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STOCK COMPENSATION | 3 Months Ended
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Mar. 31, 2021
Share-based Payment Arrangement [Abstract] |
STOCK COMPENSATION | STOCK COMPENSATION Total stock based compensation expense for non-qualified stock options, restricted stock units ("RSU"), and the tax related benefit for the three months ended March 31, 2021 and 2020 were as follows:
|  |  |  | Three Months Ended
(in millions) |  |  |  |  |  | 2021 |  | 2020
Stock option expense |  |  |  |  |  | $ | 2 |  |  | $ | 1 |
RSU expense |  |  |  |  |  | 11 |  |  | 8 |
Total stock based compensation expense |  |  |  |  |  | $ | 13 |  |  | $ | 9 |
Related deferred income tax benefit |  |  |  |  |  | $ | 2 |  |  | $ | 1 |
For the three months ended March 31, 2021 and 2020, stock compensation expense was $13 million and $9 million respectively, and was recorded in Selling, general, and administrative expense in the Consolidated Statements of Operations.

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- Definition The entire disclosure for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 + Details
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