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NET INCOME PER SHARE ATTRIBUTABLE TO GILEAD COMMON STOCKHOLDERS (Tables)
3 Months Ended
Mar. 31, 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 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 equivalents
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