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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Share-based Compensation, Stock Options, Activity [Table Text Block] | The following is an analysis of options to purchase shares of class A common stock issued and outstanding:
| Shares (in thousands) |  | Weighted-Average Exercise Price |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in millions)
Outstanding at January 1, 2018 | 1,291 |  |  | $ | 91.58 |  |  |  |  |
Exercised | (178 | ) |  | 84.79 |  |  |  |  |
Granted | 279 |  |  | 106.38 |  |  |  |  |
Forfeited / Expired | (8 | ) |  | 104.87 |  |  |  |  |
Outstanding at December 31, 2018 | 1,384 |  |  | $ | 95.36 |  |  | 6.28 |  | $ | 9 |
Options Vested and Expected to Vest | 1,384 |  |  | $ | 95.36 |  |  | 6.28 |  | $ | 9 |
Exercisable at December 31, 2018 | 857 |  |  | $ | 89.36 |  |  | 5.05 |  | $ | 9 |
Schedule of Share-based Compensation, Restricted Stock Units Award Activity [Table Text Block] | As of December 31, 2018, we had the following Restricted Units outstanding, including reinvested dividends, that were granted under our Management Incentive Award program and the Coyote Restricted Stock Award:
| Shares (in thousands) |  | Weighted-Average Grant Date Fair Value |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in millions)
Nonvested at January 1, 2018 | 10,471 |  |  | $ | 99.16 |  |  |  |  |
Vested | (5,197 | ) |  | 97.33 |  |  |  |  |
Granted | 4,734 |  |  | 110.95 |  |  |  |  |
Reinvested Dividends | 352 |  |  | N/A |  |  |  |  |
Forfeited / Expired | (221 | ) |  | 104.74 |  |  |  |  |
Nonvested at December 31, 2018 | 10,139 |  |  | $ | 104.47 |  |  | 1.41 |  | $ | 989 |
Restricted Units Expected to Vest | 10,029 |  |  | $ | 104.52 |  |  | 1.40 |  | $ | 978 |
Share-based Compensation, Performance Shares Award Outstanding Activity [Table Text Block] | As of December 31, 2018, we had the following Restricted Units outstanding, including reinvested dividends, that were granted under our Long-Term Incentive Performance Award program:
| Shares (in thousands) |  | Weighted-Average Grant Date Fair Value |  | Weighted-Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in millions)
Nonvested at January 1, 2018 | 1,787 |  |  | $ | 105.58 |  |  |  |  |
Vested | (912 | ) |  | 105.60 |  |  |  |  |
Granted | 957 |  |  | 111.42 |  |  |  |  |
Reinvested Dividends | 79 |  |  | N/A |  |  |  |  |
Forfeited / Expired | (210 | ) |  | 107.98 |  |  |  |  |
Nonvested at December 31, 2018 | 1,701 |  |  | $ | 108.63 |  |  | 1.49 |  | $ | 166 |
Restricted Units Expected to Vest | 1,631 |  |  | $ | 108.64 |  |  | 1.50 |  | $ | 159 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range [Table Text Block] | The following table summarizes information about stock options outstanding and exercisable at December 31, 2018:
| Options Outstanding |  | Options Exercisable
Exercise Price Range | Shares (in thousands) |  | Weighted-Average Remaining Contractual Term (in years) |  | Weighted-Average Exercise Price |  | Shares (in thousands) |  | Weighted-Average Exercise Price
$55.01 - $70.00 | 116 |  |  | 0.88 |  | $ | 61.94 |  |  | 116 |  |  | $ | 61.94 |
$70.01 - $80.00 | 168 |  |  | 2.81 |  | 75.79 |  |  | 168 |  |  | 75.79 |
$80.01 - $90.00 | 104 |  |  | 4.17 |  | 82.89 |  |  | 104 |  |  | 82.89 |
$90.01 - $110.00 | 996 |  |  | 7.72 |  | 103.88 |  |  | 469 |  |  | 102.49 |
| 1,384 |  |  | 6.28 |  | $ | 95.36 |  |  | 857 |  |  | $ | 89.36 |
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:
| 2018 |  | 2017 |  | 2016
Expected dividend yield | 2.93 | % |  | 2.89 | % |  | 2.95 | %
Risk-free interest rate | 2.84 | % |  | 2.15 | % |  | 1.62 | %
Expected life in years | 7.5 |  |  | 7.5 |  |  | 7.5 |
Expected volatility | 16.72 | % |  | 17.81 | % |  | 22.40 | %
Weighted-average fair value of options granted | $ | 15.23 |  |  | $ | 14.70 |  |  | $ | 16.46 |
| 2018 |  | 2017 |  | 2016
Risk-free interest rate | 2.61 | % |  | 1.46 | % |  | 1.00 | %
Expected volatility | 16.51 | % |  | 16.59 | % |  | 16.46 | %
Weighted-average fair value of units granted | $ | 137.57 |  |  | $ | 119.29 |  |  | $ | 136.18 |
Share payout | 123.47 | % |  | 113.55 | % |  | 129.08 | %

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + 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 (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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=109197908&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=109197908&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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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