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Consolidated Statements of Cash Flows - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash flows from operating activities: |  |  |
Net income | $ 7,842 | $ 8,394 | $ 1,979
Depreciation, amortization and other | 2,206 | 1,946 | 1,955
Stock-based compensation expense | 308 | 311 | 329
Deferred income taxes | (289) | (363) | (1,330)
Other items, net | 186 | (386) | (334)
Changes in operating assets and liabilities, net of acquisitions: |  |  |
Trade receivables, net | (504) | (378) | (58)
Inventories | (66) | (3) | 133
Other assets | 10 | 35 | (24)
Accounts payable | 164 | (143) | 424
Accrued income taxes, net | (585) | (361) | 523
Long-term tax liabilities | (146) | 258 | 6,681
Other liabilities | 396 | 1,214 | 231
Net cash provided by operating activities | 9,150 | 11,296 | 11,177
Cash flows from investing activities: |  |  |
Purchases of marketable securities | (9,394) | (18,741) | (33,607)
Proceeds from sales of marketable securities | 8,842 | 28,356 | 24,240
Proceeds from maturities of marketable securities | 20,548 | 5,412 | 6,174
Purchases of property, plant and equipment | (618) | (738) | (664)
Cash paid for acquisitions, net of cash acquired | (13,617) | 195 | (19)
Other | (52) | (145) | (148)
Net cash provided by (used in) investing activities | 5,709 | 14,339 | (4,024)
Cash flows from financing activities: |  |  |
Net proceeds from issuance of debt | 0 | 0 | 4,476
Repayment of debt | (4,514) | (1,121) | (4,405)
Repurchases of common stock | (7,702) | (17,794) | (3,160)
Dividends paid | (3,509) | (3,507) | (3,365)
Withholding taxes arising from shares withheld for share-based payments | (137) | (126) | (191)
Other | 95 | 58 | 51
Net cash used in financing activities | (15,767) | (22,490) | (6,594)
(Decrease) increase in cash and cash equivalents | (908) | 3,145 | 559
Cash and cash equivalents at beginning of year | 6,945 | 3,800 | 3,241
Cash and cash equivalents at end of year | $ 6,037 | $ 6,945 | $ 3,800

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