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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, 2022
Mar. 31, 2021
Earnings Per Share [Abstract]    
Net income attributable to Gilead $ 19 $ 1,729
Shares used in per share calculation - basic (in shares) 1,255 1,256
Dilutive effect of stock options and equivalents (in shares) 6 6
Shares used in per share calculation - diluted (in shares) 1,262 1,262
Net income per share attributable to Gilead common stockholders - basic (in dollars per share) $ 0.02 $ 1.38
Net income per share attributable to Gilead common stockholders - diluted (in dollars per share) $ 0.02 $ 1.37