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Net Income Per Share Attributable to Gilead Common Shareholders - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Earnings Per Share [Abstract]
Net Income (Loss) Attributable to Parent	$ 1,551	$ 360	$ (3,339)	$ 1,551	$ 2,696	$ (1,165)	$ 1,880	$ 1,975	$ 123	$ 5,386	$ 5,455
Shares used in per share calculation - basic (in shares)									1,257	1,270	1,298
Dilutive effect of stock options and equivalents (in shares)									6	7	10
Shares used in per share calculation - diluted (in shares)									1,263	1,277	1,308
Net income per share attributable to Gilead common stockholders - basic (usd per share)	$ 1.24	$ 0.29	$ (2.66)	$ 1.23	$ 2.13	$ (0.92)	$ 1.48	$ 1.55	$ 0.10	$ 4.24	$ 4.20
Net income per share attributable to Gilead common stockholders - diluted (usd per share)	$ 1.23	$ 0.29	$ (2.66)	$ 1.22	$ 2.12	$ (0.92)	$ 1.47	$ 1.54	$ 0.10	$ 4.22	$ 4.17

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