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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2014
Equity [Abstract]  
Nonvested Restricted Stock Units Activity
The following table summarizes our restricted stock unit activity (in millions):
 
 
Number of Units
 
Weighted Average
Grant-Date
Fair Value
Outstanding as of January 1, 2012
13.1

 
$
143

Units granted
8.2

 
209

Units vested
(4.2
)
 
110

Units forfeited
(1.7
)
 
168

Outstanding as of December 31, 2012
15.4

 
184

Units granted
7.2

 
283

Units vested
(4.5
)
 
160

Units forfeited
(1.8
)
 
209

Outstanding as of December 31, 2013
16.3

 
233

Units granted
8.5

 
328

Units vested
(5.1
)
 
202

Units forfeited
(2.3
)
 
264

Outstanding as of December 31, 2014
17.4

 
$
285
Nonvested Share Activity
Scheduled vesting for outstanding restricted stock units as of December 31, 2014, is as follows (in millions):
 

 
Year Ended December 31,
 
 
 
 
 
2015
 
2016
 
2017
 
2018
 
2019
 
Thereafter
 
Total
Scheduled vesting—restricted stock units
5.9

 
6.1

 
3.4

 
1.7

 
0.2

 
0.1

 
17.4