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SHARE-BASED COMPENSATION (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Additional Information on RSUs
The following table provides additional information on RSUs for the last three fiscal years:
 
2018
 
2017
 
2016
Share-based compensation expense (in millions)
$
170

 
$
172

 
$
204

Weighted average grant-date fair value (per RSU)
$
132

 
$
85

 
$
66

Aggregate intrinsic value of distributed RSUs (in millions)
$
294

 
$
322

 
$
190
Changes in Outstanding RSU Grants

The following table presents the changes in our outstanding RSUs, including PSUs, during 2018 and the associated weighted average grant-date fair values:
 
Number of RSUs
(in millions)
 
Weighted Average 
Grant-Date
Fair Value
(per RSU)
Outstanding at year-end 2017
5.6

 
$
71

Granted
1.5

 
132

Distributed
(2.1
)
 
69

Forfeited
(0.2
)
 
93

Outstanding at year-end 2018
4.8

 
$
90