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Supplemental Condensed Consolidating Financial Information - Statements of Income (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Revenue:    
Total revenue $ 4,904 $ 4,343
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
Interest expense 26 25
Other income, net (75) 0
Income before income tax expense 131 64
Income tax expense 54 40
Net (loss) income before equity in earnings of subsidiaries 77 24
Equity in net earnings of subsidiaries 0 0
Net income 77 24
Eliminations    
Revenue:    
Total revenue (342) (250)
Expenses:    
Medical care costs 0 0
Cost of service revenue 0 0
General and administrative expenses (342) (250)
Premium tax expenses 0 0
Health insurer fee expenses   0
Depreciation and amortization 0 0
Total operating expenses (342) (250)
Operating income 0 0
Interest expense 0 0
Other income, net 0  
Income before income tax expense 0 0
Income tax expense 0 0
Net (loss) income before equity in earnings of subsidiaries 0 0
Equity in net earnings of subsidiaries (44) (35)
Net income (44) (35)
Parent Guarantor | Reportable Legal Entities    
Revenue:    
Total revenue 341 251
Expenses:    
Medical care costs 4 12
Cost of service revenue 0 0
General and administrative expenses 297 217
Premium tax expenses 0 0
Health insurer fee expenses   0
Depreciation and amortization 27 22
Total operating expenses 328 251
Operating income 13 0
Interest expense 26 25
Other income, net (75)  
Income before income tax expense 62 (25)
Income tax expense 31 (16)
Net (loss) income before equity in earnings of subsidiaries 31 (9)
Equity in net earnings of subsidiaries 46 33
Net income 77 24
Other Guarantors | Reportable Legal Entities    
Revenue:    
Total revenue 48 52
Expenses:    
Medical care costs 0 0
Cost of service revenue 42 65
General and administrative expenses 7 (15)
Premium tax expenses 0 0
Health insurer fee expenses   0
Depreciation and amortization 0 2
Total operating expenses 49 52
Operating income (1) 0
Interest expense 0 0
Other income, net 0  
Income before income tax expense (1) 0
Income tax expense 0 0
Net (loss) income before equity in earnings of subsidiaries (1) 0
Equity in net earnings of subsidiaries (2) 2
Net income (3) 2
Non-Guarantors | Reportable Legal Entities    
Revenue:    
Total revenue 4,857 4,290
Expenses:    
Medical care costs 4,107 3,576
Cost of service revenue 80 62
General and administrative expenses 477 388
Premium tax expenses 111 109
Health insurer fee expenses   58
Depreciation and amortization 12 8
Total operating expenses 4,787 4,201
Operating income 70 89
Interest expense 0 0
Other income, net 0  
Income before income tax expense 70 89
Income tax expense 23 56
Net (loss) income before equity in earnings of subsidiaries 47 33
Equity in net earnings of subsidiaries 0 0
Net income $ 47 $ 33