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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2023 | Sep. 30, 2022
Operating activities |  |
Net income | $ 308 | $ 307
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization of intangible assets | 53 | 48
Amortization of deferred costs | 31 | 26
Amortization of ROU asset, lease modification, impairment, and abandonment | 5 | 15
Stock based compensation | 43 | 46
Deferred income taxes | (2) | 1
Provision for doubtful accounts | 2 | 1
Losses and impairment on investments | 0 | 18
Losses from disposition of assets | 0 | 3
Other | 1 | 0
Changes in operating assets and liabilities: |  |
Accounts receivable, net | (4) | 10
Unbilled revenue, net | (29) | (38)
Prepaid expenses, net | (4) | 3
Other assets | (44) | (30)
Other payroll assets | (104) | (56)
Accounts payable and other liabilities | 9 | 5
Client deposits and other client liabilities | (33) | (43)
Accrued wages | 21 | 40
Accrued health insurance costs, net | 9 | (10)
Accrued workers' compensation costs, net | (9) | (5)
Payroll taxes payable and other payroll withholdings | (283) | (252)
Operating lease liabilities | (13) | (13)
Net cash provided by (used in) operating activities | (43) | 76
Investing activities |  |
Purchases of marketable securities | (226) | (337)
Proceeds from sale and maturity of marketable securities | 223 | 390
Acquisitions of property and equipment | (54) | (39)
Acquisition of subsidiary, net of cash acquired | 0 | (219)
Net cash used in investing activities | (57) | (205)
Financing activities |  |
Repurchase of common stock | (1,109) | (383)
Proceeds from issuance of common stock | 9 | 6
Proceeds from issuance of 2031 Notes | 400 | 0
Awards effectively repurchased for required employee withholding taxes | (14) | (15)
Proceeds from revolving credit agreement borrowings | 695 | 0
Payment of long-term financing fees and debt issuance costs | (9) |
Repayment of borrowings under revolving credit facility | (495) | 0
Net cash used in financing activities | (523) | (392)
Net decrease in cash and cash equivalents, unrestricted and restricted | (623) | (521)
Cash and cash equivalents, unrestricted and restricted: |  |
Beginning of period | 1,537 | 1,738
End of period | 914 | 1,217
Supplemental disclosures of cash flow information |  |
Interest paid | 21 | 18
Income taxes paid, net | 89 | 60
Supplemental schedule of noncash investing and financing activities |  |
Payable for purchase of property and equipment | 2 | 7
Acquisitions of subsidiaries paid in stock | $ 0 | $ 4

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