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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Revenue: |  |  |  |
Premium revenue | $ 4,740 | $ 4,029 | $ 9,388 | $ 8,024
Service revenue | 129 | 135 | 260 | 275
Premium tax revenue | 114 | 109 | 225 | 218
Health insurer fee revenue | 0 | 76 | 0 | 166
Investment income and other revenue | 16 | 10 | 30 | 19
Total revenue | 4,999 | 4,359 | 9,903 | 8,702
Operating 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
Other expenses (income), net: |  |  |  |
Interest expense | 27 | 25 | 53 | 50
Other income, net | 0 | 0 | (75) | 0
Total other expenses (income), net | 27 | 25 | (22) | 50
(Loss) income before income tax (benefit) expense | (314) | 80 | (183) | 144
Income tax (benefit) expense | (84) | 47 | (30) | 87
Net (loss) income | $ (230) | $ 33 | $ (153) | $ 57
Net (loss) income per share: |  |  |  |
Basic (in dollars per share) | $ (4.10) | $ 0.58 | $ (2.74) | $ 1.02
Diluted (in dollars per share) | $ (4.10) | $ 0.58 | $ (2.74) | $ 1.01

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