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Condensed Financial Information of Registrant - Condensed Statements of Income (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenue:                      
Total revenue                 $ 17,782 $ 14,178 $ 9,667
Expenses:                      
Medical care costs                 14,774 11,794 8,076
General and administrative expenses                 1,393 1,146 765
Depreciation and amortization                 139 104 93
Total operating expenses                 17,476 13,791 9,474
Operating income $ (6) $ 118 $ 105 $ 89 $ 76 $ 113 $ 116 $ 82 306 387 193
Interest expense                 101 66 57
Other expense, net                 0 (1) 1
Income tax expense (benefit)                 153 179 73
Net (loss) income before equity in earnings of subsidiaries                 52 143 62
Equity in net earnings of subsidiaries                 0 0 0
Net income $ (47) $ 42 $ 33 $ 24 $ 30 $ 46 $ 39 $ 28 52 143 62
Parent Company                      
Revenue:                      
Management fees                 1,062 914 692
Investment income and other revenue                 16 17 14
Total revenue                 1,078 931 706
Expenses:                      
Medical care costs                 73 55 46
General and administrative expenses                 899 797 583
Depreciation and amortization                 95 82 73
Total operating expenses                 1,067 934 702
Operating income                 11 (3) 4
Interest expense                 101 66 57
Other expense, net                 0 0 1
Loss before income taxes and equity in net income of subsidiaries                 (90) (69) (54)
Income tax expense (benefit)                 (24) (21) (27)
Net (loss) income before equity in earnings of subsidiaries                 (66) (48) (27)
Equity in net earnings of subsidiaries                 118 191 89
Net income                 $ 52 $ 143 $ 62