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Supplemental Condensed Consolidating Financial Information - Balance Sheet (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Current assets:        
Cash and cash equivalents $ 3,729 $ 3,186 $ 3,198  
Investments 2,444 2,524    
Restricted investments 77 169    
Receivables 950 871    
Due from (to) affiliates 0 0    
Prepaid expenses and other current assets 411 239    
Derivative asset 585 522    
Total current assets 8,196 7,511    
Property, equipment, and capitalized software, net 318 342    
Goodwill and intangible assets, net 250 255    
Restricted investments 120 119    
Investment in subsidiaries, net 0 0    
Deferred income taxes 114 103    
Other assets 135 141    
Total assets 9,133 8,471    
Current liabilities:        
Medical claims and benefits payable 2,023 2,192 $ 1,926 $ 1,929
Amounts due government agencies 1,714 1,542    
Accounts payable and accrued liabilities 713 366    
Deferred revenue 404 282    
Current portion of long-term debt 566 653    
Derivative liability 585 522    
Total current liabilities 6,005 5,557    
Long-term debt 1,516 1,516    
Deferred income taxes 0 0    
Other long-term liabilities 59 61    
Total liabilities 7,580 7,134    
Total stockholders’ equity 1,553 1,337    
Total liabilities and stockholders' equity 9,133 8,471    
Eliminations        
Current assets:        
Cash and cash equivalents 0 0    
Investments 0 0    
Restricted investments 0 0    
Receivables 0 0    
Due from (to) affiliates 0 0    
Prepaid expenses and other current assets 0 (16)    
Derivative asset 0 0    
Total current assets 0 (16)    
Property, equipment, and capitalized software, net 0 0    
Goodwill and intangible assets, net 0 0    
Restricted investments 0 0    
Investment in subsidiaries, net (2,610) (2,388)    
Deferred income taxes (18) (15)    
Other assets (16) (1)    
Total assets (2,644) (2,420)    
Current liabilities:        
Medical claims and benefits payable 0 0    
Amounts due government agencies 0 0    
Accounts payable and accrued liabilities 0 0    
Deferred revenue 0 0    
Current portion of long-term debt 0 (16)    
Derivative liability 0 0    
Total current liabilities 0 (16)    
Long-term debt (16) 0    
Deferred income taxes (18) (15)    
Other long-term liabilities 0 (1)    
Total liabilities (34) (32)    
Total stockholders’ equity (2,610) (2,388)    
Total liabilities and stockholders' equity (2,644) (2,420)    
Parent Guarantor | Reportable Legal Entities        
Current assets:        
Cash and cash equivalents 307 504    
Investments 399 192    
Restricted investments 77 169    
Receivables 2 2    
Due from (to) affiliates 147 148    
Prepaid expenses and other current assets 60 103    
Derivative asset 585 522    
Total current assets 1,577 1,640    
Property, equipment, and capitalized software, net 206 223    
Goodwill and intangible assets, net 15 15    
Restricted investments 0 0    
Investment in subsidiaries, net 2,531 2,306    
Deferred income taxes 28 17    
Other assets 41 32    
Total assets 4,398 4,233    
Current liabilities:        
Medical claims and benefits payable 3 3    
Amounts due government agencies 0 0    
Accounts payable and accrued liabilities 151 178    
Deferred revenue 0 0    
Current portion of long-term debt 566 653    
Derivative liability 585 522    
Total current liabilities 1,305 1,356    
Long-term debt 1,516 1,516    
Deferred income taxes 0 0    
Other long-term liabilities 24 24    
Total liabilities 2,845 2,896    
Total stockholders’ equity 1,553 1,337    
Total liabilities and stockholders' equity 4,398 4,233    
Other Guarantors | Reportable Legal Entities        
Current assets:        
Cash and cash equivalents 27 28    
Investments 0 0    
Restricted investments 0 0    
Receivables 41 30    
Due from (to) affiliates (5) (6)    
Prepaid expenses and other current assets 8 14    
Derivative asset 0 0    
Total current assets 71 66    
Property, equipment, and capitalized software, net 30 33    
Goodwill and intangible assets, net 43 43    
Restricted investments 0 0    
Investment in subsidiaries, net 79 82    
Deferred income taxes 0 0    
Other assets 105 103    
Total assets 328 327    
Current liabilities:        
Medical claims and benefits payable 0 0    
Amounts due government agencies 1 1    
Accounts payable and accrued liabilities 40 40    
Deferred revenue 41 49    
Current portion of long-term debt 0 0    
Derivative liability 0 0    
Total current liabilities 82 90    
Long-term debt 0 0    
Deferred income taxes 18 15    
Other long-term liabilities 1 2    
Total liabilities 101 107    
Total stockholders’ equity 227 220    
Total liabilities and stockholders' equity 328 327    
Non-Guarantors | Reportable Legal Entities        
Current assets:        
Cash and cash equivalents 3,395 2,654    
Investments 2,045 2,332    
Restricted investments 0 0    
Receivables 907 839    
Due from (to) affiliates (142) (142)    
Prepaid expenses and other current assets 343 138    
Derivative asset 0 0    
Total current assets 6,548 5,821    
Property, equipment, and capitalized software, net 82 86    
Goodwill and intangible assets, net 192 197    
Restricted investments 120 119    
Investment in subsidiaries, net 0 0    
Deferred income taxes 104 101    
Other assets 5 7    
Total assets 7,051 6,331    
Current liabilities:        
Medical claims and benefits payable 2,020 2,189    
Amounts due government agencies 1,713 1,541    
Accounts payable and accrued liabilities 522 148    
Deferred revenue 363 233    
Current portion of long-term debt 0 16    
Derivative liability 0 0    
Total current liabilities 4,618 4,127    
Long-term debt 16 0    
Deferred income taxes 0 0    
Other long-term liabilities 34 36    
Total liabilities 4,668 4,163    
Total stockholders’ equity 2,383 2,168    
Total liabilities and stockholders' equity $ 7,051 $ 6,331