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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 | Mar. 31, 2020
Operating activities |  |
Net income | $ 101 | $ 91
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 19 | 15
Amortization of ROU | 3 | 4
Accretion of discount rate on lease liabilities | 1 | 0
Amortization of premium of investments | 1 | 0
Stock based compensation | 11 | 9
Changes in operating assets and liabilities: |  |
Accounts receivable, net | 13 | 0
Unbilled revenue, net | (94) | (95)
Prepaid expenses, net | 5 | (3)
Accounts payable and other current liabilities | 33 | 29
Client deposits and other client liabilities | 17 | (6)
Accrued wages | 179 | 38
Accrued health insurance costs, net | (7) | (2)
Accrued workers' compensation costs, net | 0 | 3
Payroll taxes payable and other payroll withholdings | (426) | (334)
Operating lease liabilities | (3) | (5)
Other assets | (24) | (28)
Other liabilities | (4) | 2
Net cash used in operating activities | (175) | (282)
Investing activities |  |
Purchases of marketable securities | (82) | (155)
Proceeds from sale and maturity of marketable securities | 84 | 67
Acquisitions of property and equipment | (5) | (6)
Net cash used in investing activities | (3) | (94)
Financing activities |  |
Repurchase of common stock | (60) | (40)
Awards effectively repurchased for required employee withholding taxes | (5) | (3)
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) | (6)
Net cash provided by financing activities | 56 | 185
Net decrease in cash and cash equivalents, unrestricted and restricted | (122) | (191)
Cash and cash equivalents, unrestricted and restricted: |  |
Beginning of period | 1,643 | 1,456
End of period | 1,521 | 1,265
Supplemental disclosures of cash flow information |  |
Interest paid | 2 | 3
Income taxes paid, net | 2 | 1
Supplemental schedule of noncash investing and financing activities |  |
Payable for purchase of property and equipment | $ 3 | $ 1

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