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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
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)