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Consolidated Balance Sheets - 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    
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    
Deferred contract costs 101 86    
Intangible assets, net 69 140    
Goodwill 186 620    
Restricted investments 119 110    
Deferred income taxes 103 10    
Other assets 40 41    
Total assets 8,471 7,449 6,576  
Current liabilities:        
Medical claims and benefits payable 2,192 1,929 $ 1,685 $ 1,201
Amounts due government agencies 1,542 1,202    
Accounts payable and accrued liabilities 366 385    
Deferred revenue 282 315    
Current portion of long-term debt 653 472    
Derivative liability 522 267    
Total current liabilities 5,557 4,570    
Long-term debt 1,318 975    
Lease financing obligations 198 198    
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