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STOCK INCENTIVE PLANS | 12 Months Ended
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Dec. 31, 2022
STOCK INCENTIVE PLANS [Abstract] |
STOCK INCENTIVE PLANS | STOCK INCENTIVE PLANS The Company maintains stock incentive plans under which the Company may grant a variety of incentive awards to team members and executives, which include restricted stock units (RSUs), performance shares and deferred stock units. As of December 31, 2022, there were 1.5 million shares available for grant under the plans. When awards are exercised or settled, shares of the Company’s treasury stock are issued. Pretax stock-based compensation expense included in SG&A was $48 million, $42 million, and $46 million in 2022, 2021 and 2020, respectively, and was primarily comprised of RSUs. Related income tax benefits recognized in earnings were $19 million, $21 million, and $16 million in 2022, 2021 and 2020, respectively. Restricted Stock Units The Company awards RSUs to certain team members and executives. RSUs vest generally over periods from one to seven years from issuance. The RSU grant date fair value is based on the closing price of the Company's common stock on the last trading day preceding the date of the grant. RSU expense for the years ended December 31, 2022, 2021 and 2020 was approximately $34 million, $30 million and $32 million, respectively. The following table summarizes RSU activity (in millions of dollars, except for share and per share amounts):
| 2022 |  | 2021 |  | 2020
| Shares | Weighted Average Price Per Share |  | Shares | Weighted Average Price Per Share |  | Shares | Weighted Average Price Per Share
Beginning nonvested units | 202,321 |  | $ | 318.40 |  |  | 317,414 |  | $ | 259.67 |  |  | 326,124 |  | $ | 259.88 |
Issued | 96,940 |  | $ | 520.67 |  |  | 105,866 |  | $ | 406.17 |  |  | 140,815 |  | $ | 252.11 |
Canceled | (17,038) |  | $ | 345.30 |  |  | (36,134) |  | $ | 274.74 |  |  | (26,254) |  | $ | 257.56 |
Vested | (91,191) |  | $ | 336.99 |  |  | (184,825) |  | $ | 276.34 |  |  | (123,271) |  | $ | 252.05 |
Ending nonvested units | 191,032 |  | $ | 409.77 |  |  | 202,321 |  | $ | 318.40 |  |  | 317,414 |  | $ | 259.67 |
Fair value of shares vested | $ | 31 |  |  |  | $ | 51 |  |  |  | $ | 31 |  |
As of December 31, 2022, there was $55 million of total unrecognized compensation expense related to nonvested RSUs the Company expects to recognize over a weighted average period of 2.1 years.

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