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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Operating activities    
Net income $ 112 $ 69
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 24 16
Stock-based compensation 19 14
Changes in operating assets and liabilities:    
Prepaid income taxes 2 28
Prepaid expenses and other current assets (23) (3)
Workers' compensation collateral receivable and other noncurrent assets (6) 5
Accounts payable and other current liabilities (14) 5
Accrued corporate wages (5) 7
Workers' compensation loss reserves and other noncurrent liabilities (4) (5)
Worksite employee related assets 4 43
Worksite employee related liabilities (652) (383)
Net cash used in operating activities (543) (204)
Investing activities    
Purchases of marketable securities (203) 0
Proceeds from sale of marketable securities 39 0
Proceeds from maturity of marketable securities 24 11
Acquisitions of property and equipment (26) (20)
Net cash used in investing activities (166) (9)
Financing activities    
Repurchase of common stock (30) (30)
Proceeds from issuance of common stock on exercised options 5 6
Proceeds from issuance of common stock on employee stock purchase plan 3 2
Awards effectively repurchased for required employee withholding taxes (10) (5)
Proceeds from issuance of notes payable, net 210 0
Payments for extinguishment of debt (204) 0
Repayment of notes payable (10) (18)
Net cash used in financing activities (36) (45)
Net decrease in cash and cash equivalents, unrestricted and restricted (745) (258)
Cash and cash equivalents, unrestricted and restricted:    
Beginning of period 1,738 1,233
End of period 993 975
Supplemental disclosures of cash flow information    
Interest paid 8 8
Income taxes paid, net 24 0
Supplemental schedule of noncash investing and financing activities    
Payable for purchase of property and equipment 2 2
Supplemental schedule of cash and cash equivalents    
Net increase (decrease) in unrestricted cash and cash equivalents (134) 50
Net decrease in restricted cash and cash equivalents $ (611) $ (308)