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Stock Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 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 March 31, 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 March 31
2014
 
2013
Restricted stock
$10
 
$9
Stock options
—
 
1
Total stock-based compensation (pre-tax)
10
 
10
Tax benefit
(4)
 
(3)
Total stock-based compensation (net of tax)
$6
 
$7