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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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, 2020 | 1,498 |  |  | $ | 100.74 |  |  |  |  |
Exercised | (375) |  |  | 92.76 |  |  |  |  |
Granted | 441 |  |  | 104.10 |  |  |  |  |
Forfeited / Expired | — |  |  | — |  |  |  |  |
Outstanding at December 31, 2020 | 1,564 |  |  | $ | 103.60 |  |  | 6.84 |  | $ | 101 |
Options Vested and Expected to Vest | 1,564 |  |  | $ | 103.60 |  |  | 6.84 |  | $ | 101 |
Exercisable at December 31, 2020 | 801 |  |  | $ | 101.33 |  |  | 5.46 |  | $ | 54 |
Share-based Payment Arrangement, Restricted Stock Unit, Activity [Table Text Block] | As of December 31, 2020, we had the following outstanding Restricted Units, including reinvested dividends, granted under the MIP:
| Restricted Units (in thousands) |  | Weighted-Average Grant Date Fair Value |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in millions)
Non-vested as of January 1, 2020 | 10,739 |  |  | $ | 106.94 |  |  |  |  |
Vested | (12,195) |  |  | 106.60 |  |  |  |  |
Granted | 3,638 |  |  | 102.54 |  |  |  |  |
Reinvested Dividends | 276 |  |  | N/A |  |  |  |
Forfeited / Expired | (165) |  |  | 101.80 |  |  |  |  |
Non-vested as of December 31, 2020 | 2,293 |  |  | $ | 102.91 |  |  | 0.26 |  | $ | 386 |
Share-based Payment Arrangement, Performance Shares, Outstanding Activity [Table Text Block] | As of December 31, 2020, we had the following Restricted Units outstanding, including reinvested dividends, that were granted under our LTIP program:
| Restricted Units (in thousands) |  | Weighted-Average Grant Date Fair Value |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in millions)
Non-vested as of January 1, 2020 | 1,691 |  |  | $ | 109.18 |  |  |  |  |
Vested | (867) |  |  | 110.79 |  |  |  |  |
Granted | 230 |  |  | 92.76 |  |  |  |  |
Reinvested Dividends | 64 |  |  | N/A |  |  |  |
Forfeited / Expired | (114) |  |  | 107.34 |  |  |  |  |
Non-vested as of December 31, 2020 | 1,004 |  |  | $ | 104.15 |  |  | 1.22 |  | $ | 169 |
Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block] | The following table summarizes information about stock options outstanding and exercisable as of December 31, 2020:
| Options Outstanding |  | Options Exercisable
Exercise Price Range | Options (in thousands) |  | Weighted-Average Remaining Contractual Term (in years) |  | Weighted-Average Exercise Price |  | Options (in thousands) |  | Weighted-Average Exercise Price
$65.01 - $80.00 | 67 |  |  | 0.90 |  | $ | 76.02 |  |  | 67 |  |  | $ | 76.02 |
$80.01 - $95.00 | 46 |  |  | 2.17 |  | 82.87 |  |  | 46 |  |  | 82.87 |
$95.01 - $110.00 | 1,208 |  |  | 7.09 |  | 104.28 |  |  | 587 |  |  | 103.87 |
$110.01 - $125.00 | 243 |  |  | 8.12 |  | 111.80 |  |  | 101 |  |  | 111.80 |
| 1,564 |  |  | 6.84 |  | $ | 103.60 |  |  | 801 |  |  | $ | 101.33 |
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
| 2020 |  | 2019 |  | 2018
Risk-free interest rate | 0.15 | % |  | 2.23 | % |  | 2.61 | %
Expected volatility | 27.53 | % |  | 19.64 | % |  | 16.51 | %
Weighted-average fair value of units granted | $ | 92.77 |  |  | $ | 123.44 |  |  | $ | 137.57 |
Share payout | 101.00 | % |  | 115.04 | % |  | 123.47 | %
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:
| 2020 |  | 2019 |  | 2018
Expected dividend yield | 3.51 | % |  | 2.94 | % |  | 2.93 | %
Risk-free interest rate | 1.26 | % |  | 2.60 | % |  | 2.84 | %
Expected life in years | 7.5 |  | 7.5 |  | 7.5
Expected volatility | 19.25 | % |  | 17.79 | % |  | 16.72 | %
Weighted-average fair value of options granted | $ | 11.74 |  |  | $ | 16.34 |  |  | $ | 15.23 |

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- Definition Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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