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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Cash flows from operating activities: |  |
Net income | $ 175 | $ 115
Adjustments to reconcile net income to net cash provided by operating activities: |  |
Depreciation and amortization | 62 | 62
Provision for doubtful accounts | 84 | 86
Deferred income tax provision | 11 | 8
Stock-based compensation expense | 17 | 18
Other, net | 1 | 1
Changes in operating assets and liabilities: |  |
Accounts receivable | (117) | (145)
Accounts payable and accrued expenses | (95) | (69)
Income taxes payable | 63 | 62
Other assets and liabilities, net | (5) | 15
Net cash provided by operating activities | 196 | 153
Cash flows from investing activities: |  |
Business acquisitions, net of cash acquired | (1) | (135)
Escrow proceeds associated with disposition of business | 25 | 0
Capital expenditures | (42) | (47)
Increase in investments and other assets | (4) | (8)
Net cash used in investing activities | (22) | (190)
Cash flows from financing activities: |  |
Proceeds from borrowings | 0 | 665
Repayments of debt | (2) | (453)
Purchases of treasury stock | (150) | (115)
Exercise of stock options | 46 | 7
Employee payroll tax withholdings on stock issued under stock-based compensation plans | (22) | (8)
Dividends paid | (62) | (55)
Distributions to noncontrolling interests | (9) | (9)
Other financing activities, net | 33 | 0
Net cash (used in) provided by financing activities | (166) | 32
Net change in cash and cash equivalents | 8 | (5)
Cash and cash equivalents, beginning of period | 359 | 133
Cash and cash equivalents, end of period | $ 367 | $ 128

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