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Stock Compensation Plans
6 Months Ended
Jun. 30, 2014
Stock Compensation Plans [Abstract]  
Stock Compensation Plans
7. STOCK COMPENSATION PLANS

As of June 30, 2014, the Company’s primary types of stock-based compensation were restricted stock and stock options. Stock-based compensation expense for the following periods was:
In millions
Three months ended June 30
 
Six months ended June 30
2014
 
2013
 
2014
 
2013
Restricted stock
$9
 
$12
 
$19
 
$21
Stock options
 
 
 
1
Total stock-based compensation (pre-tax)
9
 
12
 
19
 
22
Tax benefit
(2)
 
(4)
 
(6)
 
(7)
Total stock-based compensation (net of tax)
$7
 
$8
 
$13
 
$15


Stock-based compensation expense is recognized in the financial statements based upon fair value. During the three and six months ended June 30, 2014 and 2013, the Company did not grant any stock options. As of June 30, 2014, the total unrecognized compensation cost of $83 million related to unvested restricted stock grants is expected to be recognized over a weighted average period of approximately 1.3 years.