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EARNINGS PER SHARE - Summary of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Earnings Per Share [Abstract]      
Net income attributable to Gilead $ 480 $ 5,665 $ 4,592
Shares used in basic earnings per share attributable to Gilead calculation (in shares) 1,247 1,248 1,255
Dilutive effect of stock options and equivalents (in shares) 8 10 7
Shares used in diluted earnings per share attributable to Gilead calculation (in shares) 1,255 1,258 1,262
Basic earnings per share attributable to Gilead (in dollars per share) $ 0.38 $ 4.54 $ 3.66
Diluted earnings per share attributable to Gilead (in dollars per share) $ 0.38 $ 4.50 $ 3.64