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Stock-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Stock-based Compensation Expense The following table summarizes the Company’s stock-based compensation expense for the twelve months ended December 31, 2019, 2018 and 2017:

In millions
 
2019
 
2018
 
2017
Pre-tax stock-based compensation expense
 
$
41

 
$
40

 
$
36

Tax benefit
 
(5
)
 
(5
)
 
(9
)
Total stock-based compensation expense, net of tax
 
$
36

 
$
35

 
$
27
Summary of Activity Related to Non-vested RSUs
The following table summarizes activity related to non-vested RSUs for the twelve months ended December 31, 2019:

Shares in millions
 
Number of
Shares
 
Weighted-Average
Grant-Date Fair Value
Unvested, January 1, 2019
 
0.5

 
$121.24
Granted
 
0.2

 
144.43
Vested
 
(0.2
)
 
87.28
Unvested, December 31, 2019
 
0.5

 
144.92
Summary of Stock Option Activity
The following table summarizes stock option activity for the twelve months ended December 31, 2019:

In millions except exercise price and contractual terms
 
Number of Shares
 
Weighted-Average
Exercise Price
 
Weighted-Average
Remaining
Contractual Term
 
Aggregate Intrinsic
Value
Under option, January 1, 2019
 
4.6

 
$90.56
 
 
 
 
Granted
 
0.5

 
144.21
 
 
 
 
Exercised
 
(1.3
)
 
64.51
 
 
 
 
Canceled or expired
 
(0.1
)
 
144.55
 
 
 
 
Under option, December 31, 2019
 
3.7

 
106.57
 
5.9
 
$271
Exercisable, December 31, 2019
 
2.4

 
89.55
 
4.8
 
$220
Summary of Assumptions Used in Option Valuations The following summarizes the assumptions used in the option valuations for the twelve months ended December 31, 2019, 2018 and 2017:

 
 
2019
 
2018
 
2017
Risk-free interest rate
 
2.50-2.68%
 
2.07-3.06%
 
0.91-2.61%
Weighted-average volatility
 
22.0%
 
22.0%
 
22.0%
Dividend yield
 
2.20%
 
2.10%
 
2.22%
Expected years until exercise
 
8.7-9.0
 
7.5-8.4
 
7.2-7.9