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Stock-Based Compensation
9 Months Ended
Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Stock-Based Compensation
Stock-Based Compensation

We issue stock-based incentive awards to our eligible employees and Directors under the 2002 Employee Stock Incentive Plan and a Director Deferred Stock Ownership Plan. The 2002 Employee Stock Incentive Plan permits the granting of nonqualified stock options, stock appreciation rights, performance stock, restricted stock and other stock-based awards.

Stock-based compensation for the periods ended September 30 is as follows:
(in millions)
Three Months
 
Nine Months
 
2014
 
2013
 
2014
 
2013
Stock option expense
$
6

 
$
4

 
$
15

 
$
9

Restricted stock and unit awards expense
20

 
21

 
57

 
61

Total stock-based compensation expense 
$
26

 
$
25

 
$
72

 
$
70



For the nine months ended September 30, 2014, the Company granted 0.8 million employee stock options, which had a weighted average grant date value of $23.39 per share based on the lattice-based option-pricing model. The Company also granted 0.7 million shares of restricted stock and unit awards, which had a weighted average grant date fair value of $77.81 per share.

Total unrecognized compensation expense related to unvested stock option awards and unvested restricted stock unit awards as of September 30, 2014 was $16 million and $88 million, respectively, which is expected to be recognized over a weighted average period of 2.3 years and 1.7 years, respectively.