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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2011
14.0

 
$
96

Units granted
5.4

 
193

Units vested
(5.1
)
 
73

Units forfeited
(1.2
)
 
122

Outstanding as of December 31, 2011
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
Nonvested Share Activity
Scheduled vesting for outstanding restricted stock units as of December 31, 2013, is as follows (in millions):
 

 
Year Ended December 31,
 
 
 
 
 
2014
 
2015
 
2016
 
2017
 
2018
 
Thereafter
 
Total
Scheduled vesting—restricted stock units
5.4

 
5.8

 
3.2

 
1.6

 
0.2

 
0.1

 
16.3