Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenues
Revenues	$ 22,449	$ 22,127	$ 26,107
Costs and Expenses
Cost of goods sold	4,675	4,853	4,371
Research and development expenses	9,106	5,018	3,734
Selling, general and administrative expenses	4,381	4,056	3,878
Total costs and expenses	18,162	13,927	11,983
Income from operations	4,287	8,200	14,124
Interest expense	(995)	(1,077)	(1,118)
Other income (expense), net	1,868	676	523
Income before provision for income taxes	5,160	7,799	13,529
Provision for income taxes	(204)	2,339	8,885
Net income	5,364	5,460	4,644
Net (loss) income attributable to noncontrolling interest	(22)	5	16
Net income attributable to Gilead	$ 5,386	$ 5,455	$ 4,628
Net income per share attributable to Gilead common stockholders - basic	$ 4.24	$ 4.20	$ 3.54
Shares used in per share calculation - basic	1,270	1,298	1,307
Net income per share attributable to Gilead common stockholders - diluted	$ 4.22	$ 4.17	$ 3.51
Shares used in per share calculation - diluted	1,277	1,308	1,319
Product sales
Revenues
Revenues	$ 22,119	$ 21,677	$ 25,662
Royalty, contract and other revenues
Revenues
Revenues	$ 330	$ 450	$ 445