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Supplemental Condensed Consolidating Financial Information - Statements of Operations (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Revenue: |  |  |  |
Total revenue | $ 4,999 | $ 4,359 | $ 9,903 | $ 8,702
Expenses: |  |  |  |
Medical care costs | 4,491 | 3,594 | 8,602 | 7,182
Cost of service revenue | 124 | 116 | 246 | 243
General and administrative expenses | 405 | 351 | 844 | 691
Premium tax expenses | 114 | 109 | 225 | 218
Health insurer fee expenses | 0 | 50 | 0 | 108
Depreciation and amortization | 37 | 34 | 76 | 66
Impairment losses | 72 | 0 | 72 | 0
Restructuring and separation costs | 43 | 0 | 43 | 0
Total operating expenses | 5,286 | 4,254 | 10,108 | 8,508
Operating (loss) income | (287) | 105 | (205) | 194
Interest expense | 27 | 25 | 53 | 50
Other income, net | 0 | 0 | (75) | 0
(Loss) income before income tax (benefit) expense | (314) | 80 | (183) | 144
Income tax (benefit) expense | (84) | 47 | (30) | 87
Net (loss) income before equity in earnings of subsidiaries | (230) | 33 | (153) | 57
Equity in net earnings of subsidiaries | 0 | 0 | 0 | 0
Net (loss) income | (230) | 33 | (153) | 57
Eliminations |  |  |  |
Revenue: |  |  |  |
Total revenue | (293) | (260) | (635) | (510)
Expenses: |  |  |  |
Medical care costs | 0 | 0 | 0 | 0
Cost of service revenue | 0 | 0 | 0 | 0
General and administrative expenses | (293) | (260) | (635) | (510)
Premium tax expenses | 0 | 0 | 0 | 0
Health insurer fee expenses |  | 0 |  | 0
Depreciation and amortization | 0 | 0 | 0 | 0
Impairment losses | 0 |  | 0 |
Restructuring and separation costs | 0 |  | 0 |
Total operating expenses | (293) | (260) | (635) | (510)
Operating (loss) income | 0 | 0 | 0 | 0
Interest expense | 0 | 0 | 0 | 0
Other income, net |  |  | 0 |
(Loss) income before income tax (benefit) expense | 0 | 0 | 0 | 0
Income tax (benefit) expense | 0 | 0 | 0 | 0
Net (loss) income before equity in earnings of subsidiaries | 0 | 0 | 0 | 0
Equity in net earnings of subsidiaries | 241 | (47) | 197 | (82)
Net (loss) income | 241 | (47) | 197 | (82)
Parent Guarantor | Reportable Legal Entities |  |  |  |
Revenue: |  |  |  |
Total revenue | 289 | 261 | 630 | 512
Expenses: |  |  |  |
Medical care costs | 3 | 19 | 7 | 31
Cost of service revenue | 0 | 0 | 0 | 0
General and administrative expenses | 258 | 219 | 555 | 436
Premium tax expenses | 0 | 0 | 0 | 0
Health insurer fee expenses |  | 0 |  | 0
Depreciation and amortization | 25 | 23 | 52 | 45
Impairment losses | 0 |  | 0 |
Restructuring and separation costs | 43 |  | 43 |
Total operating expenses | 329 | 261 | 657 | 512
Operating (loss) income | (40) | 0 | (27) | 0
Interest expense | 27 | 25 | 53 | 50
Other income, net |  |  | (75) |
(Loss) income before income tax (benefit) expense | (67) | (25) | (5) | (50)
Income tax (benefit) expense | (14) | (12) | 17 | (28)
Net (loss) income before equity in earnings of subsidiaries | (53) | (13) | (22) | (22)
Equity in net earnings of subsidiaries | (177) | 46 | (131) | 79
Net (loss) income | (230) | 33 | (153) | 57
Other Guarantors | Reportable Legal Entities |  |  |  |
Revenue: |  |  |  |
Total revenue | 51 | 47 | 99 | 99
Expenses: |  |  |  |
Medical care costs | 0 | 0 | 0 | 0
Cost of service revenue | 43 | 23 | 85 | 88
General and administrative expenses | 7 | 24 | 14 | 9
Premium tax expenses | 0 | 0 | 0 | 0
Health insurer fee expenses |  | 0 |  | 0
Depreciation and amortization | 0 | 1 | 0 | 3
Impairment losses | 0 |  | 0 |
Restructuring and separation costs | 0 |  | 0 |
Total operating expenses | 50 | 48 | 99 | 100
Operating (loss) income | 1 | (1) | 0 | (1)
Interest expense | 0 | 0 | 0 | 0
Other income, net |  |  | 0 |
(Loss) income before income tax (benefit) expense | 1 | (1) | 0 | (1)
Income tax (benefit) expense | 0 | (1) | 0 | (1)
Net (loss) income before equity in earnings of subsidiaries | 1 | 0 | 0 | 0
Equity in net earnings of subsidiaries | (64) | 1 | (66) | 3
Net (loss) income | (63) | 1 | (66) | 3
Non-Guarantors | Reportable Legal Entities |  |  |  |
Revenue: |  |  |  |
Total revenue | 4,952 | 4,311 | 9,809 | 8,601
Expenses: |  |  |  |
Medical care costs | 4,488 | 3,575 | 8,595 | 7,151
Cost of service revenue | 81 | 93 | 161 | 155
General and administrative expenses | 433 | 368 | 910 | 756
Premium tax expenses | 114 | 109 | 225 | 218
Health insurer fee expenses |  | 50 |  | 108
Depreciation and amortization | 12 | 10 | 24 | 18
Impairment losses | 72 |  | 72 |
Restructuring and separation costs | 0 |  | 0 |
Total operating expenses | 5,200 | 4,205 | 9,987 | 8,406
Operating (loss) income | (248) | 106 | (178) | 195
Interest expense | 0 | 0 | 0 | 0
Other income, net |  |  | 0 |
(Loss) income before income tax (benefit) expense | (248) | 106 | (178) | 195
Income tax (benefit) expense | (70) | 60 | (47) | 116
Net (loss) income before equity in earnings of subsidiaries | (178) | 46 | (131) | 79
Equity in net earnings of subsidiaries | 0 | 0 | 0 | 0
Net (loss) income | $ (178) | $ 46 | $ (131) | $ 79

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