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STOCK-BASED COMPENSATION - Performance Restricted Stock Units and Phantom Stock Awards (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Stock-based compensation |  |  |
Grants in period, intrinsic value (in dollars per share) |  | $ 47 |
Forfeited (in shares) |  | 11,100 |
Minimum | LTIP Program |  |  |
Stock-based compensation |  |  |
Award vesting rights, percentage | 0.00% |  |
Maximum | LTIP Program |  |  |
Stock-based compensation |  |  |
Award vesting rights, percentage | 200.00% |  |
Performance restricted stock units |  |  |
Stock-based compensation |  |  |
Period for recognition | 3 years |  |
Performance restricted stock units | LTIP Program |  |  |
Stock-based compensation |  |  |
Granted (in shares) | 85,360 | 133,390 | 126,680
Grants in period, intrinsic value (in dollars per share) | $ 53 | $ 34 | $ 39
Shares issued during period (in shares) | 104,757 | 151,724 |
Forfeited (in shares) | 0 | 10,680 | 15,600
Vested (in shares) | 186,304 |  |
Phantom Share Units (PSUs) |  |  |
Stock-based compensation |  |  |
Granted (in shares) | 82,160 | 82,630 | 79,500
Recognized expense (income) related to valuation | $ 6 | $ 4 | $ 4
Fair value of stock award granted | 5 | 3 | 3
Cash paid to settle awards | 3 | 3 | $ 3
Accrued compensation cost liability | 8 | 6 |
Unrecognized compensation cost | $ 3 | $ 4 |
Equivalent common shares | 0 | 0 |

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