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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Cash flows from operating activities: |  |  |
Net income | $ 824 | $ 696 | $ 753
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 270 | 249 | 304
Provision for doubtful accounts | 315 | 308 | 297
Deferred income tax provision | 9 | 37 | 112
Stock-based compensation expense | 79 | 69 | 52
Gain on disposition of business | 0 | (118) | (334)
Other, net | (6) | (6) | 6
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (298) | (343) | (262)
Accounts payable and accrued expenses | (8) | 56 | (24)
Income taxes payable | 16 | 42 | (41)
Termination of interest rate swap agreements | 0 | 54 | 0
Other assets and liabilities, net | (26) | 25 | (42)
Net cash provided by operating activities | 1,175 | 1,069 | 821
Cash flows from investing activities: |  |  |
Business acquisitions, net of cash acquired | (581) | (139) | (67)
Proceeds from disposition of business | 1 | 270 | 0
Escrow proceeds associated with disposition of business | 25 | 0 | 0
Capital expenditures | (252) | (293) | (263)
Investment in equity method investee | 0 | 0 | (33)
Decrease in investments and other assets | 2 | 10 | 1
Net cash used in investing activities | (805) | (152) | (362)
Cash flows from financing activities: |  |  |
Proceeds from borrowings | 205 | 1,869 | 2,453
Repayments of debt | (182) | (1,724) | (2,537)
Purchases of treasury stock | (465) | (590) | (224)
Exercise of stock options | 130 | 73 | 60
Employee payroll tax withholdings on stock issued under stock-based compensation plans | (23) | (10) | (7)
Dividends paid | (247) | (223) | (212)
Distributions to noncontrolling interests | (51) | (41) | (42)
Sale of noncontrolling interest in subsidiary | 4 | 0 | 63
Payment of deferred business acquisition consideration | (3) | 0 | (51)
Other financing activities, net | 40 | (45) | (21)
Net cash used in financing activities | (592) | (691) | (518)
Net change in cash and cash equivalents | (222) | 226 | (59)
Cash and cash equivalents, beginning of year | 359 | 133 | 192
Cash and cash equivalents, end of year | $ 137 | $ 359 | $ 133

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- Definition Amount of expense related to write-down of receivables to the amount expected to be collected. Includes, but is not limited to, accounts receivable and notes receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913815&loc=SL49130534-203044 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.5) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82913847&loc=SL49130543-203045 + Details
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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
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- Definition The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585 + Details
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