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Stock Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2014
Stock Compensation Plans [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
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