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Supplemental Condensed Consolidating Financial Information - Condensed Consolidating Statements of Operations (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Revenue:                      
Total revenue $ 4,664 $ 4,697 $ 4,883 $ 4,646 $ 4,949 $ 5,031 $ 4,999 $ 4,904 $ 18,890 $ 19,883 $ 17,782
Expenses:                      
General and administrative expenses                 1,333 1,594 1,393
Premium tax expenses                 417 438 468
Health insurer fees                 348 0 217
Depreciation and amortization                 99 137 139
Restructuring and separation costs 8 5 8 25 73 118 43 0 46 234 0
Impairment losses         269 129 72 0 0 470 0
Total operating expenses                 17,744 20,438 17,476
Gain (loss) on sales of subsidiaries (52) 37 0 0         (15) 0 0
Operating income (loss)                 1,131 (555) 306
Interest expense                 115 118 101
Other expense                 (17) 61 0
Total other expenses, net                 (132) (57) (101)
Income (loss) before income tax expense (benefit)                 999 (612) 205
Income tax (benefit) expense                 292 (100) 153
Net loss before equity in net earnings (losses) of subsidiaries                 707 (512) 52
Equity in net earnings (losses) of subsidiaries                 0 0 0
Net income (loss) $ 201 $ 197 $ 202 $ 107 $ (262) $ (97) $ (230) $ 77 707 (512) 52
Parent Issuer                      
Revenue:                      
Total revenue                 1,155 1,333 1,078
Expenses:                      
General and administrative expenses                 1,007 1,082 899
Depreciation and amortization                 69 93 95
Restructuring and separation costs                 35 153 0
Impairment losses                 0 39 0
Total operating expenses                 1,119 1,383 1,067
Gain (loss) on sales of subsidiaries                 37 0 0
Operating income (loss)                 73 (50) 11
Interest expense                 114 117 101
Other expense                 (17) 61 0
Income tax (benefit) expense                 (14) 8 (24)
Net loss before equity in net earnings (losses) of subsidiaries                 (44) (114) (66)
Equity in net earnings (losses) of subsidiaries                 751 (398) 118
Net income (loss)                 707 (512) 52
Reportable Legal Entities | Parent Issuer                      
Revenue:                      
Total revenue                 1,155 1,333 1,078
Expenses:                      
General and administrative expenses                 1,007 1,082 899
Premium tax expenses                 0 0 0
Health insurer fees                 0   0
Depreciation and amortization                 69 93 95
Restructuring and separation costs                 35 153  
Impairment losses                   39  
Total operating expenses                 1,119 1,383 1,067
Gain (loss) on sales of subsidiaries                 37    
Operating income (loss)                 73 (50) 11
Interest expense                 114    
Other expense                 (17)    
Total other expenses, net                   (56) (101)
Income (loss) before income tax expense (benefit)                 (58) (106) (90)
Income tax (benefit) expense                 (14) 8 (24)
Net loss before equity in net earnings (losses) of subsidiaries                 (44) (114) (66)
Equity in net earnings (losses) of subsidiaries                 751 (398) 118
Net income (loss)                 707 (512) 52
Reportable Legal Entities | Other Guarantor                      
Revenue:                      
Total revenue                 3 2 0
Expenses:                      
General and administrative expenses                 4 2 2
Premium tax expenses                 0 0 0
Health insurer fees                 0   0
Depreciation and amortization                 0 0 0
Restructuring and separation costs                 0 0  
Impairment losses                   0  
Total operating expenses                 4 2 2
Gain (loss) on sales of subsidiaries                 (52)    
Operating income (loss)                 (53) 0 (2)
Interest expense                 0    
Other expense                 0    
Total other expenses, net                   0 0
Income (loss) before income tax expense (benefit)                 (53) 0 (2)
Income tax (benefit) expense                 (11) 0 (1)
Net loss before equity in net earnings (losses) of subsidiaries                 (42) 0 (1)
Equity in net earnings (losses) of subsidiaries                 (5) (164) 2
Net income (loss)                 (47) (164) 1
Reportable Legal Entities | Non-Guarantors                      
Revenue:                      
Total revenue                 18,884 19,904 17,786
Expenses:                      
General and administrative expenses                 1,474 1,865 1,573
Premium tax expenses                 417 438 468
Health insurer fees                 348   217
Depreciation and amortization                 30 44 44
Restructuring and separation costs                 11 81  
Impairment losses                   431  
Total operating expenses                 17,773 20,409 17,489
Gain (loss) on sales of subsidiaries                 0    
Operating income (loss)                 1,111 (505) 297
Interest expense                 1    
Other expense                 0    
Total other expenses, net                   (1) 0
Income (loss) before income tax expense (benefit)                 1,110 (506) 297
Income tax (benefit) expense                 317 (108) 178
Net loss before equity in net earnings (losses) of subsidiaries                 793 (398) 119
Equity in net earnings (losses) of subsidiaries                 0 8 0
Net income (loss)                 793 (390) 119
Eliminations                      
Revenue:                      
Total revenue                 (1,152) (1,356) (1,082)
Expenses:                      
General and administrative expenses                 (1,152) (1,355) (1,081)
Premium tax expenses                 0 0 0
Health insurer fees                 0   0
Depreciation and amortization                 0 0 0
Restructuring and separation costs                 0 0  
Impairment losses                   0  
Total operating expenses                 (1,152) (1,356) (1,082)
Gain (loss) on sales of subsidiaries                 0    
Operating income (loss)                 0 0 0
Interest expense                 0    
Other expense                 0    
Total other expenses, net                   0 0
Income (loss) before income tax expense (benefit)                 0 0 0
Income tax (benefit) expense                 0 0 0
Net loss before equity in net earnings (losses) of subsidiaries                 0 0 0
Equity in net earnings (losses) of subsidiaries                 (746) 554 (120)
Net income (loss)                 (746) 554 (120)
Medical care costs                      
Expenses:                      
Cost of revenue                 15,137 17,073 14,774
Medical care costs | Reportable Legal Entities | Parent Issuer                      
Expenses:                      
Cost of revenue                 8 16 73
Medical care costs | Reportable Legal Entities | Other Guarantor                      
Expenses:                      
Cost of revenue                 0 0 0
Medical care costs | Reportable Legal Entities | Non-Guarantors                      
Expenses:                      
Cost of revenue                 15,129 17,058 14,702
Medical care costs | Eliminations                      
Expenses:                      
Cost of revenue                 0 (1) (1)
Cost of service revenue                      
Expenses:                      
Cost of revenue                 364 492 485
Cost of service revenue | Reportable Legal Entities | Parent Issuer                      
Expenses:                      
Cost of revenue                 0 0 0
Cost of service revenue | Reportable Legal Entities | Other Guarantor                      
Expenses:                      
Cost of revenue                 0 0 0
Cost of service revenue | Reportable Legal Entities | Non-Guarantors                      
Expenses:                      
Cost of revenue                 364 492 485
Cost of service revenue | Eliminations                      
Expenses:                      
Cost of revenue                 $ 0 $ 0 $ 0