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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
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income attributable to Gilead	$ 1,729	$ 1,551
Shares used in per share calculation - basic (in shares)	1,256	1,262
Dilutive effect of stock options and equivalents (in shares)	6	8
Shares used in per share calculation - diluted (in shares)	1,262	1,270
Net income per share attributable to Gilead common stockholders - basic (in dollars per share)	$ 1.38	$ 1.23
Net income per share attributable to Gilead common stockholders - diluted (in dollars per share)	$ 1.37	$ 1.22

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