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Stock Compensation Plans (Tables)
 3 Months Ended
Mar. 31, 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 March 31
2017
 
2016
Restricted stock units
$
18

 
$
13

Employee stock purchase plan
1

 
—

Stock-based compensation expense
19

 
13

Tax benefit
(6)

 
(4)

Total stock-based compensation expense (net of tax)
$
13

 
$
9