Condensed Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues:
Revenues	$ 5,281	$ 5,088
Costs and expenses:
Cost of goods sold	957	1,001
Research and development expenses	1,057	937
Selling, general and administrative expenses	1,030	997
Total costs and expenses	3,044	2,935
Income from operations	2,237	2,153
Interest expense	(254)	(290)
Other income (expense), net	367	170
Income before provision for income taxes	2,350	2,033
Provision for income taxes	382	494
Net income	1,968	1,539
Net income (loss) attributable to noncontrolling interest	(7)	1
Net income attributable to Gilead	$ 1,975	$ 1,538
Net income per share attributable to Gilead common stockholders - basic (usd per share)	$ 1.55	$ 1.18
Shares used in per share calculation - basic (in shares)	1,276	1,307
Net income per share attributable to Gilead common stockholders - diluted (usd per share)	$ 1.54	$ 1.17
Shares used in per share calculation - diluted (in shares)	1,283	1,320
Product sales
Revenues:
Revenues	$ 5,200	$ 5,001
Royalty, contract and other revenues
Revenues:
Revenues	$ 81	$ 87