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EARNINGS PER SHARE - Schedule of the Calculation of Basic and Diluted EPS (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Earnings Per Share [Abstract]        
Net income attributable to Gilead $ 1,045 $ 1,144 $ 2,055 $ 1,163
Shares used in basic earnings per share attributable to Gilead calculation 1,249 1,256 1,249 1,255
Dilutive effect of stock options and equivalents 9 4 11 5
Shares used in diluted earnings per share attributable to Gilead calculation 1,258 1,260 1,260 1,261
Basic earnings per share attributable to Gilead (in dollars per share) $ 0.84 $ 0.91 $ 1.65 $ 0.93
Diluted earnings per share attributable to Gilead (in dollars per share) $ 0.83 $ 0.91 $ 1.63 $ 0.92