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Supplemental Condensed Consolidating Financial Information - Statements of Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Revenue:                
Total revenue $ 4,697     $ 5,031     $ 14,226 $ 14,934
Expenses:                
General and administrative expenses 311     383     998 1,227
Premium tax expenses 110     106     320 331
Health insurer fees 87     0     261 0
Depreciation and amortization 25     33     76 109
Impairment losses 0     129     0 201
Restructuring and separation costs 5     118     38 161
Total operating expenses 4,439     5,112     13,404 15,220
Gain on sale of subsidiary 37     0     37 0
Operating income (loss) 295     (81)     859 (286)
Interest expense 26     32     91 85
Other expenses (income), net 10     0     25 (75)
Income (loss) before income tax expense (benefit) 259     (113)     743 (296)
Income tax expense (benefit) 62     (16)     237 (46)
Net loss before equity in net (losses) earnings of subsidiaries 197     (97)     506 (250)
Equity in net earnings of subsidiaries 0     0     0 0
Net income (loss) 197 $ 202 $ 107 (97) $ (230) $ 77 506 (250)
Eliminations                
Revenue:                
Total revenue (271)     (379)     (863) (1,014)
Expenses:                
General and administrative expenses (271)     (379)     (863) (1,014)
Premium tax expenses 0     0     0 0
Health insurer fees 0           0  
Depreciation and amortization 0     0     0 0
Impairment losses       0       0
Restructuring and separation costs 0     0     0 0
Total operating expenses (271)     (379)     (863) (1,014)
Gain on sale of subsidiary 0           0  
Operating income (loss) 0     0     0 0
Interest expense 0     0     0 0
Other expenses (income), net 0           0 0
Income (loss) before income tax expense (benefit) 0     0     0 0
Income tax expense (benefit) 0     0     0 0
Net loss before equity in net (losses) earnings of subsidiaries 0     0     0 0
Equity in net earnings of subsidiaries (167)     167     (554) 364
Net income (loss) (167)     167     (554) 364
Parent Guarantor | Reportable Legal Entities                
Revenue:                
Total revenue 273     380     867 1,010
Expenses:                
General and administrative expenses 243     244     762 799
Premium tax expenses 0     0     0 0
Health insurer fees 0           0  
Depreciation and amortization 17     23     53 75
Impairment losses       0       0
Restructuring and separation costs 3     77     28 120
Total operating expenses 252     347     839 1,004
Gain on sale of subsidiary 37           37  
Operating income (loss) 58     33     65 6
Interest expense 26     32     90 85
Other expenses (income), net 10           25 (75)
Income (loss) before income tax expense (benefit) 22     1     (50) (4)
Income tax expense (benefit) (6)     9     4 26
Net loss before equity in net (losses) earnings of subsidiaries 28     (8)     (54) (30)
Equity in net earnings of subsidiaries 169     (89)     560 (220)
Net income (loss) 197     (97)     506 (250)
Other Guarantors | Reportable Legal Entities                
Revenue:                
Total revenue 0     (1)     2 1
Expenses:                
General and administrative expenses 1     0     3 2
Premium tax expenses 0     0     0 0
Health insurer fees 0           0  
Depreciation and amortization 0     0     0 0
Impairment losses       0       0
Restructuring and separation costs 0     0     0 0
Total operating expenses 1     0     3 2
Gain on sale of subsidiary 0           0  
Operating income (loss) (1)     (1)     (1) (1)
Interest expense 0     0     0 0
Other expenses (income), net 0           0 0
Income (loss) before income tax expense (benefit) (1)     (1)     (1) (1)
Income tax expense (benefit) 0     (1)     0 (1)
Net loss before equity in net (losses) earnings of subsidiaries (1)     0     (1) 0
Equity in net earnings of subsidiaries (2)     (86)     (6) (152)
Net income (loss) (3)     (86)     (7) (152)
Non-Guarantors | Reportable Legal Entities                
Revenue:                
Total revenue 4,695     5,031     14,220 14,937
Expenses:                
General and administrative expenses 338     518     1,096 1,440
Premium tax expenses 110     106     320 331
Health insurer fees 87           261  
Depreciation and amortization 8     10     23 34
Impairment losses       129       201
Restructuring and separation costs 2     41     10 41
Total operating expenses 4,457     5,144     13,425 15,228
Gain on sale of subsidiary 0           0  
Operating income (loss) 238     (113)     795 (291)
Interest expense 0     0     1 0
Other expenses (income), net 0           0 0
Income (loss) before income tax expense (benefit) 238     (113)     794 (291)
Income tax expense (benefit) 68     (24)     233 (71)
Net loss before equity in net (losses) earnings of subsidiaries 170     (89)     561 (220)
Equity in net earnings of subsidiaries 0     8     0 8
Net income (loss) 170     (81)     561 (212)
Health Care, Premium                
Expenses:                
Cost of revenue 3,790     4,220     11,362 12,822
Health Care, Premium | Eliminations                
Expenses:                
Cost of revenue 0     0     0 0
Health Care, Premium | Parent Guarantor | Reportable Legal Entities                
Expenses:                
Cost of revenue (11)     3     (4) 10
Health Care, Premium | Other Guarantors | Reportable Legal Entities                
Expenses:                
Cost of revenue 0     0     0 0
Health Care, Premium | Non-Guarantors | Reportable Legal Entities                
Expenses:                
Cost of revenue 3,801     4,217     11,366 12,812
Technology Service                
Expenses:                
Cost of revenue 111     123     349 369
Technology Service | Eliminations                
Expenses:                
Cost of revenue 0     0     0 0
Technology Service | Parent Guarantor | Reportable Legal Entities                
Expenses:                
Cost of revenue 0     0     0 0
Technology Service | Other Guarantors | Reportable Legal Entities                
Expenses:                
Cost of revenue 0     0     0 0
Technology Service | Non-Guarantors | Reportable Legal Entities                
Expenses:                
Cost of revenue $ 111     $ 123     $ 349 $ 369