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Stockbased Compensation Expense (Tables)
 12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan [Table Text Block]
The components of stock-based compensation expense are primarily included in selling, general and administrative expenses and are as follows:
(In millions)
 
2018

 
2017

 
2016

 
 
 
 
 
 
 
Stock Option Awards
 
$
57

 
$
53

 
$
41

Restricted Unit Awards
 
124

 
106

 
92

 
 
 
 
 
 
 
Total Stock-based Compensation Expense
 
$
181

 
$
159

 
$
133
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The weighted average assumptions used in the Black-Scholes option pricing model are as follows: 
 
 
2018

 
2017

 
2016

 
 
 
 
 
 
 
Expected Stock Price Volatility
 
20
%
 
20
%
 
21
%
Risk Free Interest Rate
 
2.6
%
 
1.9
%
 
1.2
%
Expected Life of Options (years)
 
4.3

 
4.3

 
4.3

Expected Annual Dividend
 
0.3
%
 
0.4
%
 
0.5
%
Share-based Compensation, Stock Options, Activity [Table Text Block]
A summary of the company’s option activity for the year ended December 31, 2018 is presented below:
 
 
Shares
(in millions)

 
Weighted Average Exercise Price

 
Weighted Average Remaining Contractual Term
(in years)
 
Aggregate Intrinsic
Value (a)
(in millions)

 
 
 
 
 
 
 
 
 
Outstanding at December 31, 2017
 
9.0

 
$
121.78

 
 
 
 
Granted
 
1.6

 
211.38

 
 
 
 
Exercised
 
(2.3
)
 
86.88

 
 
 
 
Canceled/Expired
 
(0.3
)
 
164.58

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Outstanding at December 31, 2018
 
8.0

 
$
148.09

 
4.2
 
 
 
 
 
 
 
 
 
 
 
Vested and Unvested Expected to Vest at December 31, 2018
 
7.7

 
$
146.24

 
4.2
 
$
595

 
 
 
 
 
 
 
 
 
Exercisable at December 31, 2018
 
3.5

 
$
114.93

 
2.8
 
$
382

(a)
Market price per share on December 31, 2018 was $223.79. The intrinsic value is zero for options with exercise prices above the market price.
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding and Exercisable [Table Text Block]
A summary of the company’s option activity for the year ended December 31, 2018 is presented below:
 
 
Shares
(in millions)

 
Weighted Average Exercise Price

 
Weighted Average Remaining Contractual Term
(in years)
 
Aggregate Intrinsic
Value (a)
(in millions)

 
 
 
 
 
 
 
 
 
Outstanding at December 31, 2017
 
9.0

 
$
121.78

 
 
 
 
Granted
 
1.6

 
211.38

 
 
 
 
Exercised
 
(2.3
)
 
86.88

 
 
 
 
Canceled/Expired
 
(0.3
)
 
164.58

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Outstanding at December 31, 2018
 
8.0

 
$
148.09

 
4.2
 
 
 
 
 
 
 
 
 
 
 
Vested and Unvested Expected to Vest at December 31, 2018
 
7.7

 
$
146.24

 
4.2
 
$
595

 
 
 
 
 
 
 
 
 
Exercisable at December 31, 2018
 
3.5

 
$
114.93

 
2.8
 
$
382

(a)
Market price per share on December 31, 2018 was $223.79. The intrinsic value is zero for options with exercise prices above the market price.
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block]
A summary of the company’s restricted unit activity for the year ended December 31, 2018 is presented below:
 
 
Units
(in millions)

 
Weighted
Average
Grant-Date
Fair Value

 
 
 
 
 
Unvested at December 31, 2017
 
1.4

 
$
150.23

Granted
 
0.6

 
204.72

Vested
 
(0.7
)
 
150.28

Forfeited
 
(0.1
)
 
166.95

 
 
 
 
 
Unvested at December 31, 2018
 
1.2

 
$
177.04