CONSOLIDATED BALANCE SHEETS - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Current assets:    
Cash and cash equivalents $ 213 $ 228
Investments 68 54
Restricted cash, cash equivalents and investments 1,180 942
Accounts receivable, net 9 11
Unbilled revenue, net 285 304
Prepaid expenses, net 52 48
Other current assets 64 59
Total current assets 1,871 1,646
Noncurrent assets:    
Restricted cash, cash equivalents and investments, noncurrent 212 187
Investments, noncurrent 125 135
Property, equipment and software, net 85 79
Operating lease right-of-use asset 55  
Goodwill 289 289
Other intangible assets, net 15 21
Other assets 96 78
Total assets 2,748 2,435
Current liabilities:    
Accounts payable and other current liabilities 31 45
Long-term debt 22 22
Client deposits 44 56
Accrued wages 391 352
Accrued health insurance costs, net 167 135
Accrued workers' compensation costs, net 61 67
Payroll tax liabilities and other payroll withholdings 901 729
Operating lease liabilities 17  
Insurance premiums and other payables 9 19
Total current liabilities 1,643 1,425
Noncurrent liabilities:    
Long-term debt, noncurrent 369 391
Accrued workers' compensation costs, noncurrent, net 144 158
Deferred taxes 61 68
Operating lease liabilities, noncurrent 48  
Other non-current liabilities 8 18
Total liabilities 2,273 2,060
Total stockholders' equity    
Preferred stock ($0.000025 par value per share; 20,000,000 shares authorized; no shares issued or outstanding at December 31, 2018 and 2017) 0 0
Common stock and additional paid - in capital ($0.000025 par value per share; 750,000,000 shares authorized; 70,596,559 and 69,818,392 shares issued and outstanding at December 31, 2018 and 2017, respectively) 694 641
Accumulated deficit (219) (266)
Total stockholders’ equity 475 375
Total liabilities & stockholders' equity $ 2,748 $ 2,435