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v3.10.0.1

Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenue: |  |  |
Premium revenue | $ 17,612 | $ 18,854 | $ 16,445
Service revenue | 407 | 521 | 539
Premium tax revenue | 417 | 438 | 468
Health insurer fees reimbursed | 329 | 0 | 292
Investment income and other revenue | 125 | 70 | 38
Total revenue | 18,890 | 19,883 | 17,782
Operating expenses: |  |  |
General and administrative expenses | 1,333 | 1,594 | 1,393
Premium tax expenses | 417 | 438 | 468
Health insurer fees | 348 | 0 | 217
Depreciation and amortization | 99 | 137 | 139
Restructuring and separation costs | 46 | 234 | 0
Impairment losses | 0 | 470 | 0
Total operating expenses | 17,744 | 20,438 | 17,476
Loss on sales of subsidiaries, net of gain | (15) | 0 | 0
Operating income (loss) | 1,131 | (555) | 306
Interest expense | 115 | 118 | 101
Other expenses (income), net | 17 | (61) | 0
Total other expenses, net | 132 | 57 | 101
Income (loss) before income tax expense (benefit) | 999 | (612) | 205
Income tax expense (benefit) | 292 | (100) | 153
Net income (loss) | $ 707 | $ (512) | $ 52
Net income (loss) per share: |  |  |
Basic (in dollars per share) | $ 11.57 | $ (9.07) | $ 0.93
Diluted (in dollars per share) | $ 10.61 | $ (9.07) | $ 0.92
Weighted average shares outstanding: |  |  |
Basic (in shares) | 61.1 | 56.4 | 55.4
Diluted (in shares) | 66.6 | 56.4 | 56.2
Medical care costs |  |  |
Operating expenses: |  |  |
Cost of revenue | $ 15,137 | $ 17,073 | $ 14,774
Cost of service revenue |  |  |
Operating expenses: |  |  |
Cost of revenue | $ 364 | $ 492 | $ 485

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