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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, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income attributable to Gilead	$ 1,551	$ 1,975
Shares used in per share calculation - basic (in shares)	1,262	1,276
Dilutive effect of stock options and equivalents (in shares)	8	7
Shares used in per share calculation - diluted (in shares)	1,270	1,283
Net income per share attributable to Gilead common stockholders - basic (usd per share)	$ 1.23	$ 1.55
Net income per share attributable to Gilead common stockholders - diluted (usd per share)	$ 1.22	$ 1.54

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