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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Accrued expenses and reserve liabilities | $ 35 | $ 39
Other accrued medical costs | 11 | 12
Net operating losses | 13 | 16
Fixed assets and intangibles | 26 | 30
Unearned premiums | 11 | 9
Lease financing obligation | 5 | 30
Tax credit carryover | 11 | 12
Other | 0 | 3
Valuation allowance | (24) | (28)
Total deferred income tax assets, net of valuation allowance | 88 | 123
Prepaid expenses | (6) | (6)
Other | (3) | 0
Total deferred income tax liabilities | (9) | (6)
Net deferred income tax asset | $ 79 | $ 117

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