Condensed Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues:
Revenues	$ 5,685	$ 5,648	$ 10,966	$ 10,736
Costs and expenses:
Cost of goods sold	1,000	1,196	1,957	2,197
Research and development expenses	1,160	1,192	2,217	2,129
Selling, general and administrative expenses	1,095	980	2,125	1,977
Total costs and expenses	3,255	3,368	6,299	6,303
Income from operations	2,430	2,280	4,667	4,433
Interest expense	(248)	(266)	(502)	(556)
Other income (expense), net	228	72	595	242
Income before provision for income taxes	2,410	2,086	4,760	4,119
Provision for income taxes	535	267	917	761
Net income	1,875	1,819	3,843	3,358
Net income (loss) attributable to noncontrolling interest	(5)	2	(12)	3
Net income attributable to Gilead	$ 1,880	$ 1,817	$ 3,855	$ 3,355
Net income per share attributable to Gilead common stockholders - basic (usd per share)	$ 1.48	$ 1.40	$ 3.03	$ 2.58
Shares used in per share calculation - basic (in shares)	1,270	1,298	1,273	1,302
Net income per share attributable to Gilead common stockholders - diluted (usd per share)	$ 1.47	$ 1.39	$ 3.01	$ 2.55
Shares used in per share calculation - diluted (in shares)	1,277	1,308	1,280	1,314
Product sales
Revenues:
Revenues	$ 5,607	$ 5,540	$ 10,807	$ 10,541
Royalty, contract and other revenues
Revenues:
Revenues	$ 78	$ 108	$ 159	$ 195