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Net Income Per Share Attributable to Gilead Common Stockholders (Tables)
 9 Months Ended
Sep. 30, 2018
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
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2018
 
2017
 
2018
 
2017
Net income attributable to Gilead
 
$
2,097

 
$
2,718

 
$
5,452

 
$
8,493

Shares used in per share calculation - basic
 
1,296

 
1,306

 
1,302

 
1,307

Dilutive effect of stock options and equivalents
 
11

 
13

 
11

 
12

Shares used in per share calculation - diluted
 
1,307

 
1,319

 
1,313

 
1,319

Net income per share attributable to Gilead common stockholders - basic
 
$
1.62

 
$
2.08

 
$
4.19

 
$
6.50

Net income per share attributable to Gilead common stockholders - diluted
 
$
1.60

 
$
2.06

 
$
4.15

 
$
6.44