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Net Income Per Share Attributable to Gilead Common Shareholders (Tables)
 12 Months Ended
Dec. 31, 2018
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,
 
 
2018
 
2017
 
2016
Net income attributable to Gilead
 
$
5,455

 
$
4,628

 
$
13,501

Shares used in per share calculation - basic
 
1,298

 
1,307

 
1,339

Effect of dilutive securities:
 
 
 
 
 
 
Stock options and equivalents
 
10

 
12

 
13

Conversion spread related to the Convertible Notes
 
—

 
—

 
2

Warrants related to the Convertible Notes
 
—

 
—

 
4

Shares used in per share calculation - diluted
 
1,308

 
1,319

 
1,358

Net income per share attributable to Gilead common stockholders - basic
 
$
4.20

 
$
3.54

 
$
10.08

Net income per share attributable to Gilead common stockholders - diluted
 
$
4.17

 
$
3.51

 
$
9.94