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Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Earnings Per Share [Abstract]      
Net income attributable to Gilead $ 4,592 $ 6,225 $ 123
Shares used in basic earnings per share attributable to Gilead calculation (in shares) 1,255 1,256 1,257
Dilutive effect of stock options and equivalents (in shares) 7 6 6
Shares used in diluted earnings per share attributable to Gilead calculation (in shares) 1,262 1,262 1,263
Basic earnings per share attributable to Gilead (in dollars per share) $ 3.66 $ 4.96 $ 0.10
Diluted earnings per share attributable to Gilead (in dollars per share) $ 3.64 $ 4.93 $ 0.10