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STOCK INCENTIVE PLANS (Tables) | 12 Months Ended
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Dec. 31, 2018
STOCK INCENTIVE PLANS [Abstract] |
Activity for restricted stock units | The following table summarizes RSU activity (in millions, except for share and per share amounts):
| 2018 |  | 2017 |  | 2016
| Shares | Weighted Average Price Per Share |  | Shares | Weighted Average Price Per Share |  | Shares | Weighted Average Price Per Share
Beginning nonvested units | 352,919 |  | $ | 226.31 |  |  | 373,403 |  | $ | 221.77 |  |  | 432,783 |  | $ | 213.45 |
Issued | 141,775 |  | $ | 284.98 |  |  | 129,378 |  | $ | 222.53 |  |  | 113,909 |  | $ | 230.36 |
Canceled | (56,393 | ) | $ | 245.08 |  |  | (47,488 | ) | $ | 229.36 |  |  | (62,869 | ) | $ | 229.70 |
Vested | (94,487 | ) | $ | 233.75 |  |  | (102,374 | ) | $ | 203.51 |  |  | (110,420 | ) | $ | 193.51 |
Ending nonvested units | 343,814 |  | $ | 245.38 |  |  | 352,919 |  | $ | 226.31 |  |  | 373,403 |  | $ | 221.77 |
Fair value of shares vested | $22 |  |  | $21 |  |  | $21 |
Disclosure of Share-based Compensation, Stock Options | Transactions involving stock options are summarized as follows:
| Shares Subject to Option |  | Weighted Average Price Per Share |  | Options Exercisable
Outstanding at January 1, 2016 | 2,226,286 |  |  | $ | 169.96 |  |  | 1,411,460 |
Granted | 294,874 |  |  | $ | 234.25 |  |  |  |
Exercised | (317,110 | ) |  | $ | 108.28 |  |  |  |
Canceled or expired | (80,014 | ) |  | $ | 210.01 |  |  |  |
Outstanding at December 31, 2016 | 2,124,036 |  |  | $ | 186.59 |  |  | 1,346,707 |
Granted | 306,206 |  |  | $ | 230.97 |  |  |  |
Exercised | (409,269 | ) |  | $ | 115.35 |  |  |  |
Canceled or expired | (87,260 | ) |  | $ | 222.00 |  |  |  |
Outstanding at December 31, 2017 | 1,933,713 |  |  | $ | 207.10 |  |  | 1,375,844 |
Granted | 204,250 |  |  | $ | 276.64 |  |  |  |
Exercised | (931,929 | ) |  | $ | 193.68 |  |  |  |
Canceled or expired | (72,931 | ) |  | $ | 226.48 |  |  |  |
Outstanding at December 31, 2018 | 1,133,103 |  |  | $ | 229.42 |  |  | 581,534 |
Information about stock options excercised | The following table summarizes information about stock options (in millions of dollars):
|  | For the years ended December 31,
|  | 2018 |  | 2017 |  | 2016
Fair value of options exercised |  | $ | 38 |  |  | $ | 11 |  |  | $ | 8 |
Total intrinsic value of options exercised |  | 102 |  |  | 47 |  |  | 36 |
Fair value of options vested |  | 8 |  |  | 24 |  |  | 15 |
Settlements of options exercised |  | 180 |  |  | 47 |  |  | 35 |
Schedule of Share-based Compensation, Shares Authorized under Stock Option Plans, by Exercise Price Range | Information about stock options outstanding and exercisable as of December 31, 2018, is as follows:
|  | Options Outstanding |  | Options Exercisable
|  |  |  | Weighted Average |  |  |  |  | Weighted Average |
Range of Exercise Prices |  | Number |  | Remaining Contractual Life |  | Exercise Price |  | Intrinsic Value (millions) |  | Number |  | Remaining Contractual Life |  | Exercise Price |  | Intrinsic Value (millions)
$72.14 - $204.01 |  | 184,435 |  |  | 2.23 years |  | $ | 152.28 |  |  | $ | 24 |  |  | 183,292 |  |  | 2.19 years |  | $ | 152.17 |  |  | $ | 24 |
$223.68 - $276.64 |  | 948,668 |  |  | 7.37 years |  | $ | 244.42 |  |  | 36 |  |  | 398,242 |  |  | 6.10 years |  | $ | 238.88 |  |  | 17 |
|  | 1,133,103 |  |  | 6.54 years |  | $ | 229.42 |  |  | $ | 60 |  |  | 581,534 |  |  | 4.87 years |  | $ | 211.55 |  |  | $ | 41 |
Assumptions used to determine fair value of options granted | The fair value of options granted in 2018, 2017 and 2016 used the following assumptions:
|  | For the years ended December 31,
|  | 2018 |  | 2017 |  | 2016
Risk-free interest rate |  | 2.6% |  | 2.0% |  | 1.4%
Expected life |  | 6 years |  | 6 years |  | 6 years
Expected volatility |  | 27.5% |  | 23.9% |  | 24.5%
Expected dividend yield |  | 1.9% |  | 2.1% |  | 2.0%

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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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