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INCOME TAXES - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Net operating losses (federal and state) | $ 3 | $ 3 |  |
Accrued expenses | 20 | 14 |  |
Accrued workers' compensation costs | 9 | 9 |  |
Recovery credit | 13 | 26 |  |
Operating lease liabilities | 13 | 15 |  |
Stock based compensation | 3 | 3 |  |
Tax benefits relating to uncertain positions | 1 | 1 |  |
Tax credits (federal and state) | 6 | 8 |  |
Total | 68 | 79 |  |
Valuation allowance | (5) | (5) | $ (5) | $ (7)
Total deferred tax assets | 63 | 74 |  |
Deferred tax liabilities: |  |  |  |
Depreciation and amortization | (37) | (37) |  |
Deferred service revenues | 0 | (20) |  |
Prepaid commission expenses | (24) | (22) |  |
Operating lease right-of-use assets | (10) | (13) |  |
Other | (1) | (2) |  |
Total deferred tax liabilities | (72) | (94) |  |
Net deferred tax liabilities | $ (9) | $ (20) |  |

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