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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Revenue:    
Premium revenue $ 3,952 $ 4,323
Premium tax revenue 138 104
Health insurer fees reimbursed 0 61
Service revenue 0 134
Investment income and other revenue 29 24
Total revenue 4,119 4,646
Operating expenses:    
General and administrative expenses 302 352
Premium tax expenses 138 104
Health insurer fees 0 75
Depreciation and amortization 25 26
Restructuring costs 3 25
Total operating expenses 3,839 4,424
Operating income 280 222
Other expenses, net:    
Interest expense 23 33
Other (income) expenses, net (3) 10
Total other expenses, net 20 43
Income before income tax expense 260 179
Income tax expense 62 72
Net income $ 198 $ 107
Net income per share:    
Basic (in dollars per share) $ 3.19 $ 1.79
Diluted (in dollars per share) $ 2.99 $ 1.64
Health Care, Premium    
Operating expenses:    
Cost of revenue $ 3,371 $ 3,722
Technology Service    
Operating expenses:    
Cost of revenue $ 0 $ 120