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Stockbased Compensation Expense (Tables)
12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement [Abstract]  
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: 
202120202019
Expected stock price volatility
26 %22 %21 %
Risk free interest rate
0.8 %1.1 %2.4 %
Expected life of options (years)
4.34.34.3
Expected annual dividend
0.2 %0.3 %0.3 %
Share-based Payment Arrangement, Option, Activity [Table Text Block] A summary of the company’s option activity for the year ended December 31, 2021 is presented below:
Shares
(in millions)
Weighted average exercise priceWeighted average remaining contractual term
(in years)
Aggregate intrinsic
value
(in millions)
Outstanding at December 31, 2020
5.9 $221.22 
Granted
1.5 552.26 
Issued in connection with an acquisition
0.2 492.35 
Exercised
(1.4)183.63 
Canceled/expired
(0.2)341.83 
Outstanding at December 31, 2021
6.0 $319.95 4.5$2,094 
Vested and unvested expected to vest at December 31, 2021
5.7 $306.64 4.3$2,035 
Exercisable at December 31, 2021
2.8 $193.39 2.9$1,307 
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, 2021 is presented below:
Shares
(in millions)
Weighted average exercise priceWeighted average remaining contractual term
(in years)
Aggregate intrinsic
value
(in millions)
Outstanding at December 31, 2020
5.9 $221.22 
Granted
1.5 552.26 
Issued in connection with an acquisition
0.2 492.35 
Exercised
(1.4)183.63 
Canceled/expired
(0.2)341.83 
Outstanding at December 31, 2021
6.0 $319.95 4.5$2,094 
Vested and unvested expected to vest at December 31, 2021
5.7 $306.64 4.3$2,035 
Exercisable at December 31, 2021
2.8 $193.39 2.9$1,307 
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, 2021 is presented below:
 Units
(in millions)
Weighted
average
grant-date
fair value
Unvested at December 31, 2020
0.8 $276.74 
Granted
0.4 444.61 
Issued in connection with an acquisition
0.2 628.71 
Vested
(0.5)295.70 
Forfeited
(0.1)326.90 
Unvested at December 31, 2021
0.8 $425.39