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EARNINGS PER SHARE - Summary of the Calculation of Basic and Diluted Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share [Abstract]        
Net income attributable to Gilead $ 2,180 $ 1,789 $ 4,236 $ 2,952
Shares used in basic earnings per share attributable to Gilead calculation (in shares) 1,248 1,255 1,249 1,255
Dilutive effect of stock options and equivalents (in shares) 8 6 10 5
Shares used in diluted earnings per share attributable to Gilead calculation (in shares) 1,257 1,261 1,259 1,261
Basic earnings per share attributable to Gilead (in dollars per share) $ 1.75 $ 1.43 $ 3.39 $ 2.35
Diluted earnings per share attributable to Gilead (in dollars per share) $ 1.73 $ 1.42 $ 3.37 $ 2.34