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Supplemental Condensed Consolidating Financial Information - Condensed Consolidating Balance Sheet (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current assets:        
Cash and cash equivalents $ 2,819 $ 2,329 $ 1,539 $ 936
Investments 1,758 1,801    
Receivables 974 597    
Income taxes refundable 39 13    
Due from (to) affiliates 0 0    
Prepaid expenses and other current assets 131 192    
Derivative asset 267 374    
Total current assets 5,988 5,306    
Property, equipment, and capitalized software, net 454 393    
Deferred contract costs 86 81    
Goodwill and intangible assets, net 760 641    
Restricted investments 110 109    
Investment in subsidiaries, net 0 0    
Deferred income taxes 10 18    
Other assets 41 28    
Total assets 7,449 6,576 4,435  
Current liabilities:        
Medical claims and benefits payable 1,929 1,685 1,201 670
Amounts due government agencies 1,202 729    
Accounts payable and accrued liabilities 385 362    
Deferred revenue 315 223    
Current portion of long-term debt 472 449    
Derivative liability 267 374    
Total current liabilities 4,570 3,822    
Long-term debt 1,173 1,160    
Deferred income taxes 15 0    
Other long-term liabilities 42 37    
Total liabilities 5,800 5,019    
Total stockholders' equity 1,649 1,557    
Total liabilities and stockholders' equity 7,449 6,576    
Eliminations        
Current assets:        
Cash and cash equivalents 0 0 0 0
Investments 0 0    
Receivables 0 0    
Income taxes refundable 0 0    
Due from (to) affiliates 0 0    
Prepaid expenses and other current assets (5) (1)    
Derivative asset 0 0    
Total current assets (5) (1)    
Property, equipment, and capitalized software, net 0 0    
Deferred contract costs 0 0    
Goodwill and intangible assets, net 0 0    
Restricted investments 0 0    
Investment in subsidiaries, net (2,651) (2,206)    
Deferred income taxes 0 0    
Other assets (16) (16)    
Total assets (2,672) (2,223)    
Current liabilities:        
Medical claims and benefits payable 0 0    
Amounts due government agencies 0 0    
Accounts payable and accrued liabilities (5) 0    
Deferred revenue 0 0    
Current portion of long-term debt 0 0    
Derivative liability 0 0    
Total current liabilities (5) 0    
Long-term debt (16) (16)    
Deferred income taxes 0      
Other long-term liabilities 0 (1)    
Total liabilities (21) (17)    
Total stockholders' equity (2,651) (2,206)    
Total liabilities and stockholders' equity (2,672) (2,223)    
Parent Guarantor        
Current assets:        
Cash and cash equivalents 86 360 75 100
Investments 178 252    
Receivables 2 0    
Income taxes refundable 17 7    
Due from (to) affiliates 104 86    
Prepaid expenses and other current assets 58 46    
Derivative asset 267 374    
Total current assets 712 1,125    
Property, equipment, and capitalized software, net 301 267    
Goodwill and intangible assets, net 58 61    
Investment in subsidiaries, net 2,609 2,205    
Deferred income taxes 10 23    
Total assets 3,738 3,717    
Current liabilities:        
Medical claims and benefits payable 1 0    
Accounts payable and accrued liabilities 146 157    
Current portion of long-term debt 472 449    
Derivative liability 267 374    
Total current liabilities 886 980    
Deferred income taxes 11 0    
Other long-term liabilities 19 20    
Total liabilities 2,089 2,160    
Total stockholders' equity 1,649 1,557    
Total liabilities and stockholders' equity 3,738 3,717    
Parent Guarantor | Reportable Legal Entities        
Current assets:        
Cash and cash equivalents 86 360 75 100
Investments 178 252    
Receivables 2 0    
Income taxes refundable 17 7    
Due from (to) affiliates 104 86    
Prepaid expenses and other current assets 58 46    
Derivative asset 267 374    
Total current assets 712 1,125    
Property, equipment, and capitalized software, net 301 267    
Deferred contract costs 0 0    
Goodwill and intangible assets, net 58 61    
Restricted investments 0 0    
Investment in subsidiaries, net 2,609 2,205    
Deferred income taxes 10 23    
Other assets 48 36    
Total assets 3,738 3,717    
Current liabilities:        
Medical claims and benefits payable 1 0    
Amounts due government agencies 0 0    
Accounts payable and accrued liabilities 146 157    
Deferred revenue 0 0    
Current portion of long-term debt 472 449    
Derivative liability 267 374    
Total current liabilities 886 980    
Long-term debt 1,173 1,160    
Deferred income taxes 11      
Other long-term liabilities 19 20    
Total liabilities 2,089 2,160    
Total stockholders' equity 1,649 1,557    
Total liabilities and stockholders' equity 3,738 3,717    
Other Guarantors | Reportable Legal Entities        
Current assets:        
Cash and cash equivalents 38 42 15 9
Investments 0 0    
Receivables 78 79    
Income taxes refundable 4 3    
Due from (to) affiliates (19) (4)    
Prepaid expenses and other current assets 40 11    
Derivative asset 0 0    
Total current assets 141 131    
Property, equipment, and capitalized software, net 70 52    
Deferred contract costs 86 81    
Goodwill and intangible assets, net 223 246    
Restricted investments 0 0    
Investment in subsidiaries, net 42 1    
Deferred income taxes 0 (35)    
Other assets 4 2    
Total assets 566 478    
Current liabilities:        
Medical claims and benefits payable 0 3    
Amounts due government agencies 0 1    
Accounts payable and accrued liabilities 56 35    
Deferred revenue 40 34    
Current portion of long-term debt 0 0    
Derivative liability 0 0    
Total current liabilities 96 73    
Long-term debt 0 0    
Deferred income taxes 40      
Other long-term liabilities 3 2    
Total liabilities 139 75    
Total stockholders' equity 427 403    
Total liabilities and stockholders' equity 566 478    
Non-Guarantors | Reportable Legal Entities        
Current assets:        
Cash and cash equivalents 2,695 1,927 $ 1,449 $ 827
Investments 1,580 1,549    
Receivables 894 518    
Income taxes refundable 18 3    
Due from (to) affiliates (85) (82)    
Prepaid expenses and other current assets 38 136    
Derivative asset 0 0    
Total current assets 5,140 4,051    
Property, equipment, and capitalized software, net 83 74    
Deferred contract costs 0 0    
Goodwill and intangible assets, net 479 334    
Restricted investments 110 109    
Investment in subsidiaries, net 0 0    
Deferred income taxes 0 30    
Other assets 5 6    
Total assets 5,817 4,604    
Current liabilities:        
Medical claims and benefits payable 1,928 1,682    
Amounts due government agencies 1,202 728    
Accounts payable and accrued liabilities 188 170    
Deferred revenue 275 189    
Current portion of long-term debt 0 0    
Derivative liability 0 0    
Total current liabilities 3,593 2,769    
Long-term debt 16 16    
Deferred income taxes (36)      
Other long-term liabilities 20 16    
Total liabilities 3,593 2,801    
Total stockholders' equity 2,224 1,803    
Total liabilities and stockholders' equity $ 5,817 $ 4,604