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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, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Earnings Per Share [Abstract]        
Net income (loss) attributable to Gilead $ 1,253 $ 2,180 $ (1,303) $ 4,236
Shares used in basic earnings (loss) per share attributable to Gilead calculation (in shares) 1,247 1,248 1,247 1,249
Dilutive effect of stock options and equivalents (in shares) 7 8 0 10
Shares used in diluted earnings (loss) per share attributable to Gilead calculation (in shares) 1,254 1,257 1,247 1,259
Basic earnings (loss) per share attributable to Gilead (in dollars per share) $ 1.00 $ 1.75 $ (1.04) $ 3.39
Diluted earnings (loss) per share attributable to Gilead (in dollars per share) $ 1.00 $ 1.73 $ (1.04) $ 3.37