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Net Income Per Share Attributable to Gilead Common Shareholders
 12 Months Ended
Dec. 31, 2020
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 shareholders because their effect would have been antidilutive were 13 million, 14 million and 13 million during 2020, 2019 and 2018, respectively.
The following table shows the calculation of basic and diluted net income per share attributable to Gilead common stockholders:
Year Ended December 31,
(in millions, except per share amounts)202020192018
Net income attributable to Gilead$123 $5,386 $5,455 
Shares used in per share calculation - basic1,257 1,270 1,298 
Dilutive effect of stock options and equivalents6 7 10 
Shares used in per share calculation - diluted 1,263 1,277 1,308 
Net income per share attributable to Gilead common stockholders - basic$0.10 $4.24 $4.20 
Net income per share attributable to Gilead common stockholders - diluted$0.10 $4.22 $4.17