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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash flows from operating activities: |  |  |
Net income | $ 788 | $ 824 | $ 696
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 309 | 270 | 249
Provision for doubtful accounts | 6 | 8 | 7
Deferred income tax provision | 73 | 9 | 37
Stock-based compensation expense | 61 | 79 | 69
Loss (gain) on disposition of business | 4 | 0 | (118)
Payment for debt extinguishment costs | 0 | 0 | 43
Other, net | 8 | (6) | (2)
Changes in operating assets and liabilities: |  |  |
Accounts receivable | (65) | 9 | (42)
Accounts payable and accrued expenses | (19) | (8) | 56
Income taxes payable | 4 | 16 | 42
Termination of interest rate swap agreements | 0 | 0 | 54
Other assets and liabilities, net | 31 | (26) | 25
Net cash provided by operating activities | 1,200 | 1,175 | 1,116
Cash flows from investing activities: |  |  |
Business acquisitions, net of cash acquired | (421) | (581) | (139)
Proceeds from disposition of business | 2 | 1 | 295
Capital expenditures | (383) | (252) | (293)
Decrease in investments and other assets | 1 | 2 | 10
Net cash used in investing activities | (801) | (830) | (127)
Cash flows from financing activities: |  |  |
Proceeds from borrowings | 2,090 | 205 | 1,869
Repayments of debt | (1,966) | (182) | (1,728)
Purchases of treasury stock | (322) | (465) | (590)
Exercise of stock options | 99 | 130 | 73
Employee payroll tax withholdings on stock issued under stock-based compensation plans | (21) | (23) | (10)
Dividends paid | (266) | (247) | (223)
Distributions to noncontrolling interest partners | (54) | (51) | (41)
Payment of debt extinguishment costs | 0 | 0 | (43)
Contributions from noncontrolling interest partners | 16 | 4 | 0
Other financing activities, net | 23 | 37 | (45)
Net cash used in financing activities | (401) | (592) | (738)
Net change in cash and cash equivalents and restricted cash | (2) | (247) | 251
Cash and cash equivalents and restricted cash, beginning of year | 137 | 384 | 133
Cash and cash equivalents and restricted cash, end of year | 135 | 137 | 384
Cash and cash equivalents and restricted cash, end of year | $ 137 | $ 384 | $ 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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