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INCOME TAXES - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Deferred tax assets: |  |  |  |
Net operating losses (federal and state) | $ 3 | $ 3 |  |
Accrued expenses | 14 | 8 |  |
Accrued workers' compensation costs | 9 | 9 |  |
Deferred Tax Assets, Recovery Credit | 26 | 0 |  |
Deferred Tax Assets, Operating Lease Liabilities | 15 | 17 |  |
Stock based compensation | 3 | 3 |  |
Tax benefits relating to uncertain positions | 1 | 1 |  |
Tax credits (federal and state) | 8 | 7 |  |
Total | 79 | 48 |  |
Valuation allowance | (5) | (5) | $ (7) | $ (7)
Total deferred tax assets | 74 | 43 |  |
Deferred tax liabilities: |  |  |  |
Depreciation and amortization | (37) | (27) |  |
Deferred service revenues | (20) | (41) |  |
Prepaid commission expenses | (22) | (19) |  |
Operating lease right-of-use assets | (13) | (15) |  |
Other | (2) | (1) |  |
Total deferred tax liabilities | (94) | (103) |  |
Net deferred tax liabilities | $ (20) | $ (60) |  |

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