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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