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Supplemental Condensed Consolidating Financial Information - Statements of Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Revenue:      
Total revenue $ 4,646 $ 4,904  
Expenses:      
Medical care costs 3,722 4,111  
Cost of service revenue 120 122  
General and administrative expenses 352 439  
Premium tax expenses 104 111  
Health insurer fees 75 0  
Depreciation and amortization 26 39  
Restructuring and separation costs 25 0 $ 234
Total operating expenses 4,424 4,822  
Operating income 222 82  
Interest expense 33 26  
Other expense (income), net 10 (75)  
Income before income tax expense 179 131  
Income tax expense 72 54  
Net income (losses) before equity in earnings (losses) of subsidiaries 107 77  
Equity in net earnings of subsidiaries 0 0  
Net income 107 77  
Eliminations      
Revenue:      
Total revenue (331) (342)  
Expenses:      
Medical care costs 0 0  
Cost of service revenue 0 0  
General and administrative expenses (331) (342)  
Premium tax expenses 0 0  
Health insurer fees 0    
Depreciation and amortization 0 0  
Restructuring and separation costs 0    
Total operating expenses (331) (342)  
Operating income 0 0  
Interest expense 0 0  
Other expense (income), net 0 0  
Income before income tax expense 0 0  
Income tax expense 0 0  
Net income (losses) before equity in earnings (losses) of subsidiaries 0 0  
Equity in net earnings of subsidiaries (138) (44)  
Net income (138) (44)  
Parent Guarantor | Reportable Legal Entities      
Revenue:      
Total revenue 333 341  
Expenses:      
Medical care costs 4 4  
Cost of service revenue 0 0  
General and administrative expenses 267 297  
Premium tax expenses 0 0  
Health insurer fees 0    
Depreciation and amortization 18 27  
Restructuring and separation costs 26    
Total operating expenses 315 328  
Operating income 18 13  
Interest expense 33 26  
Other expense (income), net 10 (75)  
Income before income tax expense (25) 62  
Income tax expense 9 31  
Net income (losses) before equity in earnings (losses) of subsidiaries (34) 31  
Equity in net earnings of subsidiaries 141 46  
Net income 107 77  
Other Guarantors | Reportable Legal Entities      
Revenue:      
Total revenue 52 48  
Expenses:      
Medical care costs 0 0  
Cost of service revenue 43 42  
General and administrative expenses 4 7  
Premium tax expenses 0 0  
Health insurer fees 0    
Depreciation and amortization 0 0  
Restructuring and separation costs 0    
Total operating expenses 47 49  
Operating income 5 (1)  
Interest expense 0 0  
Other expense (income), net 0 0  
Income before income tax expense 5 (1)  
Income tax expense 1 0  
Net income (losses) before equity in earnings (losses) of subsidiaries 4 (1)  
Equity in net earnings of subsidiaries (3) (2)  
Net income 1 (3)  
Non-Guarantors | Reportable Legal Entities      
Revenue:      
Total revenue 4,592 4,857  
Expenses:      
Medical care costs 3,718 4,107  
Cost of service revenue 77 80  
General and administrative expenses 412 477  
Premium tax expenses 104 111  
Health insurer fees 75    
Depreciation and amortization 8 12  
Restructuring and separation costs (1)    
Total operating expenses 4,393 4,787  
Operating income 199 70  
Interest expense 0 0  
Other expense (income), net 0 0  
Income before income tax expense 199 70  
Income tax expense 62 23  
Net income (losses) before equity in earnings (losses) of subsidiaries 137 47  
Equity in net earnings of subsidiaries 0 0  
Net income $ 137 $ 47