,010
Research and development	926	877	2,555	2,519
Selling, general and administrative	1,293	1,170	3,773	3,443
Other	325	297	303	347
Total operating expenses	3,581	3,334	9,636	9,319
Operating income	2,323	2,439	7,881	7,728
Interest expense, net	355	325	1,040	972
Interest and other income, net	126	267	519	627
Income before income taxes	2,094	2,381	7,360	7,383
Provision for income taxes	235	360	894	1,140
Net income	$ 1,859	$ 2,021	$ 6,466	$ 6,243
Earnings per share:
Basic (in usd per share)	$ 2.88	$ 2.78	$ 9.67	$ 8.52
Diluted (in usd per share)	$ 2.86	$ 2.76	$ 9.61	$ 8.46
Shares used in calculation of earnings per share:
Basic (in shares)	645	728	669	733
Diluted (in shares)	649	733	673	738
Dividends paid per share (in usd per share)	$ 1.32	$ 1.15	$ 3.96	$ 3.45
Product sales [Member]
Revenues:
Product sales	$ 5,510	$ 5,453	$ 16,532	$ 16,226
Other revenues [Member]
Revenues:
Total revenues	$ 394	$ 320	$ 985	$ 821