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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Revenue:        
Premium revenue $ 4,777 $ 4,191 $ 14,165 $ 12,215
Service revenue 130 133 390 408
Premium tax revenue 106 127 331 345
Health insurer fee revenue 0 85 0 251
Investment income and other revenue 18 10 48 29
Total revenue 5,031 4,546 14,934 13,248
Operating expenses:        
Medical care costs 4,220 3,748 12,822 10,930
Cost of service revenue 123 119 369 362
General and administrative expenses 383 343 1,227 1,034
Premium tax expenses 106 127 331 345
Health insurer fee expenses 0 55 0 163
Depreciation and amortization 33 36 109 102
Impairment losses 129 0 201 0
Restructuring and separation costs 118 0 161 0
Total operating expenses 5,112 4,428 15,220 12,936
Operating (loss) income (81) 118 (286) 312
Other expenses, net:        
Interest expense 32 26 85 76
Other income, net 0 0 (75) 0
Total other expenses, net 32 26 10 76
(Loss) income before income tax (benefit) expense (113) 92 (296) 236
Income tax (benefit) expense (16) 50 (46) 137
Net (loss) income $ (97) $ 42 $ (250) $ 99
Net (loss) income per share:        
Basic (in dollars per share) $ (1.70) $ 0.77 $ (4.44) $ 1.79
Diluted (in dollars per share) $ (1.70) $ 0.76 $ (4.44) $ 1.77