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EARNINGS (LOSS) PER SHARE - Summary of the Calculation of Basic and Diluted Earnings (Loss) Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Earnings Per Share [Abstract]    
Net income (loss) attributable to Gilead $ 1,315 $ (4,170)
Shares used in basic earnings (loss) per share attributable to Gilead calculation (in shares) 1,246 1,247
Dilutive effect of stock options and equivalents (in shares) 13 0
Shares used in diluted earnings (loss) per share attributable to Gilead calculation (in shares) 1,259 1,247
Basic earnings (loss) per share attributable to Gilead (in dollars per share) $ 1.06 $ (3.34)
Diluted earnings (loss) per share attributable to Gilead (in dollars per share) $ 1.04 $ (3.34)