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STOCK-BASED COMPENSATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Restricted stock units |  |  |
Stock Options |  |  |
Unrecognized compensation cost | $ 11 | $ 17 | $ 15
Unrecognized compensation expense, recognition period | 2 years | 2 years | 2 years
Total market value (at the vesting date) of stock award shares | $ 28 | $ 20 | $ 8
Granted (in shares) | 205,000 | 621,000 | 670,000
Forfeited (in shares) | 32,000 | 50,000 | 29,000
Vested (in shares) | 532,000 | 351,000 | 142,000
Performance restricted stock units |  |  |
Stock Options |  |  |
Period for recognition | 3 years |  |
Stock options |  |  |
Stock Options |  |  |
Unrecognized compensation expense, recognition period | 2 years | 1 year | 2 years
Expiration period | 10 years |  |
Exercised | $ 26 | $ 1 | $ 5
Outstanding at the end of the period | 6 years | 5 years | 6 years
Total unrecognized compensation expense | $ 1 | $ 1 | $ 4
Long-term stock awards |  |  |
Stock Options |  |  |
Unrecognized compensation expense, recognition period |  | 1 year | 2 years
Total market value (at the vesting date) of stock award shares | $ 10 | $ 21 | $ 28
Forfeited (in shares) | 3,000 | 11,000 | 26,000
Vested (in shares) | 191,000 | 324,000 | 491,000
Total unrecognized compensation expense |  | $ 3 | $ 10
Phantom Share Units (PSUs) |  |  |
Stock Options |  |  |
Unrecognized compensation cost | $ 2 | 2 |
Total market value (at the vesting date) of stock award shares | $ 3 | $ 4 | $ 5
Granted (in shares) | 57,000 | 74,000 | 82,000
Recognized expense (income) related to valuation | $ 5 | $ 1 | $ 6
Cash paid to settle awards | $ 4 | $ 4 | $ 3
Stock Appreciation Rights (SARs) |  |  |
Stock Options |  |  |
Granted (in shares) | 22,000 | 0 | 0
2014 Plan |  |  |
Stock Options |  |  |
Common stock available for granting stock options and other long-term stock incentive awards (in shares) | 11,300,000 |  |
LTIP Program | Minimum |  |  |
Stock Options |  |  |
Award vesting rights, percentage | 0.00% |  |
LTIP Program | Maximum |  |  |
Stock Options |  |  |
Award vesting rights, percentage | 200.00% |  |
LTIP Program | Performance restricted stock units |  |  |
Stock Options |  |  |
Granted (in shares) | 99,000 | 92,000 | 85,000
Granted (in dollars per share) | $ 52 | $ 55 | $ 53
Shares issued during period (in shares) | 253,000 | 168,000 | 105,000
Forfeited (in shares) |  |  | 0
Vested (in shares) | 59,000 | 255,000 | 186,000

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