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Stock Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2016
Stock Compensation Plans [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
Stock-based compensation expense for the following periods were:
In millions
Three months ended June 30
 
Six months ended June 30
2016
 
2015
 
2016
 
2015
Restricted stock units
$
16

 
$
11

 
$
29

 
$
20

Tax benefit
(4)

 
(3)

 
(8
)
 
(6
)
Total stock-based compensation (net of tax)
$
12

 
$
8

 
$
21

 
$
14