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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Operating activities    
Net income $ 109 $ 112
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 27 24
Noncash lease expense 10 0
Stock-based compensation 20 19
Changes in operating assets and liabilities:    
Accounts receivable 3 11
Unbilled revenue (36) 35
Prepaid expenses 18 9
Other assets (30) (45)
Accounts payable and other current liabilities (11) (28)
Client deposits 10 (24)
Accrued wages 25 (28)
Accrued health insurance costs (13) (13)
Accrued workers' compensation costs 9 (8)
Payroll taxes payable and other payroll withholdings (256) (588)
Operating lease liabilities (9) 0
Other liabilities (2) (1)
Net cash used in operating activities (162) (543)
Investing activities    
Purchases of marketable securities (65) (203)
Proceeds from sale and maturity of marketable securities 65 63
Acquisitions of property and equipment (25) (26)
Net cash used in investing activities (25) (166)
Financing activities    
Repurchase of common stock (62) (30)
Proceeds from issuance of common stock from employee stock purchase plan 4 3
Proceeds from issuance of common stock from exercised options 2 5
Awards effectively repurchased for required employee withholding taxes (10) (10)
Proceeds from issuance of notes payable, net 0 210
Payments for extinguishment of debt 0 (204)
Repayment of debt (11) (10)
Net cash used in financing activities (77) (36)
Net decrease in unrestricted and restricted cash and cash equivalents (264) (745)
Cash and cash equivalents, unrestricted and restricted:    
Beginning of period 1,349 1,738
End of period 1,085 993
Supplemental disclosures of cash flow information    
Interest paid 9 8
Income taxes paid, net 33 24
Supplemental schedule of noncash investing and financing activities    
Payable for purchase of property and equipment $ 8 $ 2