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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, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Earnings Per Share [Abstract]        
Net income attributable to Gilead $ 1,789 $ 2,592 $ 2,952 $ 5,843
Shares used in per share calculation - basic (in shares) 1,255 1,256 1,255 1,256
Dilutive effect of stock options and equivalents (in shares) 6 6 5 6
Shares used in per share calculation - diluted (in shares) 1,261 1,262 1,261 1,262
Net income per share attributable to Gilead common stockholders - basic (in dollars per share) $ 1.43 $ 2.06 $ 2.35 $ 4.65
Net income per share attributable to Gilead common stockholders - diluted (in dollars per share) $ 1.42 $ 2.05 $ 2.34 $ 4.63