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Net Income Per Share Attributable to Gilead Common Shareholders (Tables)
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
 
 
Year Ended December 31,
 
 
2017
 
2016
 
2015
Net income attributable to Gilead
 
$
4,628

 
$
13,501

 
$
18,108

Shares used in per share calculation - basic
 
1,307

 
1,339

 
1,464

Effect of dilutive securities:
 
 
 
 
 
 
Stock options and equivalents
 
12

 
13

 
23

Conversion spread related to the Convertible Notes
 
—

 
2

 
14

Warrants related to the Convertible Notes
 
—

 
4

 
20

Shares used in per share calculation - diluted
 
1,319

 
1,358

 
1,521

Net income per share attributable to Gilead common stockholders - basic
 
$
3.54

 
$
10.08

 
$
12.37

Net income per share attributable to Gilead common stockholders - diluted
 
$
3.51

 
$
9.94

 
$
11.91