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CONSOLIDATED STATEMENTS OF INCOME - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Revenue:    
Premium revenue $ 4,648 $ 3,995
Service revenue 131 140
Premium tax revenue 111 109
Health insurer fee revenue 0 90
Investment income and other revenue 14 9
Total revenue 4,904 4,343
Operating expenses:    
Medical care costs 4,111 3,588
Cost of service revenue 122 127
General and administrative expenses 439 340
Premium tax expenses 111 109
Health insurer fee expenses 0 58
Depreciation and amortization 39 32
Total operating expenses 4,822 4,254
Operating income 82 89
Other (income) expenses, net:    
Interest expense 26 25
Other income, net (75) 0
Total other (income) expenses, net (49) 25
Income before income tax expense 131 64
Income tax expense 54 40
Net income $ 77 $ 24
Net income per share:    
Basic (in dollars per share) $ 1.38 $ 0.44
Diluted (in dollars per share) $ 1.37 $ 0.43