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NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO GILEAD COMMON STOCKHOLDERS (Tables)
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
Schedule of the Calculation of Basic and Diluted Earnings Per Share
The following table summarizes the calculation of basic and diluted net income (loss) per share attributable to Gilead common stockholders:
 Three Months EndedNine Months Ended
September 30,September 30,
(in millions, except per share amounts)2021202020212020
Net income (loss) attributable to Gilead$2,592 $360 $5,843 $(1,428)
Shares used in per share calculation - basic1,256 1,255 1,256 1,257 
Dilutive effect of stock options and equivalents6 6 6 — 
Shares used in per share calculation - diluted1,262 1,261 1,262 1,257 
Net income (loss) per share attributable to Gilead common stockholders - basic$2.06 $0.29 $4.65 $(1.14)
Net income (loss) per share attributable to Gilead common stockholders - diluted$2.05 $0.29 $4.63 $(1.14)