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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Operating activities      
Net earnings $ 489 $ 762 $ 1,084
Adjustments to reconcile net earnings to net cash provided by operating activities:      
Depreciation and amortization 574 611 604
Mark-to-market pension and other postretirement benefit plans (gain) loss, net 240 143 99
Asset impairment charges 146 72 39
Early debt extinguishment costs 1 0 7
Gain from sale of assets 0 0 (4)
Gain from property insurance 0 0 (65)
Provision for (benefit from) deferred income taxes (111) 23 (51)
Changes in operating assets and liabilities, net of effect of acquisitions and divestitures:      
(Increase) decrease in trade receivables (31) 170 16
(Increase) decrease in inventories 291 (80) (224)
Increase (decrease) in trade payables (100) (27) 90
Pension and other postretirement contributions (in excess of) less than expenses (136) (119) (152)
Variable compensation (in excess of) less than expenses 87 38 55
Other items, net 5 (89) 45
Net cash provided by operating activities 1,455 1,504 1,543
Investing activities      
Additions to properties and equipment (383) (425) (528)
Proceeds from property insurance 0 0 65
Proceeds from sale of assets and businesses 0 0 5
Acquisitions, net of cash acquired (1) (48) (3)
Other items, net (10) (7) (2)
Net cash used in investing activities (394) (480) (463)
Financing activities      
Net increase (decrease) in commercial paper and other borrowings (121) (70) (146)
Proceeds from borrowings 249 460 1,604
Repayment of borrowings (435) (760) (1,774)
Dividends paid to stockholders (358) (343) (318)
Treasury stock purchases (60) (325) (400)
Other items, net 21 (5) (6)
Net cash used in financing activities (704) (1,043) (1,040)
Effect of exchange rate changes on cash and cash equivalents 3 (3) (5)
Net change in cash and cash equivalents 360 (22) 35
Cash and cash equivalents at beginning of period 204 226 191
Cash and cash equivalents at end of period $ 564 $ 204 $ 226