Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenues
Revenues	$ 22,127	$ 26,107	$ 30,390
Costs and Expenses
Cost of goods sold	4,853	4,371	4,261
Research and development expenses	5,018	3,734	5,098
Selling, general and administrative expenses	4,056	3,878	3,398
Total costs and expenses	13,927	11,983	12,757
Income from operations	8,200	14,124	17,633
Interest expense	(1,077)	(1,118)	(964)
Other income (expense), net	676	523	428
Income before provision for income taxes	7,799	13,529	17,097
Provision for income taxes	2,339	8,885	3,609
Net income	5,460	4,644	13,488
Net income (loss) attributable to noncontrolling interest	5	16	(13)
Net income attributable to Gilead	$ 5,455	$ 4,628	$ 13,501
Net income per share attributable to Gilead common stockholders - basic	$ 4.20	$ 3.54	$ 10.08
Shares used in per share calculation - basic	1,298	1,307	1,339
Net income per share attributable to Gilead common stockholders - diluted	$ 4.17	$ 3.51	$ 9.94
Shares used in per share calculation - diluted	1,308	1,319	1,358
Product sales
Revenues
Revenues	$ 21,677	$ 25,662	$ 29,953
Royalty, contract and other revenues
Revenues
Revenues	$ 450	$ 445	$ 437