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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Revenue:        
Premium tax revenue $ 106 $ 114 $ 210 $ 225
Health insurer fees reimbursed 104 0 165 0
Investment income and other revenue 32 16 56 30
Total revenue 4,883 4,999 9,529 9,903
Operating expenses:        
General and administrative expenses 335 405 687 844
Premium tax expenses 106 114 210 225
Health insurer fees 99 0 174 0
Depreciation and amortization 25 37 51 76
Impairment losses 0 72 0 72
Restructuring and separation costs 8 43 33 43
Total operating expenses 4,541 5,286 8,965 10,108
Operating income (loss) 342 (287) 564 (205)
Other expenses (income), net:        
Interest expense 32 27 65 53
Other expense (income), net 5 0 15 (75)
Total other expenses (income), net 37 27 80 (22)
Income (loss) before income tax expense (benefit) 305 (314) 484 (183)
Income tax expense (benefit) 103 (84) 175 (30)
Net income (loss) $ 202 $ (230) $ 309 $ (153)
Net income (loss) per share:        
Basic (in dollars per share) $ 3.29 $ (4.10) $ 5.10 $ (2.74)
Diluted (in dollars per share) $ 3.02 $ (4.10) $ 4.68 $ (2.74)
Health Care, Premium        
Revenue:        
Revenue $ 4,514 $ 4,740 $ 8,837 $ 9,388
Operating expenses:        
Cost of revenue 3,850 4,491 7,572 8,602
Technology Service        
Revenue:        
Revenue 127 129 261 260
Operating expenses:        
Cost of revenue $ 118 $ 124 $ 238 $ 246