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STOCK INCENTIVE PLANS (Tables) | 12 Months Ended
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Dec. 31, 2020
STOCK INCENTIVE PLANS [Abstract] |
Activity for restricted stock units | The following table summarizes RSU activity (in millions, except for share and per share amounts):
| 2020 |  | 2019 |  | 2018
| Shares | Weighted Average Price Per Share |  | Shares | Weighted Average Price Per Share |  | Shares | Weighted Average Price Per Share
Beginning nonvested units | 326,124 |  | $ | 259.88 |  |  | 343,814 |  | $ | 245.38 |  |  | 352,919 |  | $ | 226.31 |
Issued | 140,815 |  | $ | 252.11 |  |  | 96,823 |  | $ | 299.25 |  |  | 141,775 |  | $ | 284.98 |
Canceled | (26,254) |  | $ | 257.56 |  |  | (36,224) |  | $ | 253.22 |  |  | (56,393) |  | $ | 245.08 |
Vested | (123,271) |  | $ | 252.05 |  |  | (78,289) |  | $ | 247.96 |  |  | (94,487) |  | $ | 233.75 |
Ending nonvested units | 317,414 |  | $ | 259.67 |  |  | 326,124 |  | $ | 259.88 |  |  | 343,814 |  | $ | 245.38 |
Fair value of shares vested | $ | 31 |  |  |  | $ | 19 |  |  |  | $ | 22 |  |

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- Definition Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + Details
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