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Supplemental Condensed Consolidating Financial Information - Condensed Consolidating 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: |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ 17,782 | $ 14,178 | $ 9,667
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Medical care costs |  |  |  |  |  |  |  |  | 14,774 | 11,794 | 8,076
Cost of service revenue |  |  |  |  |  |  |  |  | 485 | 193 | 157
General and administrative expenses |  |  |  |  |  |  |  |  | 1,393 | 1,146 | 765
Premium tax expenses |  |  |  |  |  |  |  |  | 468 | 397 | 294
Health insurer fee expenses |  |  |  |  |  |  |  |  | 217 | 157 | 89
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
Total other expenses, net |  |  |  |  |  |  |  |  | 101 | 65 | 58
Income before income tax expense |  |  |  |  |  |  |  |  | 205 | 322 | 135
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
Eliminations |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | (1,139) | (977) | (733)
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Medical care costs |  |  |  |  |  |  |  |  | (58) | (50) | (31)
Cost of service revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
General and administrative expenses |  |  |  |  |  |  |  |  | (1,081) | (927) | (702)
Premium tax expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Health insurer fee expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  | 0 | 0 | 0
Total operating expenses |  |  |  |  |  |  |  |  | (1,139) | (977) | (733)
Operating income |  |  |  |  |  |  |  |  | 0 | 0 | 0
Interest expense |  |  |  |  |  |  |  |  | 0 |  |
Total other expenses, net |  |  |  |  |  |  |  |  |  | 0 | 0
Income before income tax expense |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net (loss) income before equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Equity in net earnings of subsidiaries |  |  |  |  |  |  |  |  | (119) | (190) | (89)
Net income |  |  |  |  |  |  |  |  | (119) | (190) | (89)
Parent Guarantor |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,078 | 931 | 706
Operating 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
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
Parent Guarantor | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,078 | 931 | 706
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Medical care costs |  |  |  |  |  |  |  |  | 73 | 55 | 46
Cost of service revenue |  |  |  |  |  |  |  |  | 0 | 0 | 0
General and administrative expenses |  |  |  |  |  |  |  |  | 899 | 797 | 583
Premium tax expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Health insurer fee expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  | 95 | 82 | 73
Total operating expenses |  |  |  |  |  |  |  |  | 1,067 | 934 | 702
Operating income |  |  |  |  |  |  |  |  | 11 | (3) | 4
Interest expense |  |  |  |  |  |  |  |  | 101 |  |
Total other expenses, net |  |  |  |  |  |  |  |  |  | 66 | 58
Income before income tax expense |  |  |  |  |  |  |  |  | (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
Other Guarantors | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 556 | 293 | 240
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Medical care costs |  |  |  |  |  |  |  |  | 54 | 36 | 27
Cost of service revenue |  |  |  |  |  |  |  |  | 443 | 184 | 157
General and administrative expenses |  |  |  |  |  |  |  |  | 48 | 41 | 29
Premium tax expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Health insurer fee expenses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Depreciation and amortization |  |  |  |  |  |  |  |  | 12 | 4 | 5
Total operating expenses |  |  |  |  |  |  |  |  | 557 | 265 | 218
Operating income |  |  |  |  |  |  |  |  | (1) | 28 | 22
Interest expense |  |  |  |  |  |  |  |  | 0 |  |
Total other expenses, net |  |  |  |  |  |  |  |  |  | 0 | 0
Income before income tax expense |  |  |  |  |  |  |  |  | (1) | 28 | 22
Income tax expense (benefit) |  |  |  |  |  |  |  |  | (4) | 9 | 8
Net (loss) income before equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 3 | 19 | 14
Equity in net earnings of subsidiaries |  |  |  |  |  |  |  |  | 1 | (1) | 0
Net income |  |  |  |  |  |  |  |  | 4 | 18 | 14
Non-Guarantors | Reportable Legal Entities |  |  |  |  |  |  |  |  |  |  |
Revenue: |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 17,287 | 13,931 | 9,454
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Medical care costs |  |  |  |  |  |  |  |  | 14,705 | 11,753 | 8,034
Cost of service revenue |  |  |  |  |  |  |  |  | 42 | 9 | 0
General and administrative expenses |  |  |  |  |  |  |  |  | 1,527 | 1,235 | 855
Premium tax expenses |  |  |  |  |  |  |  |  | 468 | 397 | 294
Health insurer fee expenses |  |  |  |  |  |  |  |  | 217 | 157 | 89
Depreciation and amortization |  |  |  |  |  |  |  |  | 32 | 18 | 15
Total operating expenses |  |  |  |  |  |  |  |  | 16,991 | 13,569 | 9,287
Operating income |  |  |  |  |  |  |  |  | 296 | 362 | 167
Interest expense |  |  |  |  |  |  |  |  | 0 |  |
Total other expenses, net |  |  |  |  |  |  |  |  |  | (1) | 0
Income before income tax expense |  |  |  |  |  |  |  |  | 296 | 363 | 167
Income tax expense (benefit) |  |  |  |  |  |  |  |  | 181 | 191 | 92
Net (loss) income before equity in earnings of subsidiaries |  |  |  |  |  |  |  |  | 115 | 172 | 75
Equity in net earnings of subsidiaries |  |  |  |  |  |  |  |  | 0 | 0 | 0
Net income |  |  |  |  |  |  |  |  | $ 115 | $ 172 | $ 75

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