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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Operating activities |  |
Net income | $ 91 | $ 63
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 15 | 18
Noncash lease expense | 4 | 0
Stock based compensation | 9 | 9
Changes in operating assets and liabilities: |  |
Accounts receivable, net | 0 | 1
Unbilled revenue, net | (95) | (9)
Prepaid expenses, net | (3) | (12)
Accounts payable and other current liabilities | 29 | 9
Client deposits | (6) | (19)
Accrued wages | 38 | 17
Accrued health insurance costs, net | (2) | 0
Accrued workers' compensation costs, net | 3 | (2)
Payroll taxes payable and other payroll withholdings | (334) | (180)
Operating lease liabilities | (5) | (4)
Other assets | (28) | (30)
Other liabilities | 2 | (3)
Net cash used in operating activities | (282) | (142)
Investing activities |  |
Purchases of marketable securities | (155) | (30)
Proceeds from sales and maturities of marketable securities | 67 | 31
Acquisitions of property and equipment | (6) | (12)
Net cash used in investing activities | (94) | (11)
Financing activities |  |
Repurchase of common stock | (40) | (38)
Proceeds from issuance of common stock | 0 | 1
Awards effectively repurchased for required employee withholding taxes | (3) | (4)
Proceeds from revolving credit agreement borrowings | 234 | 0
Repayment of debt | (6) | (6)
Net cash provided by (used in) financing activities | 185 | (47)
Net decrease in cash and cash equivalents, unrestricted and restricted | (191) | (200)
Cash and cash equivalents, unrestricted and restricted: |  |
Beginning of period | 1,456 | 1,349
End of period | 1,265 | 1,149
Supplemental disclosures of cash flow information |  |
Interest paid | 3 | 4
Income taxes paid, net | 1 | 1
Supplemental schedule of noncash investing and financing activities |  |
Payable for purchase of property and equipment | $ 1 | $ 5

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- Definition The cash inflow associated with the aggregate amount received by the entity through sale or maturity of marketable securities (held-to-maturity or available-for-sale) during the period. + References No definition available. + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition Amount of noncash expense for share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3602-108585 + Details
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- References No definition available. + Details
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