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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Stock-based compensation |  |  |
Pre-tax compensation expense | $ 43 | $ 31 | $ 25
Long-term stock awards |  |  |
Stock-based compensation |  |  |
Pre-tax compensation expense | 14 | 20 | 20
Stock options |  |  |
Stock-based compensation |  |  |
Pre-tax compensation expense | 7 | 4 | 3
Restricted stock units |  |  |
Stock-based compensation |  |  |
Pre-tax compensation expense | 13 | 0 | 0
Performance restricted stock units |  |  |
Stock-based compensation |  |  |
Pre-tax compensation expense | 5 | 3 | 4
Phantom stock awards and stock appreciation rights |  |  |
Stock-based compensation |  |  |
Pre-tax compensation expense | $ 4 | $ 4 | $ (2)

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