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Condensed Financial Information of Registrant - Condensed Balance Sheets (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current assets:        
Cash and cash equivalents $ 3,186 $ 2,819 $ 2,329 $ 1,539
Investments 2,524 1,758    
Restricted investments 169 0    
Receivables 871 974    
Income taxes refundable 54 39    
Due from affiliates 0 0    
Prepaid expenses and other current assets 185 131    
Derivative asset 522 267    
Total current assets 7,511 5,988    
Property, equipment, and capitalized software, net 342 454    
Goodwill and intangible assets, net 255 760 641  
Investments in subsidiaries 0 0    
Deferred income taxes 103 10    
Total assets 8,471 7,449 6,576  
Current liabilities:        
Medical claims and benefits payable 2,192 1,929 1,685 1,201
Accounts payable and accrued liabilities 366 385    
Current portion of long-term debt 653 472    
Derivative liability 522 267    
Total current liabilities 5,557 4,570    
Deferred income taxes 0 15    
Other long-term liabilities 61 42    
Total liabilities 7,134 5,800    
Stockholders’ equity:        
Common stock, $0.001 par value; 150 shares authorized; outstanding: 60 shares at December 31, 2017 and 57 shares at December 31, 2016 0 0    
Preferred stock, $0.001 par value; 20 shares authorized, no shares issued and outstanding 0 0    
Additional paid-in capital 1,044 841    
Accumulated other comprehensive loss (5) (2)    
Retained earnings 298 810    
Total stockholders’ equity 1,337 1,649    
Total liabilities and stockholders' equity 8,471 7,449    
Parent Company        
Current assets:        
Cash and cash equivalents 504 86 $ 360 $ 75
Investments 192 178    
Restricted investments 169 0    
Receivables 2 2    
Income taxes refundable 16 17    
Due from affiliates 148 104    
Prepaid expenses and other current assets 87 58    
Derivative asset 522 267    
Total current assets 1,640 712    
Property, equipment, and capitalized software, net 223 301    
Goodwill and intangible assets, net 15 58    
Investments in subsidiaries 2,306 2,609    
Deferred income taxes 17 10    
Advances to related parties and other assets 32 48    
Total assets 4,233 3,738    
Current liabilities:        
Medical claims and benefits payable 3 1    
Accounts payable and accrued liabilities 178 146    
Current portion of long-term debt 653 472    
Derivative liability 522 267    
Total current liabilities 1,356 886    
Senior notes 1,318 975    
Lease financing obligations 198 198    
Deferred income taxes 0 11    
Other long-term liabilities 24 19    
Total liabilities 2,896 2,089    
Stockholders’ equity:        
Common stock, $0.001 par value; 150 shares authorized; outstanding: 60 shares at December 31, 2017 and 57 shares at December 31, 2016 0 0    
Preferred stock, $0.001 par value; 20 shares authorized, no shares issued and outstanding 0 0    
Additional paid-in capital 1,044 841    
Accumulated other comprehensive loss (5) (2)    
Retained earnings 298 810    
Total stockholders’ equity 1,337 1,649    
Total liabilities and stockholders' equity $ 4,233 $ 3,738