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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, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue:                      
Total revenue $ 4,949 $ 5,031 $ 4,999 $ 4,904 $ 4,534 $ 4,546 $ 4,359 $ 4,343 $ 19,883 $ 17,782 $ 14,178
Expenses:                      
Medical care costs                 17,073 14,774 11,794
General and administrative expenses                 1,594 1,393 1,146
Depreciation and amortization                 137 139 104
Impairment losses 269 129 72 0         470 0 0
Restructuring and separation costs 73 118 43 0         234 0 0
Total operating expenses                 20,438 17,476 13,791
Operating (loss) income                 (555) 306 387
Interest expense                 118 101 66
Other income                 (61) 0 (1)
Income tax expense (benefit)                 (100) 153 179
Net loss before equity in net income of subsidiaries                 (512) 52 143
Equity in net (loss) income of subsidiaries                 0 0 0
Net (loss) income $ (262) $ (97) $ (230) $ 77 $ (47) $ 42 $ 33 $ 24 (512) 52 143
Parent Company                      
Revenue:                      
Management fees                 1,317 1,062 914
Investment income and other revenue                 16 16 17
Total revenue                 1,333 1,078 931
Expenses:                      
Medical care costs                 16 73 55
General and administrative expenses                 1,082 899 797
Depreciation and amortization                 93 95 82
Impairment losses                 39 0 0
Restructuring and separation costs                 153 0 0
Total operating expenses                 1,383 1,067 934
Operating (loss) income                 (50) 11 (3)
Interest expense                 117 101 66
Other income                 (61) 0 0
Loss before income taxes and equity in net income of subsidiaries                 (106) (90) (69)
Income tax expense (benefit)                 8 (24) (21)
Net loss before equity in net income of subsidiaries                 (114) (66) (48)
Equity in net (loss) income of subsidiaries                 (398) 118 191
Net (loss) income                 $ (512) $ 52 $ 143