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Consolidated Statements of Operations - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue:      
Premium revenue $ 18,854 $ 16,445 $ 13,261
Service revenue 521 539 253
Premium tax revenue 438 468 397
Health insurer fees reimbursed 0 292 244
Investment income and other revenue 70 38 23
Total revenue 19,883 17,782 14,178
Operating expenses:      
Medical care costs 17,073 14,774 11,794
Cost of service revenue 492 485 193
General and administrative expenses 1,594 1,393 1,146
Premium tax expenses 438 468 397
Health insurer fees 0 217 157
Depreciation and amortization 137 139 104
Impairment losses 470 0 0
Restructuring and separation costs 234 0 0
Total operating expenses 20,438 17,476 13,791
Operating (loss) income (555) 306 387
Interest expense 118 101 66
Other income, net (61) 0 (1)
Total other expenses, net 57 101 65
(Loss) income before income tax (benefit) expense (612) 205 322
Income tax (benefit) expense (100) 153 179
Net (loss) income $ (512) $ 52 $ 143
Net (loss) income per share:      
Basic (in dollars per share) $ (9.07) $ 0.93 $ 2.75
Diluted (in dollars per share) $ (9.07) $ 0.92 $ 2.58
Weighted average shares outstanding:      
Basic (in shares) 56 55 52
Diluted (in shares) 56 56 56