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Net Income Per Share Attributable to Gilead Common Shareholders (Tables)
 12 Months Ended
Dec. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table shows the calculation of basic and diluted net income per share attributable to Gilead common stockholders (in millions, except per share amounts):
 
 
Year Ended December 31,
 
 
2019
 
2018
 
2017
Net income attributable to Gilead
 
$
5,386

 
$
5,455

 
$
4,628

Shares used in per share calculation - basic
 
1,270

 
1,298

 
1,307

Dilutive effect of stock options and equivalents
 
7

 
10

 
12

Shares used in per share calculation - diluted
 
1,277

 
1,308

 
1,319

Net income per share attributable to Gilead common stockholders - basic
 
$
4.24

 
$
4.20

 
$
3.54

Net income per share attributable to Gilead common stockholders - diluted
 
$
4.22

 
$
4.17

 
$
3.51