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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Income Tax Disclosure [Abstract] |  |
Accrued expenses and reserve liabilities | $ 57 | $ 52
Other accrued medical costs | 23 | 15
Net operating losses | 13 | 11
Unearned premiums | 17 | 18
Lease financing obligation | 9 | 8
Tax credit carryover | 5 | 7
Other | 6 | 4
Valuation allowance | (10) | (17)
Total deferred income tax assets, net of valuation allowance | 120 | 98
Fixed assets and intangibles | (1) | (7)
Prepaid expenses | (13) | (10)
Unrealized gains and losses | 0 | (12)
Total deferred income tax liabilities | (14) | (29)
Net deferred income tax asset | $ 106 | $ 69

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