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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)