Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues:
Product sales	$ 23,362	$ 23,747	$ 22,849
Total revenues	23,362	23,747	22,849
Operating expenses:
Cost of sales	4,356	4,101	4,069
Research and development	4,116	3,737	3,562
Selling, general and administrative	5,150	5,332	4,870
Other	66	314	375
Total operating expenses	13,688	13,484	12,876
Operating income	9,674	10,263	9,973
Interest expense, net	1,289	1,392	1,304
Interest and other income, net	753	674	928
Income before income taxes	9,138	9,545	9,597
Provision for income taxes	1,296	1,151	7,618
Net income	$ 7,842	$ 8,394	$ 1,979
Earnings per share:
Basic (in usd per share)	$ 12.96	$ 12.70	$ 2.71
Diluted (in usd per share)	$ 12.88	$ 12.62	$ 2.69
Shares used in the calculation of earnings per share:
Basic (in shares)	605	661	731
Diluted (in shares)	609	665	735
Product sales [Member]
Revenues:
Product sales	$ 22,204	$ 22,533	$ 21,795
Other [Member]
Revenues:
Product sales	1,158	1,214	1,054
Total revenues	$ 1,158	$ 1,214	$ 1,054