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Income Taxes - Tax Effects Of Temporary Differences Which Give Rise To Deferred Tax Assets And Liabilities (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Income Tax Disclosure [Abstract] |  |
Medical claims liability | $ 78 | $ 46
Nondeductible liabilities | 128 | 41
Net operating loss and tax credit carryforwards | 77 | 94
Compensation accruals | 109 | 129
Premium and trade receivables | 76 | 45
Other | 61 | 11
Deferred tax assets | 529 | 366
Valuation allowance | (53) | (81)
Net deferred tax assets | 476 | 285
Intangible assets | 343 | 342
Prepaid assets | 31 | 23
Fixed assets | 132 | 84
Investments in joint ventures | 27 | 20
Deferred revenue | 19 | 26
Other | 6 | 17
Deferred tax liabilities | 558 | 512
Deferred tax liabilities, net | $ (82) | $ (227)

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