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NET INCOME PER SHARE ATTRIBUTABLE TO GILEAD COMMON STOCKHOLDERS - Additional Information (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Earnings Per Share [Abstract]        
Antidilutive securities excluded from earnings per share computation (in shares) 17 14 17 15