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Net Income Per Share Attributable to Gilead Common Stockholders (Tables)
3 Months Ended
Mar. 31, 2019
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 (in millions, except per share amounts):
 
 
Three Months Ended
 
 
March 31,
 
 
2019
 
2018
Net income attributable to Gilead
 
$
1,975

 
$
1,538

Shares used in per share calculation - basic
 
1,276

 
1,307

Dilutive effect of stock options and equivalents
 
7

 
13

Shares used in per share calculation - diluted
 
1,283

 
1,320

Net income per share attributable to Gilead common stockholders - basic
 
$
1.55

 
$
1.18

Net income per share attributable to Gilead common stockholders - diluted
 
$
1.54

 
$
1.17