Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Revenues
Product sales	$ 25,662	$ 29,953	$ 32,151
Royalty, contract and other revenues	445	437	488
Total revenues	26,107	30,390	32,639
Costs and Expenses
Cost of goods sold	4,371	4,261	4,006
Research and development expenses	3,734	5,098	3,014
Selling, general and administrative expenses	3,878	3,398	3,426
Total costs and expenses	11,983	12,757	10,446
Income from operations	14,124	17,633	22,193
Interest expense	(1,118)	(964)	(688)
Other income (expense), net	523	428	154
Income before provision for income taxes	13,529	17,097	21,659
Provision for income taxes	8,885	3,609	3,553
Net income	4,644	13,488	18,106
Net income (loss) attributable to noncontrolling interest	16	(13)	(2)
Net income attributable to Gilead	$ 4,628	$ 13,501	$ 18,108
Net income per share attributable to Gilead common stockholders - basic	$ 3.54	$ 10.08	$ 12.37
Shares used in per share calculation - basic	1,307	1,339	1,464
Net income per share attributable to Gilead common stockholders - diluted	$ 3.51	$ 9.94	$ 11.91
Shares used in per share calculation - diluted	1,319	1,358	1,521
Cash dividends declared per share	$ 2.08	$ 1.84	$ 1.29