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SHARE-BASED COMPENSATION (Tables)
 6 Months Ended
Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of the components and classification of share-based compensation expense
The following table summarizes the components and classification of share-based compensation expense related to stock options and RSUs for the three and six months ended June 30, 2017 and 2016:
 
Three Months Ended
June 30,

Six Months Ended
June 30,
(in millions)
2017

2016

2017

2016
Stock options
$
5

 
$
4

 
$
10

 
$
7

RSUs
18

 
29

 
41

 
90

 
$
23

 
$
33

 
$
51

 
$
97

 
 
 
 
 
 
 
 
Research and development expenses
$
2

 
$
1

 
$
4

 
$
3

Selling, general and administrative expenses
21

 
32

 
47

 
94

 
$
23

 
$
33

 
$
51

 
$
97