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Net Income Per Share Attributable to Gilead Common Stockholders - Schedule of the Calculation of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Earnings Per Share [Abstract]
Net income attributable to Gilead	$ 2,097	$ 2,718	$ 5,452	$ 8,493
Shares used in per share calculation - basic (in shares)	1,296	1,306	1,302	1,307
Dilutive effect of stock options and equivalents (in shares)	11	13	11	12
Shares used in per share calculation - diluted (in shares)	1,307	1,319	1,313	1,319
Net income per share attributable to Gilead common stockholders - basic (usd per share)	$ 1.62	$ 2.08	$ 4.19	$ 6.50
Net income per share attributable to Gilead common stockholders - diluted (usd per share)	$ 1.60	$ 2.06	$ 4.15	$ 6.44

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