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Supplemental Condensed Consolidating Financial Information - Condensed Consolidating Statements of (Loss) Income (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenue:                      
Revenues $ 4,949 $ 5,031 $ 4,999 $ 4,904 $ 4,534 $ 4,546 $ 4,359 $ 4,343 $ 19,883 $ 17,782 $ 14,178
Operating expenses:                      
Medical care costs                 17,073 14,774 11,794
Cost of service revenue                 492 485 193
General and administrative expenses                 1,594 1,393 1,146
Premium tax expenses                 438 468 397
Health insurer fees                 0 217 157
Depreciation and amortization                 137 139 104
Impairment losses 269 129 72 0         470 0 0
Restructuring and separation costs 73 118 43 0         234 0 0
Total operating expenses                 20,438 17,476 13,791
Operating (loss) income                 (555) 306 387
Interest expense                 118 101 66
Other income, net                 57 101 65
Other income, net                 (61) 0 (1)
(Loss) income before income tax (benefit) expense                 (612) 205 322
Income tax expense (benefit)                 (100) 153 179
Net loss before equity in net income of subsidiaries                 (512) 52 143
Equity in net (loss) income of subsidiaries                 0 0 0
Net (loss) income $ (262) $ (97) $ (230) $ 77 $ (47) $ 42 $ 33 $ 24 (512) 52 143
Parent Guarantor                      
Revenue:                      
Revenues                 1,333 1,078 931
Operating expenses:                      
Medical care costs                 16 73 55
General and administrative expenses                 1,082 899 797
Depreciation and amortization                 93 95 82
Impairment losses                 39 0 0
Restructuring and separation costs                 153 0 0
Total operating expenses                 1,383 1,067 934
Operating (loss) income                 (50) 11 (3)
Interest expense                 117 101 66
Other income, net                 (61) 0 0
Income tax expense (benefit)                 8 (24) (21)
Net loss before equity in net income of subsidiaries                 (114) (66) (48)
Equity in net (loss) income of subsidiaries                 (398) 118 191
Net (loss) income                 (512) 52 143
Reportable Legal Entities | Parent Guarantor                      
Revenue:                      
Revenues                 1,333 1,078 931
Operating expenses:                      
Medical care costs                 16 73 55
Cost of service revenue                 0 0 0
General and administrative expenses                 1,082 899 797
Premium tax expenses                 0 0 0
Health insurer fees                   0 0
Depreciation and amortization                 93 95 82
Impairment losses                 39    
Restructuring and separation costs                 153    
Total operating expenses                 1,383 1,067 934
Operating (loss) income                 (50) 11 (3)
Interest expense                 117    
Other income, net                   101 66
Other income, net                 (61)    
(Loss) income before income tax (benefit) expense                 (106) (90) (69)
Income tax expense (benefit)                 8 (24) (21)
Net loss before equity in net income of subsidiaries                 (114) (66) (48)
Equity in net (loss) income of subsidiaries                 (398) 118 191
Net (loss) income                 (512) 52 143
Reportable Legal Entities | Other Guarantors                      
Revenue:                      
Revenues                 194 202 195
Operating expenses:                      
Medical care costs                 0 0 0
Cost of service revenue                 171 174 140
General and administrative expenses                 17 16 31
Premium tax expenses                 0 0 0
Health insurer fees                   0 0
Depreciation and amortization                 1 1 1
Impairment losses                 28    
Restructuring and separation costs                 8    
Total operating expenses                 225 191 172
Operating (loss) income                 (31) 11 23
Interest expense                 0    
Other income, net                   0 0
Other income, net                 0    
(Loss) income before income tax (benefit) expense                 (31) 11 23
Income tax expense (benefit)                 (21) 3 7
Net loss before equity in net income of subsidiaries                 (10) 8 16
Equity in net (loss) income of subsidiaries                 (156) 1 (1)
Net (loss) income                 (166) 9 15
Reportable Legal Entities | Non-Guarantors                      
Revenue:                      
Revenues                 19,712 17,584 13,980
Operating expenses:                      
Medical care costs                 17,058 14,702 11,740
Cost of service revenue                 321 311 53
General and administrative expenses                 1,850 1,559 1,245
Premium tax expenses                 438 468 397
Health insurer fees                   217 157
Depreciation and amortization                 43 43 21
Impairment losses                 403    
Restructuring and separation costs                 73    
Total operating expenses                 20,186 17,300 13,613
Operating (loss) income                 (474) 284 367
Interest expense                 1    
Other income, net                   0 (1)
Other income, net                 0    
(Loss) income before income tax (benefit) expense                 (475) 284 368
Income tax expense (benefit)                 (87) 174 193
Net loss before equity in net income of subsidiaries                 (388) 110 175
Equity in net (loss) income of subsidiaries                 0 0 0
Net (loss) income                 (388) 110 175
Eliminations                      
Revenue:                      
Revenues                 (1,356) (1,082) (928)
Operating expenses:                      
Medical care costs                 (1) (1) (1)
Cost of service revenue                 0 0 0
General and administrative expenses                 (1,355) (1,081) (927)
Premium tax expenses                 0 0 0
Health insurer fees                   0 0
Depreciation and amortization                 0 0 0
Impairment losses                 0    
Restructuring and separation costs                 0    
Total operating expenses                 (1,356) (1,082) (928)
Operating (loss) income                 0 0 0
Interest expense                 0    
Other income, net                   0 0
Other income, net                 0    
(Loss) income before income tax (benefit) expense                 0 0 0
Income tax expense (benefit)                 0 0 0
Net loss before equity in net income of subsidiaries                 0 0 0
Equity in net (loss) income of subsidiaries                 554 (119) (190)
Net (loss) income                 $ 554 $ (119) $ (190)