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STOCK-BASED COMPENSATION (Tables)
12 Months Ended
Dec. 31, 2021
Share-based Payment Arrangement, Noncash Expense [Abstract]  
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] As of December 31, 2021, we had the following outstanding RPUs, including reinvested dividends, granted under the MIP:
RPUs
(in thousands)
Weighted-Average
Grant Date
Fair Value
Non-vested as of January 1, 20212,293 $102.91 
Vested(5,452)109.35 
Granted6,618 165.27 
Reinvested Dividends129 N/A
Forfeited / Expired(121)159.78 
Non-vested as of December 31, 20213,467 $163.32 
Schedule of Share-based Payment Award, Performance Units, Valuation Assumptions [Table Text Block]
The weighted-average assumptions used in our Monte Carlo models for each award year were as follows:
202120202019
Risk-free interest rate0.19 %0.15 %2.23 %
Expected volatility30.70 %27.53 %19.64 %
Weighted-average fair value of units granted$168.05 $92.77 $123.44 
Share payout102.39 %101.00 %115.04 %
Share-based Payment Arrangement, Performance Shares, Outstanding Activity [Table Text Block] As of December 31, 2021, we had the following RPUs outstanding, including reinvested dividends, that were granted under our LTIP program:
RPUs
(in thousands)
Weighted-Average
Grant Date
Fair Value
Non-vested as of January 1, 20211,004 $104.15 
Vested(919)115.40 
Granted1,659 168.10 
Reinvested Dividends50 N/A
Forfeited / Expired(158)149.90 
Non-vested as of December 31, 20211,636 $159.34 
Share-based Payment Arrangement, Option, Activity [Table Text Block] The following is an analysis of options to purchase shares of class A common stock issued and outstanding:
Options
(in thousands)
Weighted-Average
Exercise
Price
Weighted-Average  Remaining
Contractual Term
(in years)
Aggregate Intrinsic
Value (in millions)
Outstanding at January 1, 20211,564 $103.60 
Exercised(176)99.74 
Granted211 165.58 
Forfeited / Expired— — 
Outstanding as of December 31, 20211,599 $112.18 6.46$163 
Options Vested and Expected to Vest1,599 $112.18 6.46$163 
Exercisable as of December 31, 20211,050 $104.15 5.52$116 
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
The fair value of each option grant is estimated using the Black-Scholes option pricing model. The weighted-average assumptions used by year, and the calculated weighted-average fair values of options, are as follows:
202120202019
Expected dividend yield3.31 %3.51 %2.94 %
Risk-free interest rate0.84 %1.26 %2.60 %
Expected life in years7.57.57.5
Expected volatility23.15 %19.25 %17.79 %
Weighted-average fair value of options granted$23.71 $11.74 $16.34