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Stock Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Stock Compensation Plans [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
Stock-based compensation expenses for the following periods were:
In millions
Three months ended June 30
 
Six months ended June 30
2017
 
2016
 
2017
 
2016
Restricted stock units
$
21

 
$
16

 
$
39

 
$
29

Employee stock purchase plan
1

 
—

 
2

 
—

Stock-based compensation expense
22

 
16

 
41

 
29

Tax benefit
(6)

 
(4)

 
(12)

 
(8
)
Total stock-based compensation expense (net of tax)
$
16

 
$
12

 
$
29

 
$
21