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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

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