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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Cash flows from operating activities: |  |  |
Net earnings | $ 755 | $ 895 | $ 823
Provision for credit losses | 22 | 12 | 7
Deferred income taxes and tax uncertainties | (5) | 4 | 7
Depreciation and amortization | 182 | 229 | 257
Impairment of goodwill, intangibles and long lived assets | 187 | 123 | 156
Net losses (gains) from sales of assets and business divestitures | 106 | (6) | (6)
Stock-based compensation | 46 | 40 | 47
Subtotal | 538 | 402 | 468
Change in operating assets and liabilities |  |  |
Accounts receivable | (121) | (42) | (79)
Inventories | (158) | (106) | (129)
Prepaid expenses and other assets | (23) | (33) | (2)
Trade accounts payable | 80 | 32 | (51)
Accrued liabilities | 15 | (84) | 18
Income taxes – net | 24 | (3) | 36
Other non-current liabilities | 13 | (19) | (27)
Net cash provided by operating activities | 1,123 | 1,042 | 1,057
Cash flows from investing activities: |  |  |
Additions to property, buildings, equipment and intangibles | (197) | (221) | (239)
Net proceeds of business acquisitions, divestitures and sales of assets | 20 | 17 | 86
Other - net | (2) | 2 | (13)
Net cash used in investing activities | (179) | (202) | (166)
Cash flows from financing activities: |  |  |
Borrowings under lines of credit | 12 | 20 | 26
Payments against lines of credit | (65) | (15) | (31)
Proceeds from long-term debt | 1,584 | 0 | 0
Payments of long-term debt | (1,370) | (42) | (96)
Proceeds from stock options exercised | 70 | 49 | 181
Payments for employee taxes withheld from stock awards | (18) | (11) | (12)
Purchases of treasury stock | (601) | (700) | (425)
Cash dividends paid | (338) | (328) | (316)
Other – net | 0 | 4 | 3
Net cash used in financing activities | (726) | (1,023) | (670)
Exchange rate effect on cash and cash equivalents | 7 | 5 | (10)
Net change in cash and cash equivalents: | 225 | (178) | 211
Cash and cash equivalents at beginning of year | 360 | 538 | 327
Cash and cash equivalents at end of year | 585 | 360 | 538
Supplemental cash flow information: |  |  |
Cash payments for interest (net of amounts capitalized) | 94 | 84 | 86
Cash payments for income taxes | $ 180 | $ 322 | $ 229

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- Definition The aggregate amount of adjustments to net income or loss necessary to remove the effects of all items whose cash effects are investing or financing cash flows. The aggregate amount also includes all noncash expenses and income items which reduce or increase net income and are thus added back or deducted when calculating cash provided by or used in operating activities. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3602-108585 + Details
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