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Stock-Based Compensation
6 Months Ended
Jun. 30, 2017
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 June 30 is as follows:
(in millions)
Three Months
 
Six Months
 
2017
 
2016
 
2017
 
2016
Stock option expense
$

 
$
2

 
$
2

 
$
4

Restricted stock and unit awards expense
21

 
18

 
39

 
30

Total stock-based compensation expense 
$
21

 
$
20

 
$
41

 
$
34



During the six months ended June 30, 2017, the Company granted 0.4 million shares of restricted stock and unit awards, which had a weighted average grant date fair value of $129.47 per share. Total unrecognized compensation expense related to unvested restricted stock and unit awards as of June 30, 2017 was $88 million, which is expected to be recognized over a weighted average period of 1.9 years.