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Stock Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2014
Share Based Compensation (Tables) [Abstract]  
Stock Based Compensation Expense
The components of stock-based compensation expense for the three and six months ended June 30, 2014 and 2013 are presented below (in millions):
 
For the Three Months Ended June 30,
 
For the Six Months Ended June 30,
 
2014
 
2013
 
2014
 
2013
Total stock-based compensation expense
$
11

 
$
10

 
$
22

 
$
19

Income tax benefit recognized in the income statement
(4
)
 
(3
)
 
(8
)
 
(6
)
Stock-based compensation expense, net of tax
$
7

 
$
7

 
$
14

 
$
13
Schedule of Share-based Compensation, Stock Options, Activity
The table below summarizes stock option activity for the six months ended June 30, 2014:
 
Stock Options
 
Weighted Average Exercise Price
 
Weighted Average Remaining Contractual Term (Years)
 
Aggregate Intrinsic Value (in millions)
Outstanding as of January 1, 2014
2,031,833

 
$
37.59

 
7.65
 
$
23

Granted
667,139

 
51.68

 
 
 
 
Exercised
(802,729
)
 
34.81

 
 
 
14

Forfeited or expired
—

 
—

 
 
 
 
Outstanding as of June 30, 2014
1,896,243

 
43.72

 
8.35
 
28

Exercisable as of June 30, 2014
639,671

 
37.53

 
7.10
 
13
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity
The table below summarizes RSU activity for the six months ended June 30, 2014. The fair value of restricted stock units is determined based on the number of units granted and the grant date price of the Company's common stock.
 
RSUs
 
Weighted Average Grant Date Fair Value
 
Weighted Average Remaining Contractual Term (Years)
 
Aggregate Intrinsic Value (in millions)
Outstanding as of January 1, 2014
2,139,143

 
$
39.15

 
1.12
 
$
104

Granted
583,303

 
51.68

 
 
 
 
Vested and released
(722,821
)
 
36.49

 
 
 
38

Forfeited
(39,701
)
 
42.57

 
 
 
 
Outstanding as of June 30, 2014
1,959,924

 
43.79

 
1.57
 
115
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block]
The table below summarizes PSU activity for the six months ended June 30, 2014. The fair value of performance share units is determined based on the number of units granted and the grant date price of the Company's common stock.
 
PSUs
 
Weighted Average Grant Date Fair Value
 
Weighted Average Remaining Contractual Term (Years)
 
Aggregate Intrinsic Value (in millions)
Outstanding as of January 1, 2014
422,866

 
$
39.88

 
1.26
 
$
21

Granted
149,727

 
51.68

 
 
 
 
Vested and released
(104,165
)
 
36.42

 
 
 
5

Forfeited
(23,014
)
 
36.42

 
 
 
 
Outstanding as of June 30, 2014
445,414

 
44.83

 
1.56
 
26