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INCENTIVE PLANS - Summary of Stock Based Compensation Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Payment Arrangement [Abstract] |  |  |  |
Total stock-based compensation expense (included in selling and administrative expense) | $ 3 | $ 4 | $ 10 | $ 11
Income tax benefit (expense) related to stock-based compensation | $ 1 | $ 1 | $ 3 | $ 2

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- Definition Amount of tax benefit for recognition of expense of award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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