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NET INCOME PER SHARE ATTRIBUTABLE TO GILEAD COMMON STOCKHOLDERS
 3 Months Ended
Mar. 31, 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.
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 16 million and 15 million, for the three months ended March 31, 2022 and 2021 respectively.
The following table shows the calculation of basic and diluted net income per share attributable to Gilead common stockholders:
 Three Months Ended
March 31,
(in millions, except per share amounts)20222021
Net income attributable to Gilead$19 $1,729 
Shares used in per share calculation - basic1,255 1,256 
Dilutive effect of stock options and equivalents6 6 
Shares used in per share calculation - diluted1,262 1,262 
Net income per share attributable to Gilead common stockholders - basic$0.02 $1.38 
Net income per share attributable to Gilead common stockholders - diluted$0.02 $1.37