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NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO GILEAD COMMON STOCKHOLDERS
 9 Months Ended
Sep. 30, 2021
Earnings Per Share [Abstract]  
NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO GILEAD COMMON STOCKHOLDERS NET INCOME (LOSS) PER SHARE ATTRIBUTABLE TO GILEAD COMMON STOCKHOLDERS
Basic net income (loss) per share attributable to Gilead common stockholders is calculated based on the weighted average number of shares of our common stock outstanding during the period. Diluted net income (loss) per share attributable to Gilead common stockholders is calculated based on the weighted average number of shares of our common stock and other dilutive securities outstanding during the period. The potentially dilutive shares of our common stock resulting from the assumed exercise of outstanding stock options and equivalents were determined under the treasury stock method.
Potential shares of common stock excluded from the computation of diluted net income (loss) per share attributable to Gilead common stockholders because their effect would have been antidilutive were 14 million and 15 million for the three and nine months ended September 30, 2021, respectively, and 13 million and 38 million for the three and nine months ended September 30, 2020, respectively.
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)