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Stock Compensation Plans (Tables)
 9 Months Ended
Sep. 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 September 30
 
Nine months ended September 30
2019
 
2018
 
2019
 
2018
Restricted stock units
$
25

 
$
13

 
$
67

 
$
50

Stock options
2

 
1

 
6

 
2

Employee stock purchase plan
1

 
1

 
3

 
3

Stock-based compensation expense
28

 
15

 
76

 
55

Tax benefit
(5
)
 
—

 
(12
)
 
(7
)
Total stock-based compensation expense (net of tax)
$
23

 
$
15

 
$
64

 
$
48
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 nine months ended September 30, 2019 and 2018, respectively. The stock options that were granted for the nine months ended September 30, 2019 and 2018 had a seven year contractual term and will vest over four years.

 
Nine months ended September 30
 
2019
 
2018
Dividend yield
$
—

 
$
—

Risk-free interest rate
2.50
%
 
2.50
%
Expected volatility
34.79
%
 
34.88
%
Expected holding period (years)
3.9

 
3.8


E