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STOCK INCENTIVE PLANS
 12 Months Ended
Dec. 31, 2019
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 employees and executives, which include restricted stock units (RSUs), non-qualified stock options, performance shares and deferred stock units. As of December 31, 2019, there were 2.3 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 $40 million, $47 million, and $33 million in 2019, 2018 and 2017, respectively, and was primarily comprised of RSUs. Related income tax benefits recognized in earnings were $15 million, $26 million, and $26 million in 2019, 2018 and 2017, respectively.

Restricted Stock Units
The Company awards RSUs to certain employees and executives. RSUs vest generally over periods from one to seven years from issuance. RSU expense for the years ended December 31, 2019, 2018 and 2017 was approximately $27 million, $23 million and $17 million, respectively. The following table summarizes RSU activity (in millions, except for share and per share amounts):
 
2019
 
2018
 
2017
 
Shares
Weighted
Average Price Per Share
 
Shares
Weighted
Average Price Per Share
 
Shares
Weighted
Average Price Per Share
Beginning nonvested units
343,814

$
245.38

 
352,919

$
226.31

 
373,403

$
221.77

    Issued
96,823

$
299.25

 
141,775

$
284.98

 
129,378

$
222.53

    Canceled
(36,224
)
$
253.22

 
(56,393
)
$
245.08

 
(47,488
)
$
229.36

    Vested
(78,289
)
$
247.96

 
(94,487
)
$
233.75

 
(102,374
)
$
203.51

Ending nonvested units
326,124

$
259.88

 
343,814

$
245.38

 
352,919

$
226.31

Fair value of shares vested
$
19

 
 
$
22

 
 
$
21

 
 
 
 
 
 
 
 
 
 


At December 31, 2019 there was $45 million of total unrecognized compensation expense related to nonvested RSUs that the Company expects to recognize over a weighted average period of 2.1 years.

Stock Options
The Company issues stock options to certain employees and executives. Stock options are granted with an exercise price equal to the closing market price of the Company's stock on the day of the grant. The options generally expire 10 years from the grant date. Stock option expense for the years ended December 31, 2019, 2018 and 2017 was approximately $8 million, $9 million and $13 million, respectively. At December 31, 2019 there was $10.5 million of total unrecognized compensation expense related to nonvested option awards, which the Company expects to recognize over a weighted average period of 1.8 years.