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Stockbased Compensation Expense (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Share-based Payment Arrangement, Cost by Plan [Table Text Block] tock-based compensation expense is primarily included in selling, general and administrative expenses.
(In millions)201920182017
Stock-based Compensation Expense
$181  $181  $159  
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: 
201920182017
Expected Stock Price Volatility
21 %20 %20 %
Risk Free Interest Rate
2.4 %2.6 %1.9 %
Expected Life of Options (years)
4.34.34.3
Expected Annual Dividend
0.3 %0.3 %0.4 %
Share-based Payment Arrangement, Option, Activity [Table Text Block]
A summary of the company’s option activity for the year ended December 31, 2019 is presented below:
Shares
(in millions)		Weighted Average Exercise PriceWeighted Average Remaining Contractual Term
(in years)		Aggregate Intrinsic
Value (a)
(in millions)
Outstanding at December 31, 2018
8.0  $148.09  
Granted
1.3  256.61  
Exercised
(2.0) 111.13  
Canceled/Expired
(0.4) 193.78  
Outstanding at December 31, 2019
6.9  $176.26  4.1
Vested and Unvested Expected to Vest at December 31, 2019
6.6  $174.33  4.1$992  
Exercisable at December 31, 2019
3.1  $141.20  2.9$561  
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, 2019 is presented below:
Shares
(in millions)		Weighted Average Exercise PriceWeighted Average Remaining Contractual Term
(in years)		Aggregate Intrinsic
Value (a)
(in millions)
Outstanding at December 31, 2018
8.0  $148.09  
Granted
1.3  256.61  
Exercised
(2.0) 111.13  
Canceled/Expired
(0.4) 193.78  
Outstanding at December 31, 2019
6.9  $176.26  4.1
Vested and Unvested Expected to Vest at December 31, 2019
6.6  $174.33  4.1$992  
Exercisable at December 31, 2019
3.1  $141.20  2.9$561  
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block]
A summary of the company’s restricted unit activity for the year ended December 31, 2019 is presented below:
 Units
(in millions)		Weighted
Average
Grant-Date
Fair Value
Unvested at December 31, 2018
1.2  $177.04  
Granted
0.6  248.10  
Vested
(0.7) 173.61  
Forfeited
(0.1) 198.73  
Unvested at December 31, 2019
1.0  $218.34