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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of stock option activity
The following table summarizes the stock option activity for the nine months ended September 30, 2014:
 
 
Number of
Shares (in millions)
 
Weighted Average
Exercise
Price per Share
 
Weighted Average
Remaining
Contractual Term
(years)
 
Aggregate
Intrinsic
Value
(in millions)
Outstanding as of December 31, 2013
10.5

 
$
28.91

 
 
 
 
Granted
0.5

 
33.76

 
 
 
 
Exercised
(2.8
)
 
27.96

 
 
 
$
21.4

Forfeited or expired
(0.3
)
 
30.85

 
 
 
 
Outstanding as of September 30, 2014
7.9

 
$
29.48

 
4.0
 
$
74.7

Exercisable as of September 30, 2014
3.9

 
$
28.05

 
3.1
 
$
42.3

Restricted stock unit and restricted stock activity
The following table summarizes restricted stock unit and restricted stock activity for the nine months ended September 30, 2014: 

 
Number of
Restricted Stock
Units and Shares of
Restricted Stock
(in thousands)
 
Weighted Average
Grant Date Fair
Value per Share
 
Weighted Average
Remaining
Contractual Term
(years)
 
Aggregate
Intrinsic
Value
(in millions)
Other stock awards as of December 31, 2013
997.0

 
$
28.48

 
 
 
 
Granted
771.4

 
33.39

 
 
 
 
Vested and issued
(255.2
)
 
28.60

 
 
 
 
Forfeited
(66.8
)
 
32.91

 
 
 
 
Other stock awards as of September 30, 2014
1,446.4

 
$
24.01

 
1.2
 
$
56.4

Vested and unissued as of September 30, 2014
567.0

 
$
39.91