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Equity Compensation Plans (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Schedule of Equity-Based Compensation Expense The following table details the components of equity-based compensation expense recognized in net earnings in each of the past three years:
Year Ended December 31
2019
 
2018
 
2017
Stock options
$
43

 
$
45

 
$
34

Restricted stock/RSUs
62

 
65

 
46

Total equity-based compensation expense, net of tax
$
105

 
$
110

 
$
80
Schedule of Assumptions Of Fair Value Options On The Date Of Grant Using Black-Scholes Option Pricing Model We estimate the fair value of stock options on the date of grant using the Black-Scholes option pricing model with the following assumptions for each of the past three years:
Year Ended December 31
2019
 
2018
 
2017
Expected volatility
19.7-20.0%

 
17.6-18.2%

 
17.3-19.4%

Weighted average expected volatility
19.7
%
 
17.6
%
 
19.4
%
Expected term (in months)
64

 
68

 
68

Risk-free interest rate
1.7-2.6%

 
2.6-2.9%

 
2.0-2.2%

Expected dividend yield
2.0
%
 
1.8
%
 
1.8
%
Schedule of Stock Option Activity
A summary of stock option activity during 2019 follows:
In Shares and Dollars
Shares Under Option 
 
Weighted Average
Exercise Price Per Share
Outstanding on December 31, 2018
10,765,195

 
$
143.43

Granted
2,115,740

 
167.92

Exercised
(2,757,815
)
 
91.34

Forfeited/canceled
(355,371
)
 
195.59

Outstanding on December 31, 2019
9,767,749

 
$
161.54

Vested and expected to vest on December 31, 2019
9,538,150

 
$
161.10

Exercisable on December 31, 2019
5,484,562

 
$
137.92
Schedule of Stock Options' Intrinsic Value And Remaining Contractual Term
Summary information with respect to our stock options’ intrinsic value and remaining contractual term on December 31, 2019, follows:
 
Weighted Average  Remaining Contractual Term (in years)
 
Aggregate Intrinsic
Value
Outstanding
6.4
 
$
242

Vested and expected to vest
6.4
 
241

Exercisable
4.8
 
225
Schedule of Restricted Stock And Restricted Stock Unit Activity
A summary of restricted stock and RSU activity during 2019 follows:
In Shares and Dollars
Shares/
Share-Equivalent 
Units
 
Weighted Average
Grant-Date Fair Value Per Share
Nonvested at December 31, 2018
1,262,276

 
$
171.62

Granted
556,922

 
161.43

Vested
(541,997
)
 
138.73

Forfeited
(52,837
)
 
183.81

Nonvested at December 31, 2019
1,224,364

 
$
181.11