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NET INCOME PER SHARE ATTRIBUTABLE TO GILEAD COMMON STOCKHOLDERS
 3 Months Ended
Mar. 31, 2021
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 15 million and 14 million, for the three months ended March 31, 2021 and 2020, respectively.
The following table summarizes 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)20212020
Net income attributable to Gilead$1,729 $1,551 
Shares used in per share calculation - basic1,256 1,262 
Dilutive effect of stock options and equivalents6 8 
Shares used in per share calculation - diluted1,262 1,270 
Net income per share attributable to Gilead common stockholders - basic$1.38 $1.23 
Net income per share attributable to Gilead common stockholders - diluted$1.37 $1.22