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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Operating activities    
Net income $ 192 $ 217
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 45 32
Amortization of ROU 6 8
Accretion of discount rate on lease liabilities 1 1
Amortization of premium of investments 1 0
Stock based compensation 24 20
Changes in operating assets and liabilities:    
Accounts receivable, net 10 4
Unbilled revenue, net (100) (67)
Prepaid expenses, net (5) 2
Accounts payable and other current liabilities 29 69
Client deposits and other client liabilities (2) 102
Accrued wages 197 20
Accrued health insurance costs, net (17) (22)
Accrued workers' compensation costs, net (7) (2)
Payroll taxes payable and other payroll withholdings (523) (475)
Operating lease liabilities (6) (10)
Other assets (32) (32)
Other liabilities (3) 3
Net cash used in operating activities (190) (130)
Investing activities    
Purchases of marketable securities (267) (222)
Proceeds from sale and maturity of marketable securities 149 119
Acquisitions of property and equipment (17) (18)
Net cash used in investing activities (135) (121)
Financing activities    
Repurchase of common stock (74) (100)
Proceeds from Issuance of Common Stock 5 5
Awards effectively repurchased for required employee withholding taxes (9) (6)
Proceeds from revolving credit agreement borrowings 0 234
Payment of long-term financing fees (2) 0
Payment of debt issuance costs (7) 0
Proceeds from issuance of 2029 Notes 500 0
Repayment of debt (370) (11)
Net cash provided by financing activities 43 122
Net decrease in cash and cash equivalents, unrestricted and restricted (282) (129)
Cash and cash equivalents, unrestricted and restricted:    
Beginning of period 1,643 1,456
End of period 1,361 1,327
Supplemental disclosures of cash flow information    
Interest paid 2 7
Income taxes paid, net 45 6
Supplemental schedule of noncash investing and financing activities    
Payable for purchase of property and equipment $ 2 $ 2