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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Operating activities    
Net income $ 164 $ 163
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 41 36
Noncash lease expense 14 0
Stock based compensation 29 31
Changes in operating assets and liabilities:    
Accounts receivable, net 5 12
Unbilled revenue, net (61) (3)
Prepaid expenses, net (17) (26)
Other assets (34) (54)
Accounts payable and other current liabilities (16) (18)
Client deposits (28) (17)
Accrued wages 53 34
Accrued health insurance costs, net 21 (7)
Accrued workers' compensation costs, net (16) (5)
Payroll taxes payable and other payroll withholdings (340) (616)
Operating lease liabilities (13) 0
Other liabilities (13) (6)
Net cash used in operating activities (211) (476)
Investing activities    
Purchases of marketable securities (109) (223)
Proceeds from sale and maturity of marketable securities 113 87
Acquisitions of property and equipment (34) (33)
Net cash used in investing activities (30) (169)
Financing activities    
Repurchase of common stock (84) (47)
Proceeds from issuance of common stock from employee stock purchase plan 4 3
Proceeds from issuance of common stock from exercised options 2 6
Awards effectively repurchased for required employee withholding taxes (14) (15)
Proceeds from issuance of notes payable, net 0 210
Payments for extinguishment of debt 0 (204)
Repayment of debt (17) (15)
Net cash used in financing activities (109) (62)
Net decrease in unrestricted and restricted cash and cash equivalents (350) (707)
Cash and cash equivalents, unrestricted and restricted:    
Beginning of period 1,349 1,738
End of period 999 1,031
Supplemental disclosures of cash flow information    
Interest paid 15 13
Income taxes paid, net 48 33
Supplemental schedule of noncash investing and financing activities    
Payable for purchase of property and equipment $ 4 $ 2