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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 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Earnings Per Share [Abstract]        
Net income (loss) attributable to Gilead $ 1,960 $ 1,614 $ 3,275 $ (2,556)
Shares used in basic earnings (loss) per share attributable to Gilead calculation (in shares) 1,245 1,247 1,246 1,247
Dilutive effect of equity-based awards (in shares) 10 4 12 0
Shares used in diluted earnings (loss) per share attributable to Gilead calculation (in shares) 1,255 1,251 1,257 1,247
Basic earnings (loss) per share attributable to Gilead (in dollars per share) $ 1.57 $ 1.29 $ 2.63 $ (2.05)
Diluted earnings (loss) per share attributable to Gilead (in dollars per share) $ 1.56 $ 1.29 $ 2.61 $ (2.05)