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Stock Compensation Plans (Tables)
 9 Months Ended
Sep. 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 expenses for the following periods were:
In millions
Three months ended September 30
 
Nine months ended September 30
2016
 
2015
 
2016
 
2015
Restricted stock units
$
16

 
$
12

 
$
45

 
$
32

Tax benefit
(6)

 
(4)

 
(14
)
 
(10
)
Total stock-based compensation (net of tax)
$
10

 
$
8

 
$
31

 
$
22
Disclosure of Share-based Compensation Arrangements by Share-based Payment Award
The weighted-average assumptions used and the resulting estimates of fair value were as follows:
 
Nine months ended September 30, 2016
Expected volatility
33.9%
Expected dividend yield
—
Risk-free rate
1.21%
Weighted average fair value per share
$14.93