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Stock Compensation Plans (Tables)
 6 Months Ended
Jun. 30, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Stock-based Compensation Expense Stock-based compensation expense for the following periods were:
In millions
Three months ended June 30
 
Six months ended June 30
2019
 
2018
 
2019
 
2018
Restricted stock units
$
22

 
$
24

 
$
42

 
$
37

Stock options
2

 
1

 
4

 
1

Employee stock purchase plan
1

 
1

 
2

 
2

Stock-based compensation expense
25

 
26

 
48

 
40

Tax benefit
(4
)
 
(4)

 
(7
)
 
(7
)
Total stock-based compensation expense (net of tax)
$
21

 
$
22

 
$
41

 
$
33
Schedule of Valuation Assumptions Used To Estimate Fair Value of Stock Options he Company granted stock options and the weighted average fair value of option grants was estimated based on the below weighted average assumptions, which was $8.07 and $9.80 for the six months ended June 30, 2019 and 2018, respectively. The stock options that were granted for the six months ended June 30, 2019 and 2018 had a seven year contractual term and will vest over four years.

 
Six months ended June 30
 
2019
 
2018
Dividend yield
$
—

 
$
—

Risk-free interest rate
2.50
%
 
2.50
%
Expected volatility
34.79
%
 
34.80
%
Expected holding period (years)
3.9

 
3.8


E