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Consolidated Statements of Income - USD ($)
shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Revenue:      
Premium revenue $ 16,392 $ 13,241 $ 9,023
Service revenue 539 253 210
Premium tax revenue 468 397 294
Health insurer fee revenue 345 264 120
Investment income and other revenue 38 23 20
Total revenue 17,782 14,178 9,667
Operating expenses:      
Medical care costs 14,774 11,794 8,076
Cost of service revenue 485 193 157
General and administrative expenses 1,393 1,146 765
Premium tax expenses 468 397 294
Health insurer fee expenses 217 157 89
Depreciation and amortization 139 104 93
Total operating expenses 17,476 13,791 9,474
Operating income 306 387 193
Interest expense 101 66 57
Other (income) expense, net 0 (1) 1
Total other expenses, net 101 65 58
Income before income tax expense 205 322 135
Income tax expense 153 179 73
Net income $ 52 $ 143 $ 62
Basic net income (loss) per share:      
Continuing operations (in dollars per share) $ 0.93 $ 2.75 $ 1.34
Discontinued operations (in dollars per share) 0.00 0.00 (0.01)
Basic net income per share (in dollars per share) 0.93 2.75 1.33
Diluted net income (loss) per share:      
Continuing operations (in dollars per share) 0.92 2.58 1.30
Discontinued operations (in dollars per share) 0.00 0.00 (0.01)
Diluted net income per share (in dollars per share) $ 0.92 $ 2.58 $ 1.29
Weighted average shares outstanding:      
Basic (in shares) 55 52 47
Diluted (in shares) 56 56 48