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Income Taxes - Significant Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Net operating losses (federal and state) | $ 3 | $ 4
Accrued expenses | 8 | 6
Accrued workers' compensation costs | 9 | 8
Stock-based compensation | 8 | 8
Tax benefits relating to uncertain positions | 0 | 1
Tax credits (federal and state) | 7 | 9
Total | 35 | 36
Valuation allowance | (7) | (7)
Total deferred tax assets | 28 | 29
Deferred tax liabilities: |  |
Depreciation and amortization | (24) | (13)
Deferred service revenues | (62) | (79)
Prepaid health plan expenses | 0 | (3)
Prepaid commission expenses | (9) | 0
Total deferred tax liabilities | (95) | (95)
Net deferred tax liabilities | $ (67) | $ (66)

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