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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 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share [Abstract]        
Net income (loss) attributable to Gilead $ 3,052 $ 1,253 $ 6,327 $ (1,303)
Shares used in basic earnings (loss) per share attributable to Gilead calculation (in shares) 1,243 1,247 1,245 1,247
Dilutive effect of equity-based awards (in shares) 11 7 11 0
Shares used in diluted earnings (loss) per share attributable to Gilead calculation (in shares) 1,254 1,254 1,256 1,247
Basic earnings (loss) per share attributable to Gilead (in dollars per share) $ 2.46 $ 1.00 $ 5.08 $ (1.04)
Diluted earnings (loss) per share attributable to Gilead (in dollars per share) $ 2.43 $ 1.00 $ 5.04 $ (1.04)