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Net Income Per Share Attributable to Gilead Common Shareholders
 12 Months Ended
Dec. 31, 2017
Earnings Per Share [Abstract]  
Earnings Per Share
NET INCOME PER SHARE ATTRIBUTABLE TO GILEAD COMMON STOCKHOLDERS
Basic net income per share attributable to Gilead common stockholders is calculated based on the weighted-average number of shares of our common stock outstanding during the period. Diluted net income per share attributable to Gilead common stockholders is calculated based on the weighted-average number of shares of our common stock outstanding and other dilutive securities outstanding during the period. The potentially dilutive shares of our common stock resulting from the assumed exercise of outstanding stock options and equivalents, the assumed conversion of our outstanding Convertible Notes and the assumed exercise of the warrants related to our outstanding Convertible Notes were determined under the treasury stock method. Both the Convertible Notes and the associated warrants were settled in 2016.
We excluded stock options and equivalents of approximately 11 million, 3 million and 1 million weighted-average shares of our common stock that were outstanding during 2017, 2016 and 2015, respectively, in the computation of diluted net income per share attributable to Gilead common stockholders because their effect was antidilutive.
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,
 
 
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