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NET INCOME PER SHARE ATTRIBUTABLE TO GILEAD COMMON STOCKHOLDERS
 6 Months Ended
Jun. 30, 2022
Earnings Per Share [Abstract]  
NET INCOME PER SHARE ATTRIBUTABLE TO GILEAD COMMON STOCKHOLDERS NET INCOME PER SHARE ATTRIBUTABLE TO GILEAD COMMON STOCKHOLDERS
Basic net income 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 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.
The following table shows the calculation of basic and diluted net income per share attributable to Gilead common stockholders:
 Three Months EndedSix Months Ended
June 30,June 30,
(in millions, except per share amounts)2022202120222021
Net income attributable to Gilead$1,144 $1,522 $1,163 $3,251 
Shares used in per share calculation - basic1,256 1,255 1,255 1,256 
Dilutive effect of stock options and equivalents4 5 5 5 
Shares used in per share calculation - diluted1,260 1,260 1,261 1,261 
Net income per share attributable to Gilead common stockholders - basic$0.91 $1.21 $0.93 $2.59 
Net income per share attributable to Gilead common stockholders - diluted$0.91 $1.21 $0.92 $2.58 
Potential shares of common stock excluded from the computation of diluted net income per share attributable to Gilead common stockholders because their effect would have been antidilutive were 20 million and 17 million for the three and six months ended June 30, 2022, respectively, and 19 million and 16 million, for the three and six months ended June 30, 2021 respectively.