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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Significant components of deferred tax assets and liabilities |  |
Accrued expenses | $ 22 | $ 37
Reserve liabilities | 28 | 14
Other accrued medical costs | 5 | 5
Net operating losses | 13 | 7
Unrealized losses | 1 | 2
Unearned premiums | 27 | 21
Lease financing obligation | 38 | 35
Deferred compensation | 6 | 8
Tax credit carryover | 7 | 8
Valuation allowance | (16) | (9)
Total deferred income tax assets, net of valuation allowance | 131 | 128
Prepaid expenses | (9) | (9)
Depreciation and amortization | (104) | (83)
Basis in debt | (23) | (18)
Total deferred income tax liabilities | (136) | (110)
Net deferred income tax (liability) asset - long term | $ (5) |
Net deferred income tax (liability) asset - long term |  | $ 18

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