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STOCK-BASED COMPENSATION - Pre-tax Compensation Expense and the Related Income Tax Benefit (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stock-based compensation |  |  |
Pre-tax compensation expense | $ 31 | $ 25 | $ 34
Long-term stock awards |  |  |
Stock-based compensation |  |  |
Pre-tax compensation expense | 20 | 20 | 21
Stock Options |  |  |
Stock-based compensation |  |  |
Pre-tax compensation expense | 4 | 3 | 3
Restricted Stock Units (RSUs) |  |  |
Stock-based compensation |  |  |
Pre-tax compensation expense | 3 | 4 | 2
Phantom stock awards and stock appreciation rights |  |  |
Stock-based compensation |  |  |
Pre-tax compensation expense | $ 4 | $ (2) | $ 8

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