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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Significant components of deferred tax assets and liabilities    
Accrued expenses $ 32 $ 15
Reserve liabilities 7 11
Other accrued medical costs 12 16
Net operating losses 16 27
Fixed assets and intangibles 30 23
Unearned premiums 9 19
Lease financing obligation 30 30
Tax credit carryover 12 15
Other 3 3
Valuation allowance (28) (41)
Total deferred income tax assets, net of valuation allowance 123 118
Prepaid expenses (6) (6)
Basis in debt 0 (9)
Total deferred income tax liabilities (6) (15)
Net deferred income tax asset $ 117 $ 103