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Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2015
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, 2013
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

Units granted
9.8

 
426

Units vested
(5.6
)
 
253

Units forfeited
(2.7
)
 
321

Outstanding as of December 31, 2015
18.9

 
$
362
Nonvested Share Activity
Scheduled vesting for outstanding restricted stock units as of December 31, 2015, is as follows (in millions):
 

 
Year Ended December 31,
 
 
 
 
 
2016
 
2017
 
2018
 
2019
 
2020
 
Thereafter
 
Total
Scheduled vesting—restricted stock units
6.4

 
7.0

 
3.6

 
1.6

 
0.1

 
0.2

 
18.9