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v3.19.3.a.u2

Consolidated Statements of Cash Flows - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Operating Activities: |  |  |
Net income | $ 5,364 | $ 5,460 | $ 4,644
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation expense | 255 | 226 | 233
Amortization expense | 1,149 | 1,203 | 1,053
Stock-based compensation expense | 636 | 845 | 638
Deferred income taxes | (2,098) | 289 | (82)
Net gains from equity securities | (1,241) | (115) | 0
Up-front and milestone expense related to collaborative and other arrangements | 4,346 | 0 | 0
In-process research and development impairment | 800 | 820 | 0
Write-downs for slow moving and excess raw material and work in process inventory | 547 | 440 | 0
Other | 184 | 171 | 304
Changes in operating assets and liabilities: |  |  |
Accounts receivable, net | (218) | 480 | 754
Inventories | (95) | (310) | (253)
Prepaid expenses and other | (307) | 903 | 358
Accounts payable | (61) | (39) | (430)
Income taxes payable | 272 | (1,459) | 5,497
Accrued liabilities | (389) | (514) | (818)
Net cash provided by operating activities | 9,144 | 8,400 | 11,898
Investing Activities: |  |  |
Purchases of marketable debt securities | (30,455) | (10,233) | (23,314)
Proceeds from sales of marketable debt securities | 7,523 | 1,522 | 10,440
Proceeds from maturities of marketable debt securities | 22,398 | 24,336 | 7,821
Up-front and milestone payments related to collaborative and other arrangements | (4,301) | 0 | 0
Purchases of equity securities | (1,773) | (156) | 0
Acquisitions, net of cash acquired | 0 | 0 | (10,426)
Capital expenditures | (825) | (924) | (590)
Other | (384) | (190) | 0
Net cash (used in) provided by investing activities | (7,817) | 14,355 | (16,069)
Financing Activities: |  |  |
Proceeds from debt financing, net of issuance costs | 0 | 0 | 8,985
Proceeds from issuances of common stock | 209 | 289 | 234
Repurchases of common stock | (1,749) | (2,900) | (954)
Repayments of debt and other obligations | (2,750) | (6,250) | (1,811)
Payment of dividends | (3,222) | (2,971) | (2,731)
Other | (122) | (486) | (330)
Net cash (used in) provided by financing activities | (7,634) | (12,318) | 3,393
Effect of exchange rate changes on cash and cash equivalents | (2) | (85) | 137
Net change in cash and cash equivalents | (6,309) | 10,352 | (641)
Cash and cash equivalents at beginning of period | 17,940 | 7,588 | 8,229
Cash and cash equivalents at end of period | 11,631 | 17,940 | 7,588
Supplemental disclosure of cash flow information: |  |  |
Interest paid, net of amounts capitalized | 982 | 1,070 | 1,038
Income taxes paid | $ 1,793 | $ 3,198 | $ 3,342

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