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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue: |  |  |  |  |  |  |  |  |  |  |
Total revenue | $ 4,664 | $ 4,697 | $ 4,883 | $ 4,646 | $ 4,949 | $ 5,031 | $ 4,999 | $ 4,904 | $ 18,890 | $ 19,883 | $ 17,782
Expenses: |  |  |  |  |  |  |  |  |  |  |
General and administrative expenses |  |  |  |  |  |  |  |  | 1,333 | 1,594 | 1,393
Depreciation and amortization |  |  |  |  |  |  |  |  | 99 | 137 | 139
Impairment losses |  |  |  |  | 269 | 129 | 72 | 0 | 0 | 470 | 0
Restructuring and separation costs | 8 | 5 | 8 | 25 | 73 | 118 | 43 | 0 | 46 | 234 | 0
Total operating expenses |  |  |  |  |  |  |  |  | 17,744 | 20,438 | 17,476
Gain (loss) on sales of subsidiaries | (52) | 37 | 0 | 0 |  |  |  |  | (15) | 0 | 0
Operating income (loss) |  |  |  |  |  |  |  |  | 1,131 | (555) | 306
Interest expense |  |  |  |  |  |  |  |  | 115 | 118 | 101
Other expense (income) |  |  |  |  |  |  |  |  | 17 | (61) | 0
Income tax (benefit) expense |  |  |  |  |  |  |  |  | 292 | (100) | 153
Net loss before equity in net earnings (losses) of subsidiaries |  |  |  |  |  |  |  |  | 707 | (512) | 52
Equity in net earnings (losses) of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income (loss) | $ 201 | $ 197 | $ 202 | $ 107 | $ (262) | $ (97) | $ (230) | $ 77 | 707 | (512) | 52
Parent Company |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Investment income and other revenue |  |  |  |  |  |  |  |  | 17 | 16 | 16
Total revenue |  |  |  |  |  |  |  |  | 1,155 | 1,333 | 1,078
Expenses: |  |  |  |  |  |  |  |  |  |  |
Medical care costs |  |  |  |  |  |  |  |  | 8 | 16 | 73
General and administrative expenses |  |  |  |  |  |  |  |  | 1,007 | 1,082 | 899
Depreciation and amortization |  |  |  |  |  |  |  |  | 69 | 93 | 95
Impairment losses |  |  |  |  |  |  |  |  | 0 | 39 | 0
Restructuring and separation costs |  |  |  |  |  |  |  |  | 35 | 153 | 0
Total operating expenses |  |  |  |  |  |  |  |  | 1,119 | 1,383 | 1,067
Gain (loss) on sales of subsidiaries |  |  |  |  |  |  |  |  | 37 | 0 | 0
Operating income (loss) |  |  |  |  |  |  |  |  | 73 | (50) | 11
Interest expense |  |  |  |  |  |  |  |  | 114 | 117 | 101
Other expense (income) |  |  |  |  |  |  |  |  | 17 | (61) | 0
Loss before income tax (benefit) expense and equity in net earnings (losses) of subsidiaries |  |  |  |  |  |  |  |  | (58) | (106) | (90)
Income tax (benefit) expense |  |  |  |  |  |  |  |  | (14) | 8 | (24)
Net loss before equity in net earnings (losses) of subsidiaries |  |  |  |  |  |  |  |  | (44) | (114) | (66)
Equity in net earnings (losses) of subsidiaries |  |  |  |  |  |  |  |  | 751 | (398) | 118
Net income (loss) |  |  |  |  |  |  |  |  | 707 | (512) | 52
Management Fees | Parent Company |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Management fees |  |  |  |  |  |  |  |  | $ 1,138 | $ 1,317 | $ 1,062

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